A field experiment was employed to study the degradation of triadimefon and difenoconazole residues in strawberry and soil. The results showed that the degradation of both the two kinds of pesticides was in accordance...A field experiment was employed to study the degradation of triadimefon and difenoconazole residues in strawberry and soil. The results showed that the degradation of both the two kinds of pesticides was in accordance with the first order kinetic equation. The half-lives of difenoconazole in strawberry fruit, strawberry stem leaf and soil were 4.09, 8.21 and 13.38 d, respectively; and the half-lives of triadimefon in strawberry fruit, strawberry stem and leaf and soil were 3.38, 5.31 and 15.64 d, respectively. The maximum residue limit （MRL） of difenoconazole in strawberry was recommended as 0.5 mg/kg, and 10% difenoconazole WG and 20% triadimefon EC should be applied four times with a safety interval of 7 d according to the amounts of 100 and 60 g a. i./hm2,respectively.展开更多
The photochemical degradation of triadimefon in seawater was investigated under different reaction conditions in this study. The results showed that triadimefon could be effectively degraded by the irradiation of a hi...The photochemical degradation of triadimefon in seawater was investigated under different reaction conditions in this study. The results showed that triadimefon could be effectively degraded by the irradiation of a high-pressure mercury lamp and the photodegradation rates were influenced by aquatic media, heavy metal ions and photosensitizers. The photochemical degradation of triadimefon followed the first-order reaction kinetic behavior, with the rate constants ranging from 0.0027 to 0.0128 min-1 under the studied conditions. The photolysis of triadimefon was slower in natural seawater than in distilled water or synthetic seawater. All the heavy metal ions studied in this paper had inhibition effects on the photolysis of triadimefon. Acetone, as a common photosensitizer, could accelerate the photolysis of triadimefon. Three photoproducts were identified by GC-MS analysis. Our study confirmed that photochemical degradation is an effective pathway to remove triadimefon in seawater.展开更多
The ability of triadimefon （TDM）, a triazolic fungicide, to alter the biochemical constituents and thereby minimizing the days required for sprouting in white yam （Dioscorea rotundata Poir.） tubers during storage ...The ability of triadimefon （TDM）, a triazolic fungicide, to alter the biochemical constituents and thereby minimizing the days required for sprouting in white yam （Dioscorea rotundata Poir.） tubers during storage under （30±2） ℃ in the dark, was studied. TDM at 20 mg/L was given to tubers by dipping the tubers in treatment solution containing 20 mg/L TDM on 10, 25 and 40 d after storage （DAS）. Starch, sugars, protein, amino acid contents as well as protease and a-amylase activities were estimated on 15, 30 and 45 DAS from two physiological regions viz., apical and basal regions of the tubers. In normal conditions （control） sprouting occurred on 70 to 80 DAS. The starch content decreased, while protein, amino acid, sugar contents and protease and a-amylase activities were increased due to TDM treatment and led to early sprouting.展开更多
This paper explored the control efficiency of 36% Carbendazim triadimefon SC on wheat powdery mildew, wheat pink mold and rope sclerotinia, and the impact on rape yield through field experiment. The results showed tha...This paper explored the control efficiency of 36% Carbendazim triadimefon SC on wheat powdery mildew, wheat pink mold and rope sclerotinia, and the impact on rape yield through field experiment. The results showed that the control efficiency was the best on the 7th and 14th day after the application of 36% Car- bendazim triadimefon SC in the dosage of 2 250 mL/hm2, and rope yield was improved by 32%.展开更多
