The Nature and Consequence of Interference Byalopecurus Myosuroideshuds. On the Growth of Winter Wheat

Summary. In a field experiment with different densities of Alopecurus myosuroides , 10 plants/m 2 caused no significant reduction in total dry weight of winter wheat at harvest. When autumn‐ or spring‐germinated plants at 100/m 2 remained until harvest, crop weight was reduced by about 30%. A study of root‐zone competition between A. myosuroides and winter wheat in the glasshouse showed that suppression of the weed by the crop was greater at high nitrogen levels; the practical implications of this are discussed. La nature de l'interférence d' Alopecurus myosuroïdes Huds. sur la croissance du blé d'hiver, et ses conséquences