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首页> 外文期刊>Indian Journal of Weed Science >Leaching behaviour of four herbicides in two soils of Kerala
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Leaching behaviour of four herbicides in two soils of Kerala

机译：四种除草剂在喀拉拉邦两种土壤中的淋溶行为

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摘要

The present study was conducted to find out the extent of leaching of butachlor, pretilachlor, 2,4-D and oxyfluorfen in two soil types, viz. Type I [coarse textured low organic matter soil (Mannuthy-Ultisol] and Type 11 [fine textured high organic matter soil (Alappad-Inceptisol]. Intact soil columns were collected from the paddy fields after the harvest of second crop. Butachlor, pretilachlor, 2,4-D and oxyfluorfen were applied in moist soil columns at the recommended rate of application. Soil samples from different depths up to 10 cm (top 5 segments of 2 cm each) and the leachate at 30 and 60 cm depths were analyzed for herbicide residues using gas chromatography. Among the four herbicides tested, 2,4-D registered highest level of residue in the leachate (0.20 ppm at 60 cm depth). Pretilachlor and butachlor followed the same trend in the pattern of movement of residue through the soil columns. However, the leachate of pretilachlor registered much lower quantity of residue (0.006 ppm). Fine textured organic matter rich soil recorded lower residue levels compared to the soil with coarse texture and poor organic matter. It could be attributed to the high adsorptive power of the soil, especially at the top layers with high organic matter content. Oxyfluorfen residues could not be detected in the leachate, because of its poor water solubility.
机译：进行本研究以找出两种土壤类型中丁草胺，丙草胺，2,4-D和氟苯酚的浸出程度。 I型（粗纹理低有机质土壤（Mannuthy-Ultisol）和11型[细纹理高有机质土壤（Alappad-Inceptisol）。在收获第二批作物后从稻田中收集了完整的土壤柱。丁草胺，丙草胺，将2,4-D和三氟甲苯以推荐的施用率施用到潮湿的土壤柱中，分析不同深度的土壤样品，深度不超过10 cm（顶部5个片段，每个2 cm），并分析30和60 cm深度的渗滤液使用气相色谱法测定除草剂残留量在所测试的四种除草剂中，2,4-D在沥滤液中的残留量最高（60 cm深度处为0.20 ppm）。但是，丙草胺的渗滤液残留量要低得多（0.006 ppm），与质地粗糙且有机质较差的土壤相比，富含细纹有机质的土壤记录的残留水平较低。归因于土壤的高吸附力，特别是在有机质含量高的顶层。由于渗滤液的水溶性差，因此在渗滤液中无法检测到氟草酰残留物。

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