According to experiments in many years in Hebei Province, the research explored weed comprehensive control technology on millet fields in terms of application range, prevention rules, prevention object, agricultural c...According to experiments in many years in Hebei Province, the research explored weed comprehensive control technology on millet fields in terms of application range, prevention rules, prevention object, agricultural control, physical control, and chemical control and proposed specific methods and technological indices in order to provide technological references for comprehensive control on weeds of millet fields.展开更多
I developed a weeding-duration model for Sakhalin fir （Abies sachalinensis （Fr. Schmidt） Masters） plantations that employs a generalized linear model. The number of years following planting that weeding is necessa...I developed a weeding-duration model for Sakhalin fir （Abies sachalinensis （Fr. Schmidt） Masters） plantations that employs a generalized linear model. The number of years following planting that weeding is necessary is the response variable, and elevation, slope steepness, maximum snow depth, annual precipitation, geology, soil, site index, slope aspect, and vegetation type are explanatory variables. Among the explanatory variables, geology, soil, slope aspect, and vegetation type are categorical data. A Poisson distribution is assumed for the response variable, with a log-link function. Elevation, slope steepness, maximum snow depth, annual precipitation, site index, and vegetation type had a significant effect on weeding duration. Among the eight models with the smallest Akaike information criterion （AIC）, I chose the model with no multicollinearity among the explanatory variables. The weeding-duration model includes site index, maximum snow depth, slope steepness （angle） and vegetation type as explanatory variables; elevation and annual precipitation were not included in the selected model because of multicollinearity with maximum snow depth. This model is useful for cost-benefit analyses of afforestation or reforestation with Abies sachalinensis.展开更多
[Objective] The paper was to explore weed control measures in tobacco fields in Anshun City. [Method] Different treatments on weed control were conducted in tobacco fields in Anshun City, Guizhou Province, from 2017 t...[Objective] The paper was to explore weed control measures in tobacco fields in Anshun City. [Method] Different treatments on weed control were conducted in tobacco fields in Anshun City, Guizhou Province, from 2017 to 2019. [Result] Various treatments had no negative effect on tobacco plant growth in the field, and had different degrees of control effects on five dominant weeds, including Digitaria sanguinalis, Setaria viridis, Fagopyrum dibotrys, Commelina communis and Chenopodium album. White mulching film and 50% butralin·clomazone EC 160 m L/667 m^(2) + white mulching film had the worst performance, which had extremely significant or significant differences with other treatments. There was no sig-nificant difference among most treatments, and the overall effects were comprehensive(multi-factor) treatment > double factor treatment > single factor treatment. [Conclusion] Combination control is recommended in practical tobacco production.展开更多
The System of Rice Intensification (SRI) has been attributed to improvement in rice production with various attributes being accrued from application of the SRI Principles. The most notable are savings on water use an...The System of Rice Intensification (SRI) has been attributed to improvement in rice production with various attributes being accrued from application of the SRI Principles. The most notable are savings on water use and increase in yield. Alternate Wetting and Drying (AWD) has also paved way for mechanical weed control in paddy fields. One of the major constraints to adoption of SRI is the perceived increased labour input due to the careful transplanting and frequent weed control. This paper evaluates the effect of mechanization on labour input in SRI in comparison to the less mechanized farmer practice. In attempt to reduce drudgery in transplanting under SRI, the drum seeder was used to establish the rice crop by direct seeding. This was then followed by using SRI practices i.e. AWD and mechanical weeding. Direct seeding using a drum seeder was compared to transplanting in both SRI and the common farmer practice. Hand weeding was also evaluated and compared to mechanical weeding. Labour input cost was also compared to the income accrued from the yields. From the study, it was noted that direct seeding using the drum seeder reduced labour input by 97% compared to transplanting. This was possible in that in direct seeding, and there was no nursery preparation and management as in transplanting. The use of a mechanical weeder reduced labour input by 28.3% in relation to hand weeding. Labour input cost for SRI was cheaper (Kshs. 124,080 per hectare) compared to the common farmer practice (Kshs. 139,117.50 per hectare). There was more yield from the SRI practice (2.75 Ton/ha) compared to the common farmer practice (1.88 Ton/ha).展开更多
The experiment was conducted at agronomy farm of Sher-e-Bangla Agricultural University, Dhaka <span style="font-family:Verdana;">from</span><span style="font-family:;" "="&...The experiment was conducted at agronomy farm of Sher-e-Bangla Agricultural University, Dhaka <span style="font-family:Verdana;">from</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> November 2017 to April 2018 to investigate the influence of weeding regimes on the performance of white maize varieties. The experiment comprised two varieties </span><i><span style="font-family:Verdana;">viz</span></i><span style="font-family:Verdana;">. YANGNUO-3000 and PSC-121, designated as V</span><sub><span style="font-family:Verdana;">1</span></sub><span style="font-family:Verdana;"> and V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;"> respectively combined with four weed control treatments </span><i><span style="font-family:Verdana;">viz.</span></i><span style="font-family:Verdana;"> T</span><sub><span style="font-family:Verdana;">0</span></sub><span style="font-family:Verdana;"> = No weeding, T</span><sub><span style="font-family:Verdana;">1</span></sub></span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">= One hand weeding at 60 DAS</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">(days after sowing), T</span><sub><span style="font-family:Verdana;">2</span></sub></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">= two hand weeding at 40 DAS and 60 DAS and T</span><sub><span style="font-family:Verdana;">3</span></sub></span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">= Weed free after 40 DAS. The experiment was laid out in RCBD (factorial) with three replications. PSC-121 showed the superior performance in terms of plant height, leaf number plant</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">, number of grains cob</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> (468.75), 100 grains weight (35.0837 g), grain yield (8.28 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">), stover yield (6.56 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) and