The impact of nitrogen fertilizers on degradation and leaching of chlorotoluron in soil

ISSN： 0306-7319

Source： International Journal of Environmental and Analytical Chemistry, Vol.87, Iss.1, 2007-01, pp. : 67-76

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Abstract

The effect of ammonium sulphate and urea on the degradation and leaching of chlorotoluron in soil was studied under laboratory conditions. The degradation rate of chlorotoluron increased with increasing soil depth. Adsorbed chlorotoluron desorbed readily from subsurface soil because the content of clay and soil organic matter was lower in subsurface soil than in topsoil. After ammonium sulphate and urea were applied to the soil, the degradation of chlorotoluron became slower than that in the untreated soils with fertilizers. Moreover, the degradation of chlorotoluron was faster for all the depths examined with soils amended with urea than for all the depths examined with soils amended with ammonium sulphate. Chlorotoluron was mobile in soils when using non-aged and aged soil columns in different treatments, with mobility increasing in the order ammonium sulphate treatmentsâ–‰<â–‰urea><â–‰control. the="" results="" indicated="" that="" ammonium="" sulphate="" and="" urea="" reduced="" chlorotoluron="" leaching="" losses.="" on="" the="" other="" hand,="" more="" chlorotoluron="" remained="" in="" the="" aged="" soil="" columns="" than="" in="" non-aged="" soil="" columns,="" indicating="" that="" the="" mobility="" of="" chlorotoluron="" decreased="" in="" aged="" treated="">