Tolerance of different soybean cultivars to contact herbicides

Glufosinate and paraquat tolerance of four soybean cultivars' leaves were studied by using pipette spotting.It was found that different cultivars showed varying tolerance to the herbicides.The tolerance thresholds to paraquat in Xiaolidou and Dongnong 50 were 0.12mg/L,whereas in Zhongdou 32 and Zhonghuang 10 they were 0.24mg/L and 0.18mg/L respectively.Similarly,there was a different level of glufosinate tolerance among 4 cultivars.The tolerance thresholds to glufosinate in Zhonghuang 10 and Dongnong 50 were 3mg/L,whereas in Zhongdou 32 and Xiaolidou they were 6mg/L and 4mg/L,respectively.