harvest index (55.58%) over YANGNUO-3000. In </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">case of weed control treatments, the highest plant height, leaf number plant</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">, number of grains cob</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> (464.54), 100 grains weight (37 g), grain yield (9.25 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) and stover yield (7.46 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;">) were reported from T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">. All the parameters studied were found lowest with T</span><sub><span style="font-family:Verdana;">0</span></sub><span style="font-family:Verdana;">. However, in terms of interaction, no single interaction was superior </span></span><span style="font-family:Verdana;">to</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> other alternatives. But in most of the cases V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> showed the highest values regarding the maximum plant height, leaf number plant</span></span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">, number of grains cob</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;"> (494.97) and 100 grains weight (38 g). V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> showed the highest grain yield (9.33 t ha</span></span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;">), whereas, V</span><sub><span style="font-family:Verdana;">1</span></sub><span style="font-family:Verdana;">T</span><sub><span style="font-family:Verdana;">0</span></sub><span style="font-family:Verdana;"> showed the lowest grain yield (5.49 t ha</span></span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">). The lowest weed density and weed biomass (12.17 no. m</span><sup><span style="font-family:Verdana;">-2</span></sup><span style="font-family:Verdana;"> and 4.33 g·m</span><sup><span style="font-family:Verdana;">-2</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;">) was recorded from T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">. The highest weed control efficiency (94.38%) was also recorded from T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">. In </span></span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">case of variety V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;"> showed better performance in terms of weed density, weed biomass and WCE (46.32%).</span></span>展开更多
This study quantified the effect of weeding frequency and weeding schedules on weeding operation time in a sugi(Cryptomeria japonica)plantation stand.A weeding operation time estimation model was developed;then the cu...This study quantified the effect of weeding frequency and weeding schedules on weeding operation time in a sugi(Cryptomeria japonica)plantation stand.A weeding operation time estimation model was developed;then the cumulative weeding operation time after six growing seasons was simulated using the developed model.The developed model included weed height,relative height of weeds to sugi,and initial planting density.The simulated cumulative weeding operation time decreased approximately 6%for each one-treatment decrease in weeding frequency.Under a three-treatment weeding frequency scenario,the simulated cumulative operation time when weeding was conducted during non-consecutive years was longer than that when weeding was conducted during three consecutive years.The results suggest that carrying out weeding treatment during consecutive years is the more effective for reduction of weeding costs.We conclude that weeding schedule as well as weeding frequency must be considered for reduction of weeding operation time.展开更多
Chemical weeding in dry direct seeding fields of single cropping middle-late rice was studied in Huida vegetable farm of Huizhou City in 2012. The main treatment was herbicide（ pretilachlor ＋ bensulfuron-methyl,Yang...Chemical weeding in dry direct seeding fields of single cropping middle-late rice was studied in Huida vegetable farm of Huizhou City in 2012. The main treatment was herbicide（ pretilachlor ＋ bensulfuron-methyl,Yangguo and butachlor）,and the sub-treatment was application method（ soil treatments,seedling treatment and integrated treatment）. The results showed that 80 g pretilachlor ＋ bensulfuron-methyl（ 36% pretilachlor ＋ 4% bensulfuron-methyl） diluted with 50 kg water could be sprayed or 200 g Yangguo（ 23. 9% butachlor ＋ 1. 1% bensulfuron-methyl） mixed with 15 kg sandy soil could be broadcasted per 667 m2 on the sowing day or the second day under moist condition of soil,which could effectively control weeds in dry direct seeding fields of single cropping middle-late rice.展开更多
It is well known that quackgrass is both very aggressive and persistent. In agriculture, many attempts have been made to eliminate this weed without success. Within the context of a sustainable agriculture, mechanical...It is well known that quackgrass is both very aggressive and persistent. In agriculture, many attempts have been made to eliminate this weed without success. Within the context of a sustainable agriculture, mechanical control of quackgrass represents an interesting alternative to chemical means. The use of a ＂C＂ shaped mounted tine cultivator, a rotary cross-harrow, and an ＂S＂ shaped trailed tine cultivator （alone or in combination） to control quackgrass in grassland was investigated. The rate of quackgrass present in each experimental plot was determined before and after the treatments using a one square meter quadrant. Also, the time required for each passage as well as the fuel consumption were computed. Results revealed that the fuel consumption and the time required by the ＂C＂ and ＂S＂ shaped tine cultivators to transport and expose the rhizomes to the sun on the soil surface highly depend on the quality of tillage during the first stubble passage. Also, subsequent tillage with the ＂C＂ shaped tine cultivator after a first passage with a rotary cross-harrow resulted in less fuel consumption and passage time. On the other hand, stubble and subsequent soil tillage with only the ＂C＂ shaped tine cultivator is the least successful method.展开更多
Weeds have a negative impact on agricultural production by competing with cultivated crops for resources and fostering conditions conducive to disease and insect pest dissemination.Hence,optimal weed management is of ...Weeds have a negative impact on agricultural production by competing with cultivated crops for resources and fostering conditions conducive to disease and insect pest dissemination.Hence,optimal weed management is of paramount importance for sustainable agricultural.In this study,the ability of four distinct green manure species to suppress weeds was determined in a field experiment conducted in Chongqing,Southwest China.After cultivating the green manure species,the weed density and diversity were monitored over the following year.The findings highlight a notable trend in the suppressive ability of green manures,with increased suppression observed from November to March,an optimal level observed from March to May,and a gradual decline observed thereafter.Poaceae(Lolium perenne L.)demonstrated the highest efficacy in suppressing weeds.The meta-analysis underscore the exceptional suppressive effects of poaceous green manures on weed as well and prove sustained planting for three or more consecutive years yielded superior weed suppression outcomes.Green manure had the most prominent inhibitory effect on poaceae weeds,followed by Polygonaceae and Caryophyllaceae.The field experiment also investigated the effect of green manures on weed community composition,they increased in the proportion of perennial weeds within these communities.This study offers valuable insights that can guide policymakers,agricultural experts,and farmers in devising effective weed management strategies.By highlighting the potential benefits of green manures and unraveling their nuanced impact,this study contributes to the arsenal of sustainable agricultural practices.展开更多
