CHEMICAL CONTROL OF ANNUAL RYEGRASS GROWING WITH BARLEY DURING PRE-EMERGENCE STAGE BY METHABENZTHIAZURON, ISOPROTORON AND CHLOROTOLURON

摘要

Treatments by three herbicides named; Methabenzthiazuron, Isoprotoron and Chlorotoluron to control Italian ryegrass growing with barley during pre-emergence stage were investigated. Results showed that clear damage have been occurred by the three chemicals without prominent effect on barley plants. Italian ryegrass was controlled significantly (p0.01) by all of the herbicides used but the three herbicides differed significantly (p0.05) in their effects. Chlorotoluron gave effective control of Lolium multiflorum at dose of 2kg a.i/ha and slight damage on barley was observed. Isoproturon and methabenzthiazuron were less effective as more than 40 of Lolium multiflorum survived at different doses while barley was not affected significantly.