Singh Ningthoujam Samarendra, Mukherjee Irani, Das Shaon Kumar, Varghese E
Division of Agricultural Chemicals, IARI, New Delhi, 110012, India.
ICAR National Organic farming Research Institute, Tadong, Gangtok, Sikkim, 737102, India.
Bull Environ Contam Toxicol. 2018 Apr;100(4):553-559. doi: 10.1007/s00128-018-2290-z. Epub 2018 Feb 12.
Clothianidin is a widely used insecticide under Indian subtropical condition. The objective of this study was to generate residue data which aims to understand leaching potential of clothianidin [(E)-1-(2-chloro-1,3-thiazol-5-ylmethyl)-3-methyl-2- nitroguanidine] through packed soil column. The maximum amount of clothianidin was recovered at 0-5 cm soil depth in both Manipur (67.15%) and Delhi soil (52.0%) under continuous flow condition. Manipur and Delhi soil concentrated maximum residue with or without farm yard manure (FYM) in 0-20 cm soil depth. The effect of varying the amount of water enhanced the distribution of residues in the first 0-5 cm layer. Among the tested soils, residue was detected in the leachate from Delhi soil (0.04 µg/mL). Clothianidin leaching was minimized in soil of Manipur compared to Delhi after incorporation of FYM. As the volume of water increased upto 160 mL, mobility increased and residues moved to lower depth. Clothianidin did not leach out of the 25 cm long soil columns even after percolating water equivalent to 415.42 mm rainfall. Clothianidin is mobile in soil system and mobility can be reduced by organic amendment application.
噻虫胺是一种在印度亚热带条件下广泛使用的杀虫剂。本研究的目的是生成残留数据，旨在通过填充土壤柱了解噻虫胺[（E）-1-（2-氯-1,3-噻唑-5-基甲基）-3-甲基-2-硝基胍]的淋溶潜力。在连续流动条件下，曼尼普尔邦（67.15%）和德里土壤（52.0%）中，噻虫胺的最大含量在0-5厘米土壤深度处被回收。曼尼普尔邦和德里土壤在0-20厘米土壤深度处，无论有无农家肥（FYM），都集中了最大残留量。改变水量的影响增强了前0-5厘米层中残留物的分布。在测试的土壤中，德里土壤的渗滤液中检测到了残留物（0.04µg/mL）。与德里相比，加入农家肥后，曼尼普尔邦土壤中噻虫胺的淋溶最小化。随着水量增加到160毫升，迁移率增加，残留物移动到更低深度。即使在渗透相当于415.42毫米降雨量的水之后，噻虫胺也没有从25厘米长的土壤柱中淋出。噻虫胺在土壤系统中具有流动性，通过施用有机改良剂可以降低其流动性。