Accurate weed identification in farmland is crucial for enhancing intelligent weeding precision.This study focuses on weeds in maize seedling fields and builds an accurate identification model using the Faster-RCNN de...Accurate weed identification in farmland is crucial for enhancing intelligent weeding precision.This study focuses on weeds in maize seedling fields and builds an accurate identification model using the Faster-RCNN deep-learning algorithm.An image database is created,and the VGG-16 network extracts labeled datasets for weed feature extraction.By calculating random candidate region scores,a neural network training model is established to determine weed positions and types.This model achieves an average accuracy of 81.25%and an identification rate of 94.3%in weed identification.To test the model’s performance in the field,it is evaluated under different conditions,such as lighting,field of view,and occlusion.Occlusion has the most significant impact on the identification rate.Without occlusion,the precision is 94.4%,dropping to 79.2%when the occlusion rate exceeds 50%.However,adjusting the shooting angle can increase the precision to 97.1%.In real-world conditions,considering all factors,the weed identification precision is 94.3%.The results show that this technology is highly adaptable in the field with fast image detection.With GPU acceleration,the average detection speed per image is 50 milliseconds,and the video stream can reach 20 frames per second.This technology can adapt to complex environments,detect accurately,and has a short calculation time.It provides key support for automated mechanical weeding and holds great promise for practical applications in agricultural production.展开更多
[Objective] The aim was to provide scientific reference for the production of silage maize in correlated regions of Tibet.[Method] Effects of film mulching on the growth period,growth traits and yield of silage maize ...[Objective] The aim was to provide scientific reference for the production of silage maize in correlated regions of Tibet.[Method] Effects of film mulching on the growth period,growth traits and yield of silage maize and weed were analyzed.[Result] Under the treatment of film mulching,the growth period of silage maize could be advanced for 7-16 d; the plant length,stem diameter and leaf area were increased; and the grain output was increased by 75.9%.According to the market price of silage maize in 2008,22 500 Yuan/hm^2 was increased.There were 13 kinds of weeds in silage maize field,which belonged to 13 genera,8 families.Among them,6 kinds of weeds belonged to Gramineae,among which Echinochloa crusgalli and Setaria viridis were dominated in the weed communities.Plantago depressa,Eragrostis pilosa and Malva verticillata var.chinensis could be totally controlled by the film mulching; meanwhile the others could be also controlled in a certain degree except Echinochloa crusgalli.[Conclusion] The plastic mulching planting is worth popularizing for the developing of animal husbandry and the incoming of the local farmers in Tibet.展开更多
[Objective] Through the investigation of weeds in Coffea arabica orchads in NuJiang River basin, this study aimed to provide scientific guidance for the weed control and improving the ecological and economic benefits ...[Objective] Through the investigation of weeds in Coffea arabica orchads in NuJiang River basin, this study aimed to provide scientific guidance for the weed control and improving the ecological and economic benefits of the plantation of Cof- fea arabica. [Method] The types of weeds and the characteristics of weed occur- rence in Coffea arabica orchads in Nujiang River basin were investigated from July to August in 2012. [Result] The results showed that there were 69 types of weeds belonging to 21 families in Coffea arabica orchads. The predominant harmful types were shown as follows： Commelina nudiflora L. ＋ Leptochloa chinensis, Cyperus ro- tundus L. ＋ Bidens pilosa L. ＋ Eleusine indica, Imperata cylindrical ＋ Ageratum conyzoides L. ＋ Eupatorium odoratum L., Ageratum conyzoides L. ＋ Digitaria san- guinalis （L.） Scop. The preponderant weeds consisted mainly of 10 species, namely, Cyperus rotundus L., Commelina nudiflora L., Leptochloa chinensis, Digitaria san- guinalis （L.） Scop, Imperata cylindrical, Bidens pilosa L., Ageratum conyzoides L, E- upatorium odoratum L., Eleusine indica and Chenopodium serotinum L. [Conclusion] The result from this study is of great significance for the plantation of Coffea arabica in Nujiang River basin, as well as the control of weeds.展开更多
[Objective] The paper was to resolve the poor efficacy or phytotoxicity problems in promotion of herbicide monosulfuron plus propazine 44% WP. [Method] Using orthogonal test and Duncan＇s new multiple range statistica...[Objective] The paper was to resolve the poor efficacy or phytotoxicity problems in promotion of herbicide monosulfuron plus propazine 44% WP. [Method] Using orthogonal test and Duncan＇s new multiple range statistical analysis with four factors four levels and three factors two levels, the effects of factors such as herbi- cide dose, irrigation water volume, quality of soil preparation and soil moisture content on chemical control of monosulfuron plus propazine 44% WP against weeds and millet yield were compared in the test. [Result] Seven factors all had great impact on control effect of monosulfuron plus propazine 44% WP against weeds, of which her- bicide dose, irrigation water volume, quality of soil preparation and soil moisture content were the most important factors affecting millet yield. According to millet yield and economic benefit, the optimal scheme to ensure safe, efficient and economic control of monosulfuron plus propazine 44% WP against weeds was as follows： the dose of monosulfuron plus propazine 44% WP was 1 800 g/hm2, the soil was treat- ed after sowing and before seedling emergence; the soil should be smooth and sol- id; the soil moisture should reach 15%; the fields should not be irrigated after herbi- cide application, and the damage of weeds in millet fields could be effectively con- trolled within 45 d during high efficacy duration, especially the damage of dicotyledonous weeds. [Conclusion] The study provided useful information for comprehensive technology of weeds control and ensuring high yield and good harvest of millet.展开更多
