1Division of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute, New Delhi-110012
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi-110012
*Address Correspondence: Vijay T. Gajbhiye, Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi-110012, India; Phone: 91-11-25843272 Fax: 91-11-25843272; e-mail: vtg_agchem@iari.res.in
Online published on 31 January, 2015.
Leaching behavior of chlorothalonil, chlorpyrifos and pendimethalinwas studied in Inceptisolwith normal, partially organic matter removed and clay fraction removed soil samples. In normal soil, the pesticidesadsorbed strongly to soil surfaces leading to low leaching. About 84–87% of the added pesticides were confined to the upper soil layer of depth 0–10 cm. In partially organic matter removed soil (about 50%), about 2.5–6% of the pesticides were found in leachates compared to ~2% in normal soil. Clay fraction controls the mobility behavior of pesticides greatly. In partial clay fraction removed soil (about 79%), the leachates were found to contain 5–25% of the added pesticides. Most pronounced effect of clay on leaching was observed in chlorothalonil. Chlorothalonil leached out faster than other compounds in soils in which clay fraction was removed. The organic matter plays a major role in the leaching behavior of pesticides.
Leaching, organic matter, clay, chlorothalonil, chlorpyrifos, pendimethalin, soil column
