Carry-over Effect of Sulfosulfuron Applied to Wheat on the Succeeding Crop of Cotton

摘要

Cotton (Gossypium hirsutum) is a very important crop in the south-western districts of Punjab where the farmers generally adopt cotton-wheat rotation. Phalanx minor (Gullidanda/sitti), Avena ludoviciana (Wild oat/jaundhar) and other broadleaf weeds are the major problematic weeds of wheat crop. Generally, farmers use sulfosulfuron to control these weeds, which belongs to sulfonylurea group of herbicides and it is considered to be very long residual group of herbicide. Continuous Use of single herbicide may lead to build up of.residues in the soil which may harm the succeeding crop. Walker et al. (1989) also reported that sulfonylurea group of herbicides are highly persistent in soil and may cause residual effect on the succeeding crops like sugerbeet, red beet, lucerne, etc. Studies were thus planned on the field of farmers in the cotton belt of Punjab by keeping permanent layout to see the residual effect of sulfosulfuron applied to wheat.