Study on the Safety of Soil Closure Treatment with Four Herbicides on Astragalus sinicus after Rice and Its Control Effect on Broad-leaved Weeds
In order to screen the herbicides used in soil treatment to control broad-leaved weeds in the breeding field of Astragalus sinicus after rice,4 herbicides including 80％flumetsulam water dispersion granules,960 g/L S-metolachlor emulsifiable concentrate,33％S-metolachlor·flumioxazin microcapsule suspension and 330 g/L pendimethalin emulsifiable concentrate were selected and soil spray treatments were applied before seedling emergence of Astragalus sinicus,and their safety and control effect on broad-leaved weeds were evaluated.Results showed that soil spray on the second day after sowing Astragalus sinicus,80％flumetsulam water dispersing granules and 330 g/L pendimethalin emulsifiable concentrate were safe for Astragalus sinicus and had the best control effect on broad-leaved weeds in the field,plant control efficiency were 75.26％,82.74％,respectively,whereas fresh weight control efficiency were 46.09％,61.09％,respectively.
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