Effects of Different Pre-Emergence Herbicides in the Fields with Maize-Soybean Intercropping in Southern China
To control refractory weeds in the fields with maize-soybean intercropping in southern China,field experiments were carried out with eight pre-emergence herbicide treatments including single pre-emergence herbicides,combined pre-emergence herbicides,and single pre-emergence herbicide + glyphosate-isopropylammonium.The control effects on the plant number and fresh weight of weeds in the middle and late stages of crop growth were evaluated.The results showed that combined pre-emergence herbicides outperformed single herbicides,and the control effect on fresh weight was greater than that on plant number.The control effects on both plant number and fresh weight,especially that on plant number,decreased over time.On day 97 after herbicide application,the control effect on fresh weight followed the trend of s-metolachlor + glyphosate-isopropylammonium>thifensulfuron-methyl·acetochlor>metolachlor>s-metolachlor>pendimethalin>prometryne·acetochlor>acetochlor,reaching 84.8%,83.04%,81.52%,80.11%,78.36%,77.35%,and 67.54%,respectively.These pre-emergence herbicides can be used in the fields with maize-soybean intercropping in southern China.The application of flumetsulam as a pre-emergence herbicide in southern China remains to be further studied.
pre-emergence herbicidesmaizesoybeancontrol effect on plant numbercontrol effect on fresh weight
NETL
NSTL
万方数据
维普
