Effect of Sowing Rate of Wheat on the Weed Community and Wheat Yield

Weeds are potential competitors of the crop for light,water and fertilizers,and also provide host plants for various insect pests,which results in decreased crop yield.In this experiment,wheat cv.Miannong 6 was sown at four different sowing rates in order to highlight the principle of weed occurrence and boost ecological management of weeds.The results showed that the weed community in the wheat field was mainly composed of Alopecurus aequalis,Capsella bursa-pastoris,Rorippa indica and Oenanthe benghalensis.Lower sowing rate(4.47 g/m2) of wheat increased the biomass of weeds,while higher sowing rate(17.88 g/m2) of wheat inhibited the germination and growth of weeds.The sowing rates of 8.94×103 kg/m2 and 13.41×103 kg/m2 proved to be suitable,for they helped to improve the ecological management of weeds in the field and achieve relatively high economic yield of wheat with reasonable production cost.