Objective] The aim was to investigate the effects of Pb stress on seed germination and seedling growth of Chenopodium glaucum and Chenopodium serot-inum L. [Method] With C. glaucum and C. serotinum as the study object...Objective] The aim was to investigate the effects of Pb stress on seed germination and seedling growth of Chenopodium glaucum and Chenopodium serot-inum L. [Method] With C. glaucum and C. serotinum as the study objects, the ef-fects of different concentrations of Pb on their seed germination and seedling growth, as wel as on the leaf SOD, POD and CAT activity were studied primarily. [Result] The germination potential of both the two kinds of weed seeds increased first and then decreased with the increase of Pb concentration. The germination po-tential of C. serotinum and C. glaucum seeds reached the peak at Pb concentration of 25 and 50 mg/L, respectively. With the increase of Pb treatment concentration, the germination rate, germination index and vigor index of C. serotinum and C. glaucum seeds decreased, and their bud length and root length also reduced gradu-al y. ln overal , the leaf SOD, POD and CAT activity of C. glaucum and C. serot-inum_ seedlings increased first and then decreased with the increased treatment concentration of Pb. The leaf SOD and POD activity of C. glaucum and C. serot-inum seedlings reached the maximum at Pb concentration of 200 and 100 mg/L, respectively, and the leaf CAT activity reached the maximum at Pb concentration of 100 mg/L. [Conclusion] The two Chenopodium species had strong tolerance to Pb stress, and they could be used as alternative accumulator plants of soil Pb contami-nation.展开更多
[Objective] Study on the effects of rice-duck mutualism on weeds and insects pests and economic benefits of paddy field. [Method] Comparison of the incidence of weeds, sheath blight and insects pest under rice-duck mu...[Objective] Study on the effects of rice-duck mutualism on weeds and insects pests and economic benefits of paddy field. [Method] Comparison of the incidence of weeds, sheath blight and insects pest under rice-duck mutualism, conventional cultivation and control treatment, the yield and economic benefits were analyzed under the 3 treatments. [Result] Average occurrence of weeds in rice-duck mutualism group decreased by 2.33 and 52.0g ind/m^2 compared with that in conventional cultivation and control treatment ; the control rate of mutualism was up to 75% against rice hopper, but just between 25% -60% against rice leaf roller and Chilo suppressalis. The rates of diseased plant and diseased bell against rice sheath blight were higher and disease indices were lower compared with control group. The yield of mutualism group was identical with conventional cultivation, Which was greatly higher than that of control group. The results suggested an higher economic benefits and lower cost benefit ratio for rice-duck mutualism treatment. [Conclusion] Rice-duck mutualism gives birth to a positive effect to control the diseases, insect pests and weeds, as well as to economic benefits, providing basis on extension of rice-duck mutualism system.展开更多
[ Objective] The paper was to explore the control effects of 3 kinds of herbicides against weeds in dogbane （Apocynum venetum） field. [ Method ] Using haloxyfop-R-mithyl and quizalofop-ethyl EC specifically killing ...[ Objective] The paper was to explore the control effects of 3 kinds of herbicides against weeds in dogbane （Apocynum venetum） field. [ Method ] Using haloxyfop-R-mithyl and quizalofop-ethyl EC specifically killing monagenns gramineous weeds and chipton specifically killing dicotyledonous broad-leaf weeds, the control test against weeds in 2-year-old dogbane field was carried out. [ Result ] Haloxyfop-R-mithyl had good control effect against gramincous weeds, and its control effect against both barnyard weed （ Echinochloa crusgalli） and green bristleweed （ Setaria viridis ） was greater than 35.0% ; the control effects of quizalofop- ethyl EC against barnyard weed and green bristleweed were 14.8% and 28.6%, respectively; chipt0n had good control effect against Chenopodium album, and the control effect reached 30.8%. Moreover, 3 herbicides did not cause damage to dogbane. [ Conclusion] The study provide theoretical basis for completing cultivation technique of dogbane.展开更多
[Objective] The study aimed to investigate the early growth stage＇s response of invasive plant alligatorweed（Alternanthera philoxeroides） under salt stress.[Method] The alligatorweed was cultivated with four differ...[Objective] The study aimed to investigate the early growth stage＇s response of invasive plant alligatorweed（Alternanthera philoxeroides） under salt stress.[Method] The alligatorweed was cultivated with four different NaCl concentrations 0（control）, 100, 200, 300 mmol/L diluted in 1/2 Hoagland＇s solution at early stage.During the period, we measured the number of nodes and leaves, length, fresh weight, dry weight and water content of stems to determine the effect of salt on alligatorweed growth. [Result] Compared with control, the node number, leaf number,length, fresh weight and dry weight of the stems significantly changed in NaCl solution, and the difference was positively related to NaCl concentration. We concluded that middle and high concentrations of NaCl significantly inhibited the growth of alligatorweed, by suppressing the node number, leaf number, length, fresh weight and dry weight of the stems. Among them, the stem length and fresh weight were more sensitive to NaCl stress. [Conclusion] The present result is helpful to understand the alligatorweed＇s adaptability to saline environment, and also helpful to prevent its invasion in such environment.展开更多
In order to screen herbicides with ideal safety characteristics to control malignant weed nut grass in sugarcane field, 20% thifensulfuron methyl WP and 65% MCPA·ametryne·diuron WP were selected for the fiel...In order to screen herbicides with ideal safety characteristics to control malignant weed nut grass in sugarcane field, 20% thifensulfuron methyl WP and 65% MCPA·ametryne·diuron WP were selected for the field efficacy trial. The results showed that 20% thifensulfuron methyl WP and 65% MCPA·ametryne·diuron WP had good control effect on nut grass. The optimum dosage of 20% thifensulfuron methyl WP and 65% MCPA.ametryne-diuron WP was 1 125 g/hm^2 （effective ingredients 225 g） and 3 150 g/hm^2 （effective ingredients 2 047.5 g）, respectively. These two herbicides should be dissolved in 675 kg water per hectare and applied in the vigorous growth period of nut grass （height 10-15 cm） with oriented stem leaf spraying. The control effect after 15 days could be above 87.9%.展开更多
基金Supported by Special Fund for Agro-scientific Research in the Public Interest(20120304201)Hebei Province Key Technology Research and Development Program(09250307D)~~
文摘According to experiments in many years in Hebei Province, the research explored weed comprehensive control technology on millet fields in terms of application range, prevention rules, prevention object, agricultural control, physical control, and chemical control and proposed specific methods and technological indices in order to provide technological references for comprehensive control on weeds of millet fields.
