Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, 110 012, India.
Bull Environ Contam Toxicol. 2019 Sep;103(3):484-489. doi: 10.1007/s00128-019-02686-y. Epub 2019 Aug 9.
Burning of wheat and rice straw on field, after crop harvest, is a quick, cheap and an easy way for land clearing. The ashes generated after burning are mixed with soils and due to their alkaline nature, they may affect the degradation of applied herbicides. Therefore, present paper reports degradation of sulfosulfuron in aqueous suspension of the wheat (WSA) and rice (RSA) straw ashes. The results suggested that both ashes significantly enhanced sulfosulfuron dissipation in water and effect was more with the RSA. The solution pH affected sulfosulfuron dissipation and in control buffers (no ash) herbicide degradation followed the order: acidic > alkaline > neutral. Addition of the RSA significantly increased sulfosulfuron degradation in buffers, but effect was more evident at neutral and alkaline pH. The study has relevance in assessing degradation of sulfosulfuron in soils where crop residues are burned for land clearing.
作物收获后，在田间焚烧麦秸和稻草是一种快速、廉价且简便的土地清理方式。燃烧后产生的灰烬与土壤混合，由于其碱性，可能会影响施用到土壤中的除草剂的降解。因此，本文报道了在小麦（WSA）和水稻（RSA）秸秆灰的水悬浮液中，磺酰脲的降解情况。结果表明，两种灰烬都显著促进了磺酰脲在水中的消解，且 RSA 的效果更为显著。溶液 pH 值影响磺酰脲的消解，在对照缓冲液（无灰）中，除草剂的降解顺序为：酸性>碱性>中性。添加 RSA 显著增加了缓冲液中磺酰脲的降解，但在中性和碱性 pH 值下效果更为明显。该研究在评估因土地清理而焚烧作物残体的土壤中磺酰脲的降解时具有重要意义。
