The effects of organic amendments and sulfosulfuron application rates on its persistence in soil

Document Type : Research Article

Abstract

Persistence behavior of sulfosulfuron in soil was studied under wheat cropping conditions at the
Research Field of Faculty of Agriculture, Ferdowsi University of Mashhad in 2006. Forty ton ha-1
animal manure was applied to the soil and a none applied manure was allocated as check. Two doses of herbicide application, common (26.6 g ha-1) and overdose (33.73 g ha-1) also were sprayed. Soil samples were collected at predetermined intervals after herbicide application and residues of sulfosulfuron were analyzed by HPLC using photodiode array detector. The method was set by using RP-C8 column (250×4.6 mm) and acetonitril: water: orthophosphoric acid (80:20:0.1 v/v/v) as mobile phase at a flow rate of 1 ml min-1 with 20 μl injection volume and 212nm as maximum absorbance wave length. In this condition sulfosulfuron was resolved at 3.6 min retention time. The dissipation of sulfosulfuron was found to have first-order kinetics in soil and its rate was faster in the amended soil than another. The half-time (t0.5) decreased from 33.8 days to 14.3 days and 25 days to 13.3 days in common and overdose of sulfosulfuron respectively. These quantities for t0.1 (90% reduction in initial
herbicide concentration) were from 112.2 days to 47.6 days and 83.2 days to 44.2 days.

20.1001.1.20081472.1388.7.1.30.8

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