Residual effect of wheat applied sulfonylurea herbicides on succeedingcrops as affected by soil pH

摘要

Study was conducted at Punjab Agricultural Univeristy, Ludhiana to find the residual effect of sulphonylurea herbicdes, applied on wheat on the suceeding crops. The application of sulfonylurea herbicides proved quite effective against Phalaris minor in wheat crop without causing any toxicity to the crop. These herbicides being persistent in nature did not have same residual toxicity to most of the crops grown in succession except in mung and maize where growth and development was adversely affected.The other crops like rice and cotton grew well and did not exhibit any toxicity due to various sulfonylurea herbicides viz., sulfosulfuron and mesosulfuron + iodosulfuron. fresh weight of maize was significantly more in normal pH soil than high pH soil which indicates that herbicides persist longer in high pH soil and cause 8.1% reduction in fresh weight of maize in high pH soil.