Inhibitory Effect of Different Rice Varieties on Weeds in Paddy Field

Field experiments were conducted to study the competition between rice and weed,and the differences in inhibitory effects of rice on barnyardgrass [Echinochloa crusgalli(L.)Beauv.],sedge weeds and broadleaf weeds by using 7 rice varieties.The inhibitory effects of Yangdao 6 and PI312777 were 79.74% and 70.26% on weed germination,and 91.84% and 82.94% on weed dry weight,respectively.Xudao 4 could also significantly inhibit weed germination and growth,which led to reduced biomass accumulation of weeds.At the same time,the results showed that the inhibitory effects of the tested rice varieties on the barnyardgrass roots were significantly higher than that on the shoots.The same tendency was found in the inhibitory effect on both total dry weight and shoot dry weight of barnyardgrass.