文摘I developed a weeding-duration model for Sakhalin fir （Abies sachalinensis （Fr. Schmidt） Masters） plantations that employs a generalized linear model. The number of years following planting that weeding is necessary is the response variable, and elevation, slope steepness, maximum snow depth, annual precipitation, geology, soil, site index, slope aspect, and vegetation type are explanatory variables. Among the explanatory variables, geology, soil, slope aspect, and vegetation type are categorical data. A Poisson distribution is assumed for the response variable, with a log-link function. Elevation, slope steepness, maximum snow depth, annual precipitation, site index, and vegetation type had a significant effect on weeding duration. Among the eight models with the smallest Akaike information criterion （AIC）, I chose the model with no multicollinearity among the explanatory variables. The weeding-duration model includes site index, maximum snow depth, slope steepness （angle） and vegetation type as explanatory variables; elevation and annual precipitation were not included in the selected model because of multicollinearity with maximum snow depth. This model is useful for cost-benefit analyses of afforestation or reforestation with Abies sachalinensis.
文摘[Objective] The paper was to explore weed control measures in tobacco fields in Anshun City. [Method] Different treatments on weed control were conducted in tobacco fields in Anshun City, Guizhou Province, from 2017 to 2019. [Result] Various treatments had no negative effect on tobacco plant growth in the field, and had different degrees of control effects on five dominant weeds, including Digitaria sanguinalis, Setaria viridis, Fagopyrum dibotrys, Commelina communis and Chenopodium album. White mulching film and 50% butralin·clomazone EC 160 m L/667 m^(2) + white mulching film had the worst performance, which had extremely significant or significant differences with other treatments. There was no sig-nificant difference among most treatments, and the overall effects were comprehensive(multi-factor) treatment > double factor treatment > single factor treatment. [Conclusion] Combination control is recommended in practical tobacco production.
文摘The System of Rice Intensification (SRI) has been attributed to improvement in rice production with various attributes being accrued from application of the SRI Principles. The most notable are savings on water use and increase in yield. Alternate Wetting and Drying (AWD) has also paved way for mechanical weed control in paddy fields. One of the major constraints to adoption of SRI is the perceived increased labour input due to the careful transplanting and frequent weed control. This paper evaluates the effect of mechanization on labour input in SRI in comparison to the less mechanized farmer practice. In attempt to reduce drudgery in transplanting under SRI, the drum seeder was used to establish the rice crop by direct seeding. This was then followed by using SRI practices i.e. AWD and mechanical weeding. Direct seeding using a drum seeder was compared to transplanting in both SRI and the common farmer practice. Hand weeding was also evaluated and compared to mechanical weeding. Labour input cost was also compared to the income accrued from the yields. From the study, it was noted that direct seeding using the drum seeder reduced labour input by 97% compared to transplanting. This was possible in that in direct seeding, and there was no nursery preparation and management as in transplanting. The use of a mechanical weeder reduced labour input by 28.3% in relation to hand weeding. Labour input cost for SRI was cheaper (Kshs. 124,080 per hectare) compared to the common farmer practice (Kshs. 139,117.50 per hectare). There was more yield from the SRI practice (2.75 Ton/ha) compared to the common farmer practice (1.88 Ton/ha).
文摘The experiment was conducted at agronomy farm of Sher-e-Bangla Agricultural University, Dhaka <span style="font-family:Verdana;">from</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> November 2017 to April 2018 to investigate the influence of weeding regimes on the performance of white maize varieties. The experiment comprised two varieties </span><i><span style="font-family:Verdana;">viz</span></i><span style="font-family:Verdana;">. YANGNUO-3000 and PSC-121, designated as V</span><sub><span style="font-family:Verdana;">1</span></sub><span style="font-family:Verdana;"> and V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;"> respectively combined with four weed control treatments </span><i><span style="font-family:Verdana;">viz.</span></i><span style="font-family:Verdana;"> T</span><sub><span style="font-family:Verdana;">0</span></sub><span style="font-family:Verdana;"> = No weeding, T</span><sub><span style="font-family:Verdana;">1</span></sub></span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">= One hand weeding at 60 DAS</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">(days after sowing), T</span><sub><span style="font-family:Verdana;">2</span></sub></span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">= two hand weeding at 40 DAS and 60 DAS and T</span><sub><span style="font-family:Verdana;">3</span></sub></span><span style="font-family:;" "=""> </span><span style="font-family:Verdana;">= Weed free after 40 DAS. The experiment was laid out in RCBD (factorial) with three replications. PSC-121 showed the superior performance in terms of plant height, leaf number plant</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">, number of grains cob</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> (468.75), 100 grains weight (35.0837 g), grain yield (8.28 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">), stover yield (6.56 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) and harvest index (55.58%) over YANGNUO-3000. In </span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">case of weed control treatments, the highest plant height, leaf number plant</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">, number of grains cob</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;"> (464.54), 100 grains weight (37 g), grain yield (9.25 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">) and stover yield (7.46 t ha</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;">) were reported from T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">. All the parameters studied were found lowest with T</span><sub><span style="font-family:Verdana;">0</span></sub><span style="font-family:Verdana;">. However, in terms of interaction, no single interaction was superior </span></span><span style="font-family:Verdana;">to</span><span style="font-family:;" "=""><span style="font-family:Verdana;"> other alternatives. But in most of the cases V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> showed the highest values regarding the maximum plant height, leaf number