Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi, India.
J Environ Sci Health B. 2010 Oct;45(7):676-81. doi: 10.1080/03601234.2010.502445.
The effect of compost-amendment and moisture status on the persistence of azoxystrobin [methyl (E)-2-{2-(6-(2-cyanophenoxy) pyrimidin-4-yloxy) phenyl}-3-methoxyacrylate], a strobilurin fungicide, in two rice-growing soils was studied. Azoxystrobin is more sorbed in the silt loam (K f – 4.66) soil than the sandy loam (K f – 2.98) soil. Compost-amendment at 5 % levels further enhanced the azoxystrobin sorption and the respective Kf values in silt loam and sandy loam soils were 8.48 and 7.6. Azoxystrobin was more persistent in the sandy loam soil than the silt loam soil. The half–life values of azoxystrobin in nonflooded and flooded silt loam soil were 54.7 and 46.3 days, respectively. The corresponding half–life values in the sandy loam soils were 64 and 62.7 days, respectively. Compost application enhanced persistence of azoxystrobin in the silt loam soil under both moisture regimes and half-life values in non–flooded and flooded soils were 115.7 and 52.8 days, respectively. However, compost enhanced azoxystrobin degradation in the sandy loam soil and half-life values were 59 (nonflooded) and 54.7 days (flooded). The study indicates that compost amendment enhanced azoxystrobin sorption in the soils. Azoxystrobin is more persistent in non-flooded soils than the flooded soils. Compost applications to soils had mixed effect on the azoxystrobin degradation.
研究了堆肥改良和水分状况对两种水稻土中嘧菌酯（甲基（E）-2-｛2-（6-（2-氰基苯氧基）嘧啶-4-基氧基）苯基｝-3-甲氧基丙烯酸酯），一种甲氧基丙烯酸酯类杀菌剂的持久性的影响。嘧菌酯在粉壤土（Kf-4.66）中的吸附量大于在砂壤土（Kf-2.98）中的吸附量。在 5%的水平下添加堆肥进一步增强了嘧菌酯的吸附，粉壤土和砂壤土的相应 Kf 值分别为 8.48 和 7.6。嘧菌酯在砂壤土中的持久性大于粉壤土。非淹水和淹水粉壤土中的嘧菌酯半衰期值分别为 54.7 和 46.3 天。相应的半衰期值在砂壤土中分别为 64 和 62.7 天。堆肥的施用增强了嘧菌酯在非淹水和淹水粉壤土中的持久性，半衰期值分别为 115.7 和 52.8 天。然而，堆肥增强了嘧菌酯在砂壤土中的降解，半衰期值分别为 59（非淹水）和 54.7 天（淹水）。研究表明，堆肥改良增强了土壤中嘧菌酯的吸附。嘧菌酯在非淹水土壤中的持久性大于淹水土壤。堆肥的施用对嘧菌酯的降解有混合影响。