The present study showed that pretreatment of triadimefon(TDM),a triazole compound,could improve tolerance of soybean seedlings to subsequent water stress.TDM pretreatment resulted in early and late rise in superoxide...The present study showed that pretreatment of triadimefon(TDM),a triazole compound,could improve tolerance of soybean seedlings to subsequent water stress.TDM pretreatment resulted in early and late rise in superoxide dismutase(SOD)and catalase(CAT)activities,and upregulation of ascorbate(As A)content in non-stressed and water-stressed seedlings,leading to late increase in net photosynthetic rate(Pn),late decrease in hydrogen peroxide(H2O2)and electrolyte leakage in stressed ones.These TDM-induced changes were blocked by application of abscisic acid(ABA)biosynthesis inhibitor tungstate,which inhibited early rise of ABA and H2O2contents in non-stressed and stressed seedlings.However,ABA pretreatment overcomed the effects of this inhibitor.Application of NADPH oxidase inhibitor diphenyleneiodonium(DPI),polyamine oxidase(PAO)inhibitor 2-hydroxyethylhydrazine(2-HEH)and H2O2scavenger dimethylthiourea(DMTU)prevented early TDM-induced rise of H2O2content.DPI,2-HEH and DMTU also decreased SOD,CAT and As A levels,but did not affect ABA content during early and late phases in both seedlings pretreated with TDM.In addition,these chemicals decreased Pn,and increased H2O2content and electrolyte leakage during late phase in TDM-pretreated stressed seedlings.Overall,these results indicated that TDM pretreatment alleviated adverse effects of water stress on soybean seedlings,which was at least in part,due to increase of antioxidant capacity and decrease of oxidative damage induced by early ABA-dependent H2O2generation.展开更多
对Triad im efon在土壤中的降解和吸附行为进行了研究。两年的大田试验结果表明Triad im efon在红壤中半衰期分别为3.68d和8.77d,水稻土中分别为3.69d和7.63d,其降解受温度影响较大。批量法研究的Triad im efon在四种土壤中的吸附行为...对Triad im efon在土壤中的降解和吸附行为进行了研究。两年的大田试验结果表明Triad im efon在红壤中半衰期分别为3.68d和8.77d,水稻土中分别为3.69d和7.63d,其降解受温度影响较大。批量法研究的Triad im efon在四种土壤中的吸附行为的试验结果表明Triad im efon在土壤中的吸附符合Freund lich经验公式;Kd随土壤有机质含量的增加而增大,吸附性与土壤有机质含量呈正相关;土壤有机质吸附常数Koc为259,表明Triad im efon在土壤中的移动性为中等:在土壤中的吸附量随温度的升高而降低,在土壤中的吸附主要为物理吸附。展开更多
基金Supported by Tripartite Joint Fund of Science and Technology Department of Guizhou Province(LH[2016]7278)Agricultural Science and Technology Project of Science and Technology Department of Guizhou Province(NZ[2013]3029)+1 种基金Tripartite Joint Fund of Science and Technology Department of Guizhou Province(Key Project)(JLKA[2012]03)Natural Science Research Project of Department of Education of Guizhou Province(2011054)~~
文摘A field experiment was employed to study the degradation of triadimefon and difenoconazole residues in strawberry and soil. The results showed that the degradation of both the two kinds of pesticides was in accordance with the first order kinetic equation. The half-lives of difenoconazole in strawberry fruit, strawberry stem leaf and soil were 4.09, 8.21 and 13.38 d, respectively; and the half-lives of triadimefon in strawberry fruit, strawberry stem and leaf and soil were 3.38, 5.31 and 15.64 d, respectively. The maximum residue limit （MRL） of difenoconazole in strawberry was recommended as 0.5 mg/kg, and 10% difenoconazole WG and 20% triadimefon EC should be applied four times with a safety interval of 7 d according to the amounts of 100 and 60 g a. i./hm2,respectively.
文摘The photochemical degradation of triadimefon in seawater was investigated under different reaction conditions in this study. The results showed that triadimefon could be effectively degraded by the irradiation of a high-pressure mercury lamp and the photodegradation rates were influenced by aquatic media, heavy metal ions and photosensitizers. The photochemical degradation of triadimefon followed the first-order reaction kinetic behavior, with the rate constants ranging from 0.0027 to 0.0128 min-1 under the studied conditions. The photolysis of triadimefon was slower in natural seawater than in distilled water or synthetic seawater. All the heavy metal ions studied in this paper had inhibition effects on the photolysis of triadimefon. Acetone, as a common photosensitizer, could accelerate the photolysis of triadimefon. Three photoproducts were identified by GC-MS analysis. Our study confirmed that photochemical degradation is an effective pathway to remove triadimefon in seawater.