plant</span></span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">, number of grains cob</span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;"> (494.97) and 100 grains weight (38 g). V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> showed the highest grain yield (9.33 t ha</span></span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;">), whereas, V</span><sub><span style="font-family:Verdana;">1</span></sub><span style="font-family:Verdana;">T</span><sub><span style="font-family:Verdana;">0</span></sub><span style="font-family:Verdana;"> showed the lowest grain yield (5.49 t ha</span></span><sup><span style="font-family:Verdana;">-1</span></sup><span style="font-family:Verdana;">). The lowest weed density and weed biomass (12.17 no. m</span><sup><span style="font-family:Verdana;">-2</span></sup><span style="font-family:Verdana;"> and 4.33 g·m</span><sup><span style="font-family:Verdana;">-2</span></sup><span style="font-family:;" "=""><span style="font-family:Verdana;">) was recorded from T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">. The highest weed control efficiency (94.38%) was also recorded from T</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">. In </span></span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">case of variety V</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;"> showed better performance in terms of weed density, weed biomass and WCE (46.32%).</span></span>
文摘This study quantified the effect of weeding frequency and weeding schedules on weeding operation time in a sugi(Cryptomeria japonica)plantation stand.A weeding operation time estimation model was developed;then the cumulative weeding operation time after six growing seasons was simulated using the developed model.The developed model included weed height,relative height of weeds to sugi,and initial planting density.The simulated cumulative weeding operation time decreased approximately 6%for each one-treatment decrease in weeding frequency.Under a three-treatment weeding frequency scenario,the simulated cumulative operation time when weeding was conducted during non-consecutive years was longer than that when weeding was conducted during three consecutive years.The results suggest that carrying out weeding treatment during consecutive years is the more effective for reduction of weeding costs.We conclude that weeding schedule as well as weeding frequency must be considered for reduction of weeding operation time.
基金Supported by National Science and Technology Support Program(2007BAD89B14)Special Fund for Agro-scientific Research in the PublicInterest(00803028)+3 种基金Major Technical Research Project of Ministry of Agriculture for Agricultural Structure Adjustment(06-03-07B)Project ofGuangdong Provincial Finance Department(YCY[2005]No.11,YCJ[2006]No.187)Agricultural Research Project of Guangdong ProvincialScience and Technology Department(2005B20101001)Special Fund forAgro-scientific Research in the Public Interest(201103001)
文摘Chemical weeding in dry direct seeding fields of single cropping middle-late rice was studied in Huida vegetable farm of Huizhou City in 2012. The main treatment was herbicide（ pretilachlor ＋ bensulfuron-methyl,Yangguo and butachlor）,and the sub-treatment was application method（ soil treatments,seedling treatment and integrated treatment）. The results showed that 80 g pretilachlor ＋ bensulfuron-methyl（ 36% pretilachlor ＋ 4% bensulfuron-methyl） diluted with 50 kg water could be sprayed or 200 g Yangguo（ 23. 9% butachlor ＋ 1. 1% bensulfuron-methyl） mixed with 15 kg sandy soil could be broadcasted per 667 m2 on the sowing day or the second day under moist condition of soil,which could effectively control weeds in dry direct seeding fields of single cropping middle-late rice.
文摘It is well known that quackgrass is both very aggressive and persistent. In agriculture, many attempts have been made to eliminate this weed without success. Within the context of a sustainable agriculture, mechanical control of quackgrass represents an interesting alternative to chemical means. The use of a ＂C＂ shaped mounted tine cultivator, a rotary cross-harrow, and an ＂S＂ shaped trailed tine cultivator （alone or in combination） to control quackgrass in grassland was investigated. The rate of quackgrass present in each experimental plot was determined before and after the treatments using a one square meter quadrant. Also, the time required for each passage as well as the fuel consumption were computed. Results revealed that the fuel consumption and the time required by the ＂C＂ and ＂S＂ shaped tine cultivators to transport and expose the rhizomes to the sun on the soil surface highly depend on the quality of tillage during the first stubble passage. Also, subsequent tillage with the ＂C＂ shaped tine cultivator after a first passage with a rotary cross-harrow resulted in less fuel consumption and passage time. On the other hand, stubble and subsequent soil tillage with only the ＂C＂ shaped tine cultivator is the least successful method.
基金funding from the China Agriculture Research System(CARS-22,Green Manure)the Natural Science Foundation Project from Chongqing Municipal Science and Technology Bureau,China(4322300357)the Green Manure Cultivation Technology Project from Chongqing Agricultural Technology Extension Station。
文摘Weeds have a negative impact on agricultural production by competing with cultivated crops for resources and fostering conditions conducive to disease and insect pest dissemination.Hence,optimal weed management is of paramount importance for sustainable agricultural.In this study,the ability of four distinct green manure species to suppress weeds was determined in a field experiment conducted in Chongqing,Southwest China.After cultivating the green manure species,the weed density and diversity were monitored over the following year.The findings highlight a notable trend in the suppressive ability of green manures,with increased suppression observed from November to March,an optimal level observed from March to May,and a gradual decline observed thereafter.Poaceae(Lolium perenne L.)demonstrated the highest efficacy in suppressing weeds.The meta-analysis underscore the exceptional suppressive effects of poaceous green manures on weed as well and prove sustained planting for three or more consecutive years yielded superior weed suppression outcomes.Green manure had the most prominent inhibitory effect on poaceae weeds,followed by Polygonaceae and Caryophyllaceae.The field experiment also investigated the effect of green manures on weed community composition,they increased in the proportion of perennial weeds within these communities.This study offers valuable insights that can guide policymakers,agricultural experts,and farmers in devising effective weed management strategies.By highlighting the potential benefits of green manures and unraveling their nuanced impact,this study contributes to the arsenal of sustainable agricultural practices.
