Influence of barnyardgrass (Echinochloa crusgalli) on the growth of double-cropping paddy rice and its economic threshold Influence of barnyardgrass, Echinochloa crusgalli, on the growth and yield of paddy rice and its economic threshold The movement characteristics of three kinds of weed seeds in ploughed layer of corn field Feedback of abuscular mycorrhizal fungi on interactions between maize/fababean and maize/barnyardgrass IMPROVEMENT OF BARNYARDGRASS POTENTIAL BIOCONTROL FUNGUS BY NTG INDUCING AND~(60)Co γ-RAY IRRADIATION Control of herbicide resistant Echinochloacrusgalli indirect-seeded rice crops EFFECTS OF BARNYARDGRASS ON NITROGEN CONTENT, NITROGEN QUOTA IN ABOVE-GROUND PLANT ORGANS AND SEED PROTEIN YIELD OF SOYBEANS UNDER DIFFERENT WATER STRESS CONDITIONS THE PRESENT SITUATION OF RESISTANCE OF THE BARNYARDGRASS TO BUTACHLOR IN THE RICE PLANTING AREAS IN CHINA Effects of Different Species in Echinochloa on Photosynthetic Characteristics and Grain Yield in Rice under Alternate Wetting and Moderate Drying Condition Biological Traits and Cytology Study of Two Kinds of Barnyardgrass from Cold Areas