[Objectives]This study was conducted to find out the best sowing date and sowing rate of rice.[Methods]Based on the technique of dry seedling raising in aperture disk,the effects of sowing date and sowing rate on rice...[Objectives]This study was conducted to find out the best sowing date and sowing rate of rice.[Methods]Based on the technique of dry seedling raising in aperture disk,the effects of sowing date and sowing rate on rice yield were studied.[Results]Sowing date and sowing rate per hole had obvious effects on tillering dynamics,growth process,number of panicles per unit area,number of filled grains per panicle and yield of rice developed from dry-raised seedlings.The comprehensive analysis showed that the highest yield was 10285.5 kg/hm 2 with the sowing date of May 20 and sowing rate of 5 grains/hole.[Conclusions]This study provides theoretical support and data support for the popularization and application of rice developed from seedlings dry raised in aperture disk.展开更多
To identify a strategy for earlier sowing and harvesting of spring maize(Zea mays L.) in an alternative maize–maize double cropping system, a 2-year field experiment was performed at Quzhou experimental station of Ch...To identify a strategy for earlier sowing and harvesting of spring maize(Zea mays L.) in an alternative maize–maize double cropping system, a 2-year field experiment was performed at Quzhou experimental station of China Agricultural University in 2014 and 2015. A short-season cultivar, Demeiya number 1(KX7349), was used in the experiment. Soil temperature to 5 cm depth in the early crop growth stage, crop growth, crop yield, and water use of different treatments(plastic film-mulched raised bed(RF) and flat field without plastic film mulching(CK) in 2014; RF, plastic film-mulched flat field(FF), and CK in 2015)were measured or calculated and compared. Soil temperature in the film-mulched treatments was consistently higher than that in CK(1.6–3.5 °C in average) during the early growth stage. Crops in plastic film-mulched treatments used 214 fewer growing-degree days(GDDs) in 2014 and 262 fewer GDDs in 2015. In 2014, the RF treatment yielded 32.7%higher biomass than CK, although its 9.4% higher grain yield was not statistically significant. Also, RF used 17.9% less water and showed 33.1% higher water use efficiency(WUE) than CK. In 2015, RF and FF showed 56.2% and 49.5% higher yield, 15.0% and 4.5%lower water use(ET), and 63.4% and 75.7% higher WUE, respectively, than CK. RF markedly increased soil temperature in the early crop season, accelerated crop growth, reduced ET,and greatly increased crop yield and WUE. Compared with FF, RF had no obvious effect on crop growth rate, although soil temperature during the period between sowing and stem elongation was slightly increased. However, RF resulted in lower ET and higher WUE than FF. Effects of RF on soil water dynamics as well as its cost-effectiveness remain topics for further study.展开更多
The no-till seeders of various soil opener configurations have been shown to produce various soil physical responses in relation to soil and climate conditions, thus affecting crop performance in permanent raised beds...The no-till seeders of various soil opener configurations have been shown to produce various soil physical responses in relation to soil and climate conditions, thus affecting crop performance in permanent raised beds （PRB） systems. This is particularly important in arid Northwest China where large volumes of residue are retained on the soil surface after harvest. In Zhangye, Gansu Province, China, a field trial assessed the effects of three typical （powered-chopper, powered-cutter and powered-disc） PRB no-till seeders and one traditional seeder on soil disturbance, residue cover index, bulk density, fuel consumption, plant growth, and subsequent yield. In general, seedbed conditions and crop performance for PRB no- till seeders seeded plots were better than for traditional seeded plots. In PRB cropping system, the powered-chopper seeder decreased mean soil disturbance and increased residue cover index compared to powered-disc and -cutter seeders. However, the results indicated that soil bulk density was 2.3-4.8% higher, soil temperature was 0.2-0.6℃ lower, and spring wheat emergence was 3.2-4.7% less. This was attributed to greater levels of residue cover and firmer seedbeds. Spring maize and wheat performance in the powered-cutter and -disc treatments was better （non-significant） than powered- chopper treatment. So powered disc no-till seeder, which generally provided the best planting condition and the highest yield, appeared to be the suitable seeder in heavy residue cover conditions. Considering the precision requirements for soil disturbance and residue cover, the powered strip-chopping no-till seeder could be a suitable option for PRB cropping system in Northwest China. Although these results are preliminary, they are still valuable for the design and selection of no-till seeders for PRB cropping systems in arid Northwest China.展开更多
Stagnating yield and declining input use efficiency in irrigated wheat of the Indo-Gangetic Plain (IGP) coupled with diminishing availability of water for agriculture is a major concern of food security in South Asia....Stagnating yield and declining input use efficiency in irrigated wheat of the Indo-Gangetic Plain (IGP) coupled with diminishing availability of water for agriculture is a major concern of food security in South Asia. The objective of our study was to establish an understanding of how wheat yield and input use efficiency can be improved and how land leveling and crop establishment practices can be modified to be more efficient in water use through layering of precision-conservation crop management techniques. The “precision land leveling with raised bed” planting can be used to improve crop yield, water and nutrient use efficiency over the existing “traditional land leveling with flat” planting practices. We conducted a field experiment during 2002-2004 at Modipuram, India to quantify the benefits of alternate land leveling (precision land leveling) and crop establishment (furrow irrigated raised bed planting) techniques alone or in combination (layering precision-conservation) in terms of crop yield, water savings, and nutrient use efficiency of wheat production in IGP. The wheat yield was about 16.6% higher with nearly 50% less irrigation water with layering precision land leveling and raised bed planting compared to traditional practices (traditional land leveling with flat planting). The agronomic (AE) and uptake efficiency (UE) of N, P and K were significantly improved under precision land leveling with raised bed planting technique compared to other practices.展开更多