文摘Accurate weed identification in farmland is crucial for enhancing intelligent weeding precision.This study focuses on weeds in maize seedling fields and builds an accurate identification model using the Faster-RCNN deep-learning algorithm.An image database is created,and the VGG-16 network extracts labeled datasets for weed feature extraction.By calculating random candidate region scores,a neural network training model is established to determine weed positions and types.This model achieves an average accuracy of 81.25%and an identification rate of 94.3%in weed identification.To test the model’s performance in the field,it is evaluated under different conditions,such as lighting,field of view,and occlusion.Occlusion has the most significant impact on the identification rate.Without occlusion,the precision is 94.4%,dropping to 79.2%when the occlusion rate exceeds 50%.However,adjusting the shooting angle can increase the precision to 97.1%.In real-world conditions,considering all factors,the weed identification precision is 94.3%.The results show that this technology is highly adaptable in the field with fast image detection.With GPU acceleration,the average detection speed per image is 50 milliseconds,and the video stream can reach 20 frames per second.This technology can adapt to complex environments,detect accurately,and has a short calculation time.It provides key support for automated mechanical weeding and holds great promise for practical applications in agricultural production.
基金Supported by "Technological Demonstration of Large-scale Planting of Fine Quality Forage Grass and Crops" Sponsored by the Ministry of Science and Technology (2007BAD80B03)"Forage Production System Research" Sponsored by the Ministry of Science and Technology (2007BAD63B04)~~
文摘[Objective] The aim was to provide scientific reference for the production of silage maize in correlated regions of Tibet.[Method] Effects of film mulching on the growth period,growth traits and yield of silage maize and weed were analyzed.[Result] Under the treatment of film mulching,the growth period of silage maize could be advanced for 7-16 d; the plant length,stem diameter and leaf area were increased; and the grain output was increased by 75.9%.According to the market price of silage maize in 2008,22 500 Yuan/hm^2 was increased.There were 13 kinds of weeds in silage maize field,which belonged to 13 genera,8 families.Among them,6 kinds of weeds belonged to Gramineae,among which Echinochloa crusgalli and Setaria viridis were dominated in the weed communities.Plantago depressa,Eragrostis pilosa and Malva verticillata var.chinensis could be totally controlled by the film mulching; meanwhile the others could be also controlled in a certain degree except Echinochloa crusgalli.[Conclusion] The plastic mulching planting is worth popularizing for the developing of animal husbandry and the incoming of the local farmers in Tibet.
基金Supported by the Special Fund for Agro-scientific Research in the Public Interest,China(200903024-02)~~
文摘[Objective] Through the investigation of weeds in Coffea arabica orchads in NuJiang River basin, this study aimed to provide scientific guidance for the weed control and improving the ecological and economic benefits of the plantation of Cof- fea arabica. [Method] The types of weeds and the characteristics of weed occur- rence in Coffea arabica orchads in Nujiang River basin were investigated from July to August in 2012. [Result] The results showed that there were 69 types of weeds belonging to 21 families in Coffea arabica orchads. The predominant harmful types were shown as follows： Commelina nudiflora L. ＋ Leptochloa chinensis, Cyperus ro- tundus L. ＋ Bidens pilosa L. ＋ Eleusine indica, Imperata cylindrical ＋ Ageratum conyzoides L. ＋ Eupatorium odoratum L., Ageratum conyzoides L. ＋ Digitaria san- guinalis （L.） Scop. The preponderant weeds consisted mainly of 10 species, namely, Cyperus rotundus L., Commelina nudiflora L., Leptochloa chinensis, Digitaria san- guinalis （L.） Scop, Imperata cylindrical, Bidens pilosa L., Ageratum conyzoides L, E- upatorium odoratum L., Eleusine indica and Chenopodium serotinum L. [Conclusion] The result from this study is of great significance for the plantation of Coffea arabica in Nujiang River basin, as well as the control of weeds.
基金Supported by Science and Technology Support Program of Hebei Province "Use Technology,Promotion and Application of Broad Spectrum Special Herbicide Monosulfuron Plus Propazine in Millet Fields" (09250307D)Special Foud for Agroscientific Research in the Public Interest (20120304201)~~
文摘[Objective] The paper was to resolve the poor efficacy or phytotoxicity problems in promotion of herbicide monosulfuron plus propazine 44% WP. [Method] Using orthogonal test and Duncan＇s new multiple range statistical analysis with four factors four levels and three factors two levels, the effects of factors such as herbi- cide dose, irrigation water volume, quality of soil preparation and soil moisture content on chemical control of monosulfuron plus propazine 44% WP against weeds and millet yield were compared in the test. [Result] Seven factors all had great impact on control effect of monosulfuron plus propazine 44% WP against weeds, of which her- bicide dose, irrigation water volume, quality of soil preparation and soil moisture content were the most important factors affecting millet yield. According to millet yield and economic benefit, the optimal scheme to ensure safe, efficient and economic control of monosulfuron plus propazine 44% WP against weeds was as follows： the dose of monosulfuron plus propazine 44% WP was 1 800 g/hm2, the soil was treat- ed after sowing and before seedling emergence; the soil should be smooth and sol- id; the soil moisture should reach 15%; the fields should not be irrigated after herbi- cide application, and the damage of weeds in millet fields could be effectively con- trolled within 45 d during high efficacy duration, especially the damage of dicotyledonous weeds. [Conclusion] The study provided useful information for comprehensive technology of weeds control and ensuring high yield and good harvest of millet.
