Control Effects of Fomesafen·Clomazone·Clethodim 39% EC Against Annual Weeds in Spring Soybean Fields in Northeast China

In order to clarify the control effect and optimal dosage of fomesafen·flomazone·clethodim 39% EC on annual weeds in spring soybean fields in Northeast China. The field efficacy test was carried out by randomized block test design method. The results showed that at 30 days after treatment, the plant quantity control effects of fomesafen·flomazone·clethodim 39% EC at 611.0, 666.5, 722.0, 1 333.0 g·ha^-1 were 93.9%, 97.0%, 98.7%, 99.6% and the fresh weight effect were 96.0%, 98.3%, 99.1%, 99.8%. The soybean yield increased significantly with increasing rate of 196.2%, 203.8%, 204.9%, 198.1%, respectively. Therefore, fomesafen·flomazone·clethodim 39% EC can be used at 1 to 2 trifoliate leaf stage in soybean field by stems-leaves spraying. It was safe on soybean and control effectively weeds with increasing production.So it can be used as the herbicide in spring soybean fields in Northeast China. The appropriate application dosage of fomesafen·flomazone·clethodim 39% EC was 611.0-722.0 g·ha^-1.