In recent years, conventional rice production technologies have been leading to deterioration of soil health and declining farm profitability due to high inputs of water and labor. Conservation agriculture （CA） base...In recent years, conventional rice production technologies have been leading to deterioration of soil health and declining farm profitability due to high inputs of water and labor. Conservation agriculture （CA） based resource-conserving technologies i.e. zero-tillage （ZT）, raised-bed planting and direct-seeded rice （DSR） have shown promise as alternatives to conventional production technologies to overcome these problems. Present study was undertaken during 2009-2012 to establish an understanding of how permanent raised bed cropping system could be practiced to save water at the field application level to improve water productivity and also have the capability to enhance productivity, profitability and soil physical quality. The results showed that among different crop establishment techniques, conventional-tilled puddle transplanted rice （CT-TPR） required 14%-25% more water than other techniques. Compared with the CT-TPR system, zero till direct-seeded rice （ZT-DSR） consumed 6%-10%less water with almost equal system productivity and demonstrated higher water productivity. Wide raised beds saved about 15%-24% water and grain yield decrease of about 8%. Direct-seeded rice after ZT or reduced tillage or on unpuddled soil provided more net income than CT-TPR. The CT-TPR system had higher bulk density and penetration resistance due to compaction caused by the repeated wet tillage in rice. The steady-state infiltration rate and soil aggregation （〉 0.25 mm） were higher under permanent beds and ZT and lower in the CT-TPR system. Under CT-TPR, soil aggregation was static across seasons, whereas it improved under no-till and permanent beds. Similarly, mean weight diameter of aggregates was higher under ZT and permanent beds and increased over time. The study reveals that to sustain the rice productivity, CA-based planting techniques can be more viable options. However, the long-term effects of these alternative technologies need to be studied under varying agro-ecologies in western Uttar Pradesh, India.展开更多
Denitrification is an important process of nitrogen removal in lake ecosystems.However,the importance of denitrification across the entire soil-depth gradients including subsurface layers remains poorly understood.Thi...Denitrification is an important process of nitrogen removal in lake ecosystems.However,the importance of denitrification across the entire soil-depth gradients including subsurface layers remains poorly understood.This study aims to determine the spatial pattern of soil denitrification enzyme activity(DEA) and its environmental determinants across the entire soil depth gradients in the raised fields in Baiyang Lake,North China.In two different zones of the raised fields(i.e.,water boundary vs.main body of the raised fields),the soil samples from 1.0 m to 1.1 m depth were collected,and the DEA and following environmental determinants were quantified:soil moisture,p H,total nitrogen(TN),ammonia nitrogen(NH4+-N),nitrate nitrogen(NO3–-N),total organic carbon(TOC),and rhizome biomass of Phragmites australis.The results showed that the soil DEA and environmental factors had a striking zonal distribution across the entire soil depth gradients.The soil DEA reached two peak values in the upper and middle soil layers,indicating that denitrification are important in both topsoil and subsurface of the raised fields.The correlation analysis showed that the DEA is negatively correlated with the soil depth(p < 0.05).However,this phenomenon did not occur in the distance to the water edge,except in the upper layers(from 0.2 m to 0.7 m) of the boundary zone of the raised fields.In the main body of the raised fields,the DEA level remained high;however,it showed no significant relationship with the distance to the water edge.The linear regression analysis showed significant positive correlation of the DEA with the soil TN,NO3–-N,NH4+-N,and TOC;whereas it showed negative correlation with soil p H.No significant correlations with soil moisture and temperature were observed.A positive correlation was also found between the DEA and rhizome biomass of P.australis.展开更多
It is learned from oversea reports that, Indonesia launched a 20% tariff on 14 mineral products including iron ore since May 6th. It is reported, in addition to Indonesia, other countries will lift tariffs or limit th...It is learned from oversea reports that, Indonesia launched a 20% tariff on 14 mineral products including iron ore since May 6th. It is reported, in addition to Indonesia, other countries will lift tariffs or limit the export of mineral resources.展开更多
[Objectives]This study was conducted to investigate the effects of different planting densities on rice tillering dynamics and yield. [Methods]The effects of different planting densities on rice yield were studied bas...[Objectives]This study was conducted to investigate the effects of different planting densities on rice tillering dynamics and yield. [Methods]The effects of different planting densities on rice yield were studied based on seedlings dry raised in plug trays. [Results]Planting density had obvious effects on tillering dynamics,number of panicles per unit area,number of grains per panicle and rice yield under the condition of seedlings dry raised in plug trays. Comprehensive analysis showed that the row spacing × hill spacing = 25 cm × 14 cm,that is,the planting density of 2. 85 × 10~5 hills/hm^2,achieved the highest yield,at 9 960 kg/hm^2. [Conclusions]This study provides a scientific basis for optimizing rice cultivation techniques and achieving high yield and high efficiency in rice production.展开更多