基金Supported by Scientific Research and Development Plan of Department of Education of Shandong Province(J08LD51)~~
文摘Objective] The aim was to investigate the effects of Pb stress on seed germination and seedling growth of Chenopodium glaucum and Chenopodium serot-inum L. [Method] With C. glaucum and C. serotinum as the study objects, the ef-fects of different concentrations of Pb on their seed germination and seedling growth, as wel as on the leaf SOD, POD and CAT activity were studied primarily. [Result] The germination potential of both the two kinds of weed seeds increased first and then decreased with the increase of Pb concentration. The germination po-tential of C. serotinum and C. glaucum seeds reached the peak at Pb concentration of 25 and 50 mg/L, respectively. With the increase of Pb treatment concentration, the germination rate, germination index and vigor index of C. serotinum and C. glaucum seeds decreased, and their bud length and root length also reduced gradu-al y. ln overal , the leaf SOD, POD and CAT activity of C. glaucum and C. serot-inum_ seedlings increased first and then decreased with the increased treatment concentration of Pb. The leaf SOD and POD activity of C. glaucum and C. serot-inum seedlings reached the maximum at Pb concentration of 200 and 100 mg/L, respectively, and the leaf CAT activity reached the maximum at Pb concentration of 100 mg/L. [Conclusion] The two Chenopodium species had strong tolerance to Pb stress, and they could be used as alternative accumulator plants of soil Pb contami-nation.
基金Supported by Ministry of Science and Technology of China“National Project of Science and Technology for Food Production”(2004ba520a04)~~
文摘[Objective] Study on the effects of rice-duck mutualism on weeds and insects pests and economic benefits of paddy field. [Method] Comparison of the incidence of weeds, sheath blight and insects pest under rice-duck mutualism, conventional cultivation and control treatment, the yield and economic benefits were analyzed under the 3 treatments. [Result] Average occurrence of weeds in rice-duck mutualism group decreased by 2.33 and 52.0g ind/m^2 compared with that in conventional cultivation and control treatment ; the control rate of mutualism was up to 75% against rice hopper, but just between 25% -60% against rice leaf roller and Chilo suppressalis. The rates of diseased plant and diseased bell against rice sheath blight were higher and disease indices were lower compared with control group. The yield of mutualism group was identical with conventional cultivation, Which was greatly higher than that of control group. The results suggested an higher economic benefits and lower cost benefit ratio for rice-duck mutualism treatment. [Conclusion] Rice-duck mutualism gives birth to a positive effect to control the diseases, insect pests and weeds, as well as to economic benefits, providing basis on extension of rice-duck mutualism system.
基金Supported by "948" Project of National Forestry Bureau ( 2004-04-10)~~
文摘[ Objective] The paper was to explore the control effects of 3 kinds of herbicides against weeds in dogbane （Apocynum venetum） field. [ Method ] Using haloxyfop-R-mithyl and quizalofop-ethyl EC specifically killing monagenns gramineous weeds and chipton specifically killing dicotyledonous broad-leaf weeds, the control test against weeds in 2-year-old dogbane field was carried out. [ Result ] Haloxyfop-R-mithyl had good control effect against gramincous weeds, and its control effect against both barnyard weed （ Echinochloa crusgalli） and green bristleweed （ Setaria viridis ） was greater than 35.0% ; the control effects of quizalofop- ethyl EC against barnyard weed and green bristleweed were 14.8% and 28.6%, respectively; chipt0n had good control effect against Chenopodium album, and the control effect reached 30.8%. Moreover, 3 herbicides did not cause damage to dogbane. [ Conclusion] The study provide theoretical basis for completing cultivation technique of dogbane.
基金Supported by Shandong Science and Technology Program(2009GG10008014)Shandong Environmental Protection Research and Development Project(2011Xiaoqinghe)~~
文摘[Objective] The study aimed to investigate the early growth stage＇s response of invasive plant alligatorweed（Alternanthera philoxeroides） under salt stress.[Method] The alligatorweed was cultivated with four different NaCl concentrations 0（control）, 100, 200, 300 mmol/L diluted in 1/2 Hoagland＇s solution at early stage.During the period, we measured the number of nodes and leaves, length, fresh weight, dry weight and water content of stems to determine the effect of salt on alligatorweed growth. [Result] Compared with control, the node number, leaf number,length, fresh weight and dry weight of the stems significantly changed in NaCl solution, and the difference was positively related to NaCl concentration. We concluded that middle and high concentrations of NaCl significantly inhibited the growth of alligatorweed, by suppressing the node number, leaf number, length, fresh weight and dry weight of the stems. Among them, the stem length and fresh weight were more sensitive to NaCl stress. [Conclusion] The present result is helpful to understand the alligatorweed＇s adaptability to saline environment, and also helpful to prevent its invasion in such environment.
基金Supported by Earmarked Fund for China Agriculture Research System(CARS-20-2-2)Project for Yunnan Provincial Modern Agricultural Industry Technology System(YNGZTX-4-92)~~
文摘In order to screen herbicides with ideal safety characteristics to control malignant weed nut grass in sugarcane field, 20% thifensulfuron methyl WP and 65% MCPA·ametryne·diuron WP were selected for the field efficacy trial. The results showed that 20% thifensulfuron methyl WP and 65% MCPA·ametryne·diuron WP had good control effect on nut grass. The optimum dosage of 20% thifensulfuron methyl WP and 65% MCPA.ametryne-diuron WP was 1 125 g/hm^2 （effective ingredients 225 g） and 3 150 g/hm^2 （effective ingredients 2 047.5 g）, respectively. These two herbicides should be dissolved in 675 kg water per hectare and applied in the vigorous growth period of nut grass （height 10-15 cm） with oriented stem leaf spraying. The control effect after 15 days could be above 87.9%.
