National Research Centre for Weed Science, (Indian Council of Agricultural Research), Jabalpur, MP 482004, India.
Bull Environ Contam Toxicol. 2009 Dec;83(6):799-802. doi: 10.1007/s00128-009-9822-5.
Among sulfonylurea herbicides, metsulfuron-methyl [methyl 2-(4-methoxy-6-methyl-1,3,5-triazine-2-ylcarbamoylsulfamoyl) benzoic acid] is widely used due to its selectivity against a wide range of weeds in cereal, pasture, and plantation crops. Use of persistent herbicides has increased risk of accumulation of residues in soil, groundwater, crop produce, food chain etc. Thus an experiment was conducted to see persistence of metsulfuron-methyl in paddy field under tropical conditions. Metsulfuron-methyl was applied at 2, 4, 5, and 8 a.i. g ha−1 rates after 25 days in transplanted rice as post emergence herbicide. Concentration of metsulfuron-methyl in soil at 30 days was found 0.008, 0.010, 0.011 and 0.016 μg g−1 at 2, 4, 5 and 8 g a.i. ha−1 application rates, respectively. However, residue level of metsulfuron-methyl in soil, rice grains and straw at harvest was found below 0.001 μg g−1.
在磺酰脲类除草剂中，甲磺隆-甲酯（甲基 2-（4-甲氧基-6-甲基-1,3,5-三嗪-2-基氨基甲酰基磺酰基）苯甲酸）因其对谷物、牧场和种植园作物中多种杂草的选择性而被广泛使用。持久性除草剂的使用增加了土壤、地下水、作物产量、食物链等中残留积累的风险。因此，进行了一项实验，以观察在热带条件下稻田中甲磺隆-甲酯的持久性。在移栽水稻后 25 天，作为苗后除草剂，以 2、4、5 和 8 a.i. g ha−1 的剂量施用甲磺隆-甲酯。在 30 天时，分别在 2、4、5 和 8 g a.i. ha−1 的施用量下，土壤中甲磺隆-甲酯的浓度为 0.008、0.010、0.011 和 0.016 μg g−1。然而，在收获时，土壤、水稻籽粒和稻草中甲磺隆-甲酯的残留水平均低于 0.001 μg g−1。