Ministry of Natural Resources(MNR)and the Ministry of Industry and Information Technology(MIIT)of China recently released a notice on the first batch total production quota over rare-earths and tungsten in 2021.The to...Ministry of Natural Resources(MNR)and the Ministry of Industry and Information Technology(MIIT)of China recently released a notice on the first batch total production quota over rare-earths and tungsten in 2021.The total quota of rare earths(rare earth oxide REO,the same below)has 84000 t,a significant increase from the 66000 t in 2020.The total quota of tungsten concentrates(65%tungsten trioxide content,the same below)has 63000 t,up from 52500 t in 2020.The rise in quotas is in response to stronger demand from major downstream sectors following a significant recovery in the country’s economy from the impact of Covid-19.展开更多
<strong>Background:</strong> Raised intraocular pressure (IOP) is a major risk factor for glaucoma. Hypertensive patients are at a risk of developing and progression of Open Angle Glaucoma (OAG) which is a...<strong>Background:</strong> Raised intraocular pressure (IOP) is a major risk factor for glaucoma. Hypertensive patients are at a risk of developing and progression of Open Angle Glaucoma (OAG) which is a major cause of blindness in the world. The aim of this study was to determine the prevalence of raised IOP and associated factors among hypertensive patients attending the hypertension clinic at Mulago National Referral Hospital in Uganda. <strong>Materials and Methods:</strong> A cross-sectional study was conducted from December 2018 to March 2019. Our sample comprised hypertensive patients recruited after obtaining consent. Participants were sampled consecutively and underwent both a general medical and ocular examination. A questionnaire was used to collect data on socio-demographic characteristics, ocular and medical factors. Data were entered into the computer using the statistical data package of Epidata version 3.1 and exported to STATA version 14 for analysis. <strong>Results:</strong> Of the 405 hypertensive study participants, mean age was 57.1 years (range 25 to 90 years, SD = 12.4 years). The overall prevalence of raised intraocular pressure was 11.6% (95% CI 8.8 - 15.1). The mean IOP among all participants was 15.2 mmHg (SD = 4.3) with a range of 3 - 34 mmHg. The factors with a statistically significant association with raised intraocular pressure after multivariate analysis were a positive family history of Glaucoma (OR 57, CI 10.33 - 315.34, P < 0.001) and Eye trauma (OR 7.84, CI 1.02 - 60.02 P = 0.047). <strong>Conclusions:</strong> The prevalence of raised intraocular pressure among hypertensive patients attending the hypertension clinic in Mulago National Referral hospital, Uganda was found to be high.展开更多
President's proposal critical for pursuit of peace,development,experts say The Global Civilisation Initiative proposed by President Xi Jinping is regarded as not only highly relevant in this world fraught with cha...President's proposal critical for pursuit of peace,development,experts say The Global Civilisation Initiative proposed by President Xi Jinping is regarded as not only highly relevant in this world fraught with challenges and uncertainties,but also critical for the pursuit of common peace and development,according to Asia-Pacific experts.展开更多
Water-logging and the inability to take up sufficient iron (Fe), causing iron deficiency chlorosis (IDC) in soybean (<em>Glycine max</em>, L. Merr.), can be major yield reducing factors in certain soils in...Water-logging and the inability to take up sufficient iron (Fe), causing iron deficiency chlorosis (IDC) in soybean (<em>Glycine max</em>, L. Merr.), can be major yield reducing factors in certain soils in the northern USA and Manitoba, Canada, soybean growing regions. The objective of this research was to evaluate soybean IDC, biomass production, and yield with seeding on raised beds and seed application of the Fe-chelate compound ortho-ortho-Fe-EDDHA. In six environments, soybean were seeded on raised beds and conventionally prepared seedbeds (flat) and with a factorial arrangement of five cultivars (within adapted maturity group 0.1 to 0.9 and variable IDC tolerance) and seed applied Fe-EDDHA using rates of 0 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup> and 3.36 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup>. There were no significant interactions between the factors tested. The plant population was 27% higher on the raised beds compared with flat, and yield was 6.3% higher (2893 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup> vs. 2722 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup>). Total dry plant biomass on raised beds was 9.8% greater compared with flat. The plant population with seed applied Fe-EDDHA was 10.6% lower compared with no application. However, the IDC score was significantly lower 2.2 vs 2.4 (1 = green, 5 = dead) for Fe-EDDHA seed application. Yield and plant biomass were not significantly different between Fe treatments. Raised beds offer an opportunity for soybean growers to reduce the negative influence of excessive water. Further research is needed to determine the long-term effect of raised beds on plant development, IDC expression, and yield. The application of Fe-EDDHA remains a partial solution and should therefore be combined with other methods to reduce IDC. Further research should study other Fe-EDDHA application rates and methods.展开更多