文摘The ability of triadimefon （TDM）, a triazolic fungicide, to alter the biochemical constituents and thereby minimizing the days required for sprouting in white yam （Dioscorea rotundata Poir.） tubers during storage under （30±2） ℃ in the dark, was studied. TDM at 20 mg/L was given to tubers by dipping the tubers in treatment solution containing 20 mg/L TDM on 10, 25 and 40 d after storage （DAS）. Starch, sugars, protein, amino acid contents as well as protease and a-amylase activities were estimated on 15, 30 and 45 DAS from two physiological regions viz., apical and basal regions of the tubers. In normal conditions （control） sprouting occurred on 70 to 80 DAS. The starch content decreased, while protein, amino acid, sugar contents and protease and a-amylase activities were increased due to TDM treatment and led to early sprouting.
文摘This paper explored the control efficiency of 36% Carbendazim triadimefon SC on wheat powdery mildew, wheat pink mold and rope sclerotinia, and the impact on rape yield through field experiment. The results showed that the control efficiency was the best on the 7th and 14th day after the application of 36% Car- bendazim triadimefon SC in the dosage of 2 250 mL/hm2, and rope yield was improved by 32%.
基金supported by earmarked fund for the National Natural Science Foundation of China(31701379)China Agriculture Research System(CARS-04)。
文摘The present study showed that pretreatment of triadimefon(TDM),a triazole compound,could improve tolerance of soybean seedlings to subsequent water stress.TDM pretreatment resulted in early and late rise in superoxide dismutase(SOD)and catalase(CAT)activities,and upregulation of ascorbate(As A)content in non-stressed and water-stressed seedlings,leading to late increase in net photosynthetic rate(Pn),late decrease in hydrogen peroxide(H2O2)and electrolyte leakage in stressed ones.These TDM-induced changes were blocked by application of abscisic acid(ABA)biosynthesis inhibitor tungstate,which inhibited early rise of ABA and H2O2contents in non-stressed and stressed seedlings.However,ABA pretreatment overcomed the effects of this inhibitor.Application of NADPH oxidase inhibitor diphenyleneiodonium(DPI),polyamine oxidase(PAO)inhibitor 2-hydroxyethylhydrazine(2-HEH)and H2O2scavenger dimethylthiourea(DMTU)prevented early TDM-induced rise of H2O2content.DPI,2-HEH and DMTU also decreased SOD,CAT and As A levels,but did not affect ABA content during early and late phases in both seedlings pretreated with TDM.In addition,these chemicals decreased Pn,and increased H2O2content and electrolyte leakage during late phase in TDM-pretreated stressed seedlings.Overall,these results indicated that TDM pretreatment alleviated adverse effects of water stress on soybean seedlings,which was at least in part,due to increase of antioxidant capacity and decrease of oxidative damage induced by early ABA-dependent H2O2generation.
文摘对Triad im efon在土壤中的降解和吸附行为进行了研究。两年的大田试验结果表明Triad im efon在红壤中半衰期分别为3.68d和8.77d,水稻土中分别为3.69d和7.63d,其降解受温度影响较大。批量法研究的Triad im efon在四种土壤中的吸附行为的试验结果表明Triad im efon在土壤中的吸附符合Freund lich经验公式;Kd随土壤有机质含量的增加而增大,吸附性与土壤有机质含量呈正相关;土壤有机质吸附常数Koc为259,表明Triad im efon在土壤中的移动性为中等:在土壤中的吸附量随温度的升高而降低,在土壤中的吸附主要为物理吸附。
