If the herbicide was used after emergence, the effect of 56% MCPA-sodium wettable powder on broad-leaved weed was higher (92.14%).However, that was lower(-29.7%) to gramineous weed.

• 苗后施药，56%252甲4绿钠可湿性粉剂对阔叶杂草的防效较好，总防效达92.；14%25，但对禾本科杂草的防效较差，总防效为-29