China’s top legislature has received more than 230,000 public submissions in just over a month on a draft amendment to increase the minimum threshold for personal income tax from 2,000 yuan($308) per month to 3,000 y...China’s top legislature has received more than 230,000 public submissions in just over a month on a draft amendment to increase the minimum threshold for personal income tax from 2,000 yuan($308) per month to 3,000 yuan($462). The draft also proposes a reduction in the number of income tax brackets from the current nine to seven.Thrown open for public opinion on April 25,2011,the provision seeks to amend China’s Personal Income Tax Law that was first introduced in 1980.展开更多
"We are pleased to announce another quarter of profitable growth,"said Dr.Roland Fischer,CEO of Oerlikon Group."Our positive performance confirms that our strategy addresses attractive markets,our initi..."We are pleased to announce another quarter of profitable growth,"said Dr.Roland Fischer,CEO of Oerlikon Group."Our positive performance confirms that our strategy addresses attractive markets,our initiatives and activities are delivering positive results,and we are able to take advantage of the growth momentum and opportunities in our end markets.Consequently,we are in a position to increase our full-year expectations for the second time this year."展开更多
The prices of some drugs have surged up recently with a cardiac medicine, for instance, costing 10 times more. Some consumers are linking it to the latest reform in China＇s drug regulation history. In May, the Nation...The prices of some drugs have surged up recently with a cardiac medicine, for instance, costing 10 times more. Some consumers are linking it to the latest reform in China＇s drug regulation history. In May, the National Development and Reform Commission （NDRC）, China＇s top economic regulator, announced the price ceiling imposed by the government on over 2,700 pharmaceutical drugs would be removed from June 1 onward.展开更多
A raised panel method based on NURBS (Non-Uniform Rational B-Splines) forfree-surface flows with forward speed is presented. In this generalized panel method, NURBS areemployed to represent the body geometry, disturbe...A raised panel method based on NURBS (Non-Uniform Rational B-Splines) forfree-surface flows with forward speed is presented. In this generalized panel method, NURBS areemployed to represent the body geometry, disturbed free surface, and to express the unknown sourcestrength distribution, on the body surface and above the free surface. Compared with commonhigher-order panel methods, it has no need of adopting local coordinates. NURBS make the geometryrepresentation of the body shape and the wave pattern more precise. Raised panels above the freesurface produce less numerical dispersion error, need less CPU consumption and are helpful andcombined with collocation-point shifting up-stream, can satisfy the radiation condition numerically.By using continuous and discrete Fourier analysis, numerical errors of this method are discussedand a general expression for the errors of numerical damping and dispersion, including the effectsof the vertical distance of singularities to the free surface, the order of singularity distributionrepresented by B-splines in panels, and collocation-point shifting is derived.展开更多
At a seminar of the dairy industry in June,Wang Dingmian,President of the Guangzhou Dairy Association,attacked China’s current raw milk standard,saying the current standard is more
[Objectives]To investigate the clinical efficacy of Cyclic Flexion Traction(CFT)in treating Lumbar Disc Herniation(LDH)and its effects on lumbocrural pain relief,functional improvement,and nerve root decompression.[Me...[Objectives]To investigate the clinical efficacy of Cyclic Flexion Traction(CFT)in treating Lumbar Disc Herniation(LDH)and its effects on lumbocrural pain relief,functional improvement,and nerve root decompression.[Methods]Seventy LDH patients treated at the orthopedic rehabilitation outpatient and inpatient departments of Shiyan Taihe Hospital from June 2022 to December 2024 were randomly divided into a treatment group(CFT therapy,n=35)and a control group(traditional traction,n=35).The treatment group received cyclic flexion traction(traction force of 30%-50%body weight with a cycle of 60-30-30 sec),while the control group received supine position linear traction.Both groups underwent 4 weeks of treatment,with assessments including visual analog scale(VAS),Oswestry Disability Index(ODI),and straight leg raising test(SLRT)angles.[Results]The treatment group showed a significantly greater reduction in VAS scores(from 6.97 to 2.31)compared to the control group(from 6.89 to 3.74)(P<0.05).Similarly,ODI improvement(41.62→15.73 compared with 40.98→22.84)and SLRT angle increase(41.23°→76.47°compared with 42.09°→64.19°)were more pronounced in the treatment group(all P<0.05).[Conclusions]Through dynamic decompression mechanisms,CFT therapy demonstrates superior efficacy to traditional traction in pain relief,functional recovery,and nerve root decompression(effective rate 94.29%compared with 77.14%,P<0.05),representing a superior non-surgical treatment option.展开更多
Village CEOs strive to raise incomes in rural Nujiang Lisu Autonomous Prefecture.To advance rural revitalisation,Nujiang Lisu Autonomous Prefecture has,in recent years,introduced the“village CEO”model as part of its...Village CEOs strive to raise incomes in rural Nujiang Lisu Autonomous Prefecture.To advance rural revitalisation,Nujiang Lisu Autonomous Prefecture has,in recent years,introduced the“village CEO”model as part of its efforts to integrate agriculture,culture,and tourism.This model has emerged as a key strategy for addressing the shortage of rural talent and stimulating regional development.展开更多
基金Supported by Key R&D Program of Shandong Province(Action Plan for Rural Revitalization,Scientific and Technological Innovation and Boosting)(2023TZXD008)Key R&D Program of Shandong Province(Agricultural Improved Variety Project)(2024LZGCQY007)Innovation Ability Promotion Project of Shandong Province(2024TSGC0841,2024TSGC0205).
