Effect of fertilizer amount on yield and nutrient accumulation of green manures STUDIES ON THE BIOLOGICAL BASES FOR DYNAMICS OF ALOPECURUS POPULATIONS IN WHEAT FIELDS Analysis of allelopathic effects and resource competition of weed suppression ability of wheat (Triticum aestivum) under low nitrogen stress condition Mutation in the acetyl-CoA carboxylase confers resistance to fenoxaprop-P-ethyl in Alopecurus japonicus populations