文摘[Objectives]This study was conducted to find out the best sowing date and sowing rate of rice.[Methods]Based on the technique of dry seedling raising in aperture disk,the effects of sowing date and sowing rate on rice yield were studied.[Results]Sowing date and sowing rate per hole had obvious effects on tillering dynamics,growth process,number of panicles per unit area,number of filled grains per panicle and yield of rice developed from dry-raised seedlings.The comprehensive analysis showed that the highest yield was 10285.5 kg/hm 2 with the sowing date of May 20 and sowing rate of 5 grains/hole.[Conclusions]This study provides theoretical support and data support for the popularization and application of rice developed from seedlings dry raised in aperture disk.
基金financially supported by the Special Fund for Agro-scientific Research in the Public Interest (No. 201103001)
文摘To identify a strategy for earlier sowing and harvesting of spring maize(Zea mays L.) in an alternative maize–maize double cropping system, a 2-year field experiment was performed at Quzhou experimental station of China Agricultural University in 2014 and 2015. A short-season cultivar, Demeiya number 1(KX7349), was used in the experiment. Soil temperature to 5 cm depth in the early crop growth stage, crop growth, crop yield, and water use of different treatments(plastic film-mulched raised bed(RF) and flat field without plastic film mulching(CK) in 2014; RF, plastic film-mulched flat field(FF), and CK in 2015)were measured or calculated and compared. Soil temperature in the film-mulched treatments was consistently higher than that in CK(1.6–3.5 °C in average) during the early growth stage. Crops in plastic film-mulched treatments used 214 fewer growing-degree days(GDDs) in 2014 and 262 fewer GDDs in 2015. In 2014, the RF treatment yielded 32.7%higher biomass than CK, although its 9.4% higher grain yield was not statistically significant. Also, RF used 17.9% less water and showed 33.1% higher water use efficiency(WUE) than CK. In 2015, RF and FF showed 56.2% and 49.5% higher yield, 15.0% and 4.5%lower water use(ET), and 63.4% and 75.7% higher WUE, respectively, than CK. RF markedly increased soil temperature in the early crop season, accelerated crop growth, reduced ET,and greatly increased crop yield and WUE. Compared with FF, RF had no obvious effect on crop growth rate, although soil temperature during the period between sowing and stem elongation was slightly increased. However, RF resulted in lower ET and higher WUE than FF. Effects of RF on soil water dynamics as well as its cost-effectiveness remain topics for further study.
基金financed by the National Natural Science Foundation of China (51175499)the Beijing Natural Science Foundation, China (6112015)the Australian Centre for International Agricultural Research (ACIAR)
文摘The no-till seeders of various soil opener configurations have been shown to produce various soil physical responses in relation to soil and climate conditions, thus affecting crop performance in permanent raised beds （PRB） systems. This is particularly important in arid Northwest China where large volumes of residue are retained on the soil surface after harvest. In Zhangye, Gansu Province, China, a field trial assessed the effects of three typical （powered-chopper, powered-cutter and powered-disc） PRB no-till seeders and one traditional seeder on soil disturbance, residue cover index, bulk density, fuel consumption, plant growth, and subsequent yield. In general, seedbed conditions and crop performance for PRB no- till seeders seeded plots were better than for traditional seeded plots. In PRB cropping system, the powered-chopper seeder decreased mean soil disturbance and increased residue cover index compared to powered-disc and -cutter seeders. However, the results indicated that soil bulk density was 2.3-4.8% higher, soil temperature was 0.2-0.6℃ lower, and spring wheat emergence was 3.2-4.7% less. This was attributed to greater levels of residue cover and firmer seedbeds. Spring maize and wheat performance in the powered-cutter and -disc treatments was better （non-significant） than powered- chopper treatment. So powered disc no-till seeder, which generally provided the best planting condition and the highest yield, appeared to be the suitable seeder in heavy residue cover conditions. Considering the precision requirements for soil disturbance and residue cover, the powered strip-chopping no-till seeder could be a suitable option for PRB cropping system in Northwest China. Although these results are preliminary, they are still valuable for the design and selection of no-till seeders for PRB cropping systems in arid Northwest China.
文摘Stagnating yield and declining input use efficiency in irrigated wheat of the Indo-Gangetic Plain (IGP) coupled with diminishing availability of water for agriculture is a major concern of food security in South Asia. The objective of our study was to establish an understanding of how wheat yield and input use efficiency can be improved and how land leveling and crop establishment practices can be modified to be more efficient in water use through layering of precision-conservation crop management techniques. The “precision land leveling with raised bed” planting can be used to improve crop yield, water and nutrient use efficiency over the existing “traditional land leveling with flat” planting practices. We conducted a field experiment during 2002-2004 at Modipuram, India to quantify the benefits of alternate land leveling (precision land leveling) and crop establishment (furrow irrigated raised bed planting) techniques alone or in combination (layering precision-conservation) in terms of crop yield, water savings, and nutrient use efficiency of wheat production in IGP. The wheat yield was about 16.6% higher with nearly 50% less irrigation water with layering precision land leveling and raised bed planting compared to traditional practices (traditional land leveling with flat planting). The agronomic (AE) and uptake efficiency (UE) of N, P and K were significantly improved under precision land leveling with raised bed planting technique compared to other practices.
基金the project ‘Resource Conservation Technologies for Sustainable Development of Agriculture’
文摘In recent years, conventional rice production technologies have been leading to deterioration of soil health and declining farm profitability due to high inputs of water and labor. Conservation agriculture （CA） based resource-conserving technologies i.e. zero-tillage （ZT）, raised-bed planting and direct-seeded rice （DSR） have shown promise as alternatives to conventional production technologies to overcome these problems. Present study was undertaken during 2009-2012 to establish an understanding of how permanent raised bed cropping system could be practiced to save water at the field application level to improve water productivity and also have the capability to enhance productivity, profitability and soil physical quality. The results showed that among different crop establishment techniques, conventional-tilled puddle transplanted rice （CT-TPR） required 14%-25% more water than other techniques. Compared with the CT-TPR system, zero till direct-seeded rice （ZT-DSR） consumed 6%-10%less water with almost equal system productivity and demonstrated higher water productivity. Wide raised beds saved about 15%-24% water and grain yield decrease of about 8%. Direct-seeded rice after ZT or reduced tillage or on unpuddled soil provided more net income than CT-TPR. The CT-TPR system had higher bulk density and penetration resistance due to compaction caused by the repeated wet tillage in rice. The steady-state infiltration rate and soil aggregation （〉 0.25 mm） were higher under permanent beds and ZT and lower in the CT-TPR system. Under CT-TPR, soil aggregation was static across seasons, whereas it improved under no-till and permanent beds. Similarly, mean weight diameter of aggregates was higher under ZT and permanent beds and increased over time. The study reveals that to sustain the rice productivity, CA-based planting techniques can be more viable options. However, the long-term effects of these alternative technologies need to be studied under varying agro-ecologies in western Uttar Pradesh, India.
基金Under the auspices of National Science Fund for Distinguished Young Scholars(No.51125035)National Science Foundation for Innovative Research Group(No.51121003)Major Science and Technology Program for Water Pollution Control and Treatment(No.2009ZX07209-008)
文摘Denitrification is an important process of nitrogen removal in lake ecosystems.However,the importance of denitrification across the entire soil-depth gradients including subsurface layers remains poorly understood.This study aims to determine the spatial pattern of soil denitrification enzyme activity(DEA) and its environmental determinants across the entire soil depth gradients in the raised fields in Baiyang Lake,North China.In two different zones of the raised fields(i.e.,water boundary vs.main body of the raised fields),the soil samples from 1.0 m to 1.1 m depth were collected,and the DEA and following environmental determinants were quantified:soil moisture,p H,total nitrogen(TN),ammonia nitrogen(NH4+-N),nitrate nitrogen(NO3–-N),total organic carbon(TOC),and rhizome biomass of Phragmites australis.The results showed that the soil DEA and environmental factors had a striking zonal distribution across the entire soil depth gradients.The soil DEA reached two peak values in the upper and middle soil layers,indicating that denitrification are important in both topsoil and subsurface of the raised fields.The correlation analysis showed that the DEA is negatively correlated with the soil depth(p < 0.05).However,this phenomenon did not occur in the distance to the water edge,except in the upper layers(from 0.2 m to 0.7 m) of the boundary zone of the raised fields.In the main body of the raised fields,the DEA level remained high;however,it showed no significant relationship with the distance to the water edge.The linear regression analysis showed significant positive correlation of the DEA with the soil TN,NO3–-N,NH4+-N,and TOC;whereas it showed negative correlation with soil p H.No significant correlations with soil moisture and temperature were observed.A positive correlation was also found between the DEA and rhizome biomass of P.australis.
文摘It is learned from oversea reports that, Indonesia launched a 20% tariff on 14 mineral products including iron ore since May 6th. It is reported, in addition to Indonesia, other countries will lift tariffs or limit the export of mineral resources.
基金Supported by Major Applied Agricultural Technology Innovation Project of Shandong Province (SD2019ZZ020)Key R&D Program of Shandong Province(2019GSF109078)+2 种基金Rice Innovation Team Construction Project of Shandong Modern Agricultural Industry Technology System (SDAIT-17-09)Innovation Project of Shandong Academy of Agricultural Sciences (CXGC2018E03)Youth Fund Project of Shandong Academy of Agricultural Sciences (2015YQN25)。
文摘[Objectives]This study was conducted to investigate the effects of different planting densities on rice tillering dynamics and yield. [Methods]The effects of different planting densities on rice yield were studied based on seedlings dry raised in plug trays. [Results]Planting density had obvious effects on tillering dynamics,number of panicles per unit area,number of grains per panicle and rice yield under the condition of seedlings dry raised in plug trays. Comprehensive analysis showed that the row spacing × hill spacing = 25 cm × 14 cm,that is,the planting density of 2. 85 × 10~5 hills/hm^2,achieved the highest yield,at 9 960 kg/hm^2. [Conclusions]This study provides a scientific basis for optimizing rice cultivation techniques and achieving high yield and high efficiency in rice production.
文摘Ministry of Natural Resources(MNR)and the Ministry of Industry and Information Technology(MIIT)of China recently released a notice on the first batch total production quota over rare-earths and tungsten in 2021.The total quota of rare earths(rare earth oxide REO,the same below)has 84000 t,a significant increase from the 66000 t in 2020.The total quota of tungsten concentrates(65%tungsten trioxide content,the same below)has 63000 t,up from 52500 t in 2020.The rise in quotas is in response to stronger demand from major downstream sectors following a significant recovery in the country’s economy from the impact of Covid-19.
文摘<strong>Background:</strong> Raised intraocular pressure (IOP) is a major risk factor for glaucoma. Hypertensive patients are at a risk of developing and progression of Open Angle Glaucoma (OAG) which is a major cause of blindness in the world. The aim of this study was to determine the prevalence of raised IOP and associated factors among hypertensive patients attending the hypertension clinic at Mulago National Referral Hospital in Uganda. <strong>Materials and Methods:</strong> A cross-sectional study was conducted from December 2018 to March 2019. Our sample comprised hypertensive patients recruited after obtaining consent. Participants were sampled consecutively and underwent both a general medical and ocular examination. A questionnaire was used to collect data on socio-demographic characteristics, ocular and medical factors. Data were entered into the computer using the statistical data package of Epidata version 3.1 and exported to STATA version 14 for analysis. <strong>Results:</strong> Of the 405 hypertensive study participants, mean age was 57.1 years (range 25 to 90 years, SD = 12.4 years). The overall prevalence of raised intraocular pressure was 11.6% (95% CI 8.8 - 15.1). The mean IOP among all participants was 15.2 mmHg (SD = 4.3) with a range of 3 - 34 mmHg. The factors with a statistically significant association with raised intraocular pressure after multivariate analysis were a positive family history of Glaucoma (OR 57, CI 10.33 - 315.34, P < 0.001) and Eye trauma (OR 7.84, CI 1.02 - 60.02 P = 0.047). <strong>Conclusions:</strong> The prevalence of raised intraocular pressure among hypertensive patients attending the hypertension clinic in Mulago National Referral hospital, Uganda was found to be high.
文摘President's proposal critical for pursuit of peace,development,experts say The Global Civilisation Initiative proposed by President Xi Jinping is regarded as not only highly relevant in this world fraught with challenges and uncertainties,but also critical for the pursuit of common peace and development,according to Asia-Pacific experts.
文摘Water-logging and the inability to take up sufficient iron (Fe), causing iron deficiency chlorosis (IDC) in soybean (<em>Glycine max</em>, L. Merr.), can be major yield reducing factors in certain soils in the northern USA and Manitoba, Canada, soybean growing regions. The objective of this research was to evaluate soybean IDC, biomass production, and yield with seeding on raised beds and seed application of the Fe-chelate compound ortho-ortho-Fe-EDDHA. In six environments, soybean were seeded on raised beds and conventionally prepared seedbeds (flat) and with a factorial arrangement of five cultivars (within adapted maturity group 0.1 to 0.9 and variable IDC tolerance) and seed applied Fe-EDDHA using rates of 0 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup> and 3.36 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup>. There were no significant interactions between the factors tested. The plant population was 27% higher on the raised beds compared with flat, and yield was 6.3% higher (2893 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup> vs. 2722 kg<span style="white-space:nowrap;"><span style="white-space:nowrap;">·</span></span>ha<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup>). Total dry plant biomass on raised beds was 9.8% greater compared with flat. The plant population with seed applied Fe-EDDHA was 10.6% lower compared with no application. However, the IDC score was significantly lower 2.2 vs 2.4 (1 = green, 5 = dead) for Fe-EDDHA seed application. Yield and plant biomass were not significantly different between Fe treatments. Raised beds offer an opportunity for soybean growers to reduce the negative influence of excessive water. Further research is needed to determine the long-term effect of raised beds on plant development, IDC expression, and yield. The application of Fe-EDDHA remains a partial solution and should therefore be combined with other methods to reduce IDC. Further research should study other Fe-EDDHA application rates and methods.
文摘China’s top legislature has received more than 230,000 public submissions in just over a month on a draft amendment to increase the minimum threshold for personal income tax from 2,000 yuan($308) per month to 3,000 yuan($462). The draft also proposes a reduction in the number of income tax brackets from the current nine to seven.Thrown open for public opinion on April 25,2011,the provision seeks to amend China’s Personal Income Tax Law that was first introduced in 1980.
文摘"We are pleased to announce another quarter of profitable growth,"said Dr.Roland Fischer,CEO of Oerlikon Group."Our positive performance confirms that our strategy addresses attractive markets,our initiatives and activities are delivering positive results,and we are able to take advantage of the growth momentum and opportunities in our end markets.Consequently,we are in a position to increase our full-year expectations for the second time this year."
文摘The prices of some drugs have surged up recently with a cardiac medicine, for instance, costing 10 times more. Some consumers are linking it to the latest reform in China＇s drug regulation history. In May, the National Development and Reform Commission （NDRC）, China＇s top economic regulator, announced the price ceiling imposed by the government on over 2,700 pharmaceutical drugs would be removed from June 1 onward.
文摘A raised panel method based on NURBS (Non-Uniform Rational B-Splines) forfree-surface flows with forward speed is presented. In this generalized panel method, NURBS areemployed to represent the body geometry, disturbed free surface, and to express the unknown sourcestrength distribution, on the body surface and above the free surface. Compared with commonhigher-order panel methods, it has no need of adopting local coordinates. NURBS make the geometryrepresentation of the body shape and the wave pattern more precise. Raised panels above the freesurface produce less numerical dispersion error, need less CPU consumption and are helpful andcombined with collocation-point shifting up-stream, can satisfy the radiation condition numerically.By using continuous and discrete Fourier analysis, numerical errors of this method are discussedand a general expression for the errors of numerical damping and dispersion, including the effectsof the vertical distance of singularities to the free surface, the order of singularity distributionrepresented by B-splines in panels, and collocation-point shifting is derived.
文摘At a seminar of the dairy industry in June,Wang Dingmian,President of the Guangzhou Dairy Association,attacked China’s current raw milk standard,saying the current standard is more
基金Supported by the Hospital-level Program of Shiyan Taihe Hospital(2022JJXM144).
文摘[Objectives]To investigate the clinical efficacy of Cyclic Flexion Traction(CFT)in treating Lumbar Disc Herniation(LDH)and its effects on lumbocrural pain relief,functional improvement,and nerve root decompression.[Methods]Seventy LDH patients treated at the orthopedic rehabilitation outpatient and inpatient departments of Shiyan Taihe Hospital from June 2022 to December 2024 were randomly divided into a treatment group(CFT therapy,n=35)and a control group(traditional traction,n=35).The treatment group received cyclic flexion traction(traction force of 30%-50%body weight with a cycle of 60-30-30 sec),while the control group received supine position linear traction.Both groups underwent 4 weeks of treatment,with assessments including visual analog scale(VAS),Oswestry Disability Index(ODI),and straight leg raising test(SLRT)angles.[Results]The treatment group showed a significantly greater reduction in VAS scores(from 6.97 to 2.31)compared to the control group(from 6.89 to 3.74)(P<0.05).Similarly,ODI improvement(41.62→15.73 compared with 40.98→22.84)and SLRT angle increase(41.23°→76.47°compared with 42.09°→64.19°)were more pronounced in the treatment group(all P<0.05).[Conclusions]Through dynamic decompression mechanisms,CFT therapy demonstrates superior efficacy to traditional traction in pain relief,functional recovery,and nerve root decompression(effective rate 94.29%compared with 77.14%,P<0.05),representing a superior non-surgical treatment option.
文摘Village CEOs strive to raise incomes in rural Nujiang Lisu Autonomous Prefecture.To advance rural revitalisation,Nujiang Lisu Autonomous Prefecture has,in recent years,introduced the“village CEO”model as part of its efforts to integrate agriculture,culture,and tourism.This model has emerged as a key strategy for addressing the shortage of rural talent and stimulating regional development.
