水稻与稗草在大田条件下的竞争关系研究

Studies on the competitive relations of rice and barnyardgrass in fields

不同类型不同密度的水稻与一定密度的稗草混合种植 ,结果表明 :在低密度条件下稗草的生长速率显著高于水稻 ,而在高密度条件下水稻的生长速率显著高于稗草 ;随着种植密度的增加 ,水稻的生长速率逐渐增大而稗草的生长速率逐渐减小。所有条件下稗草的相对生长速率都显著高于水稻的相对生长速率。水稻单位面积产量在试验条件下随水稻密度的增加而增加 ,且差异显著。相对来说 ,稗草对穗重型品种的影响比对穗数型品种的影响更大一些 。

By mixing plantation of barnyardgrass with one density and two types of rice with three densities, it found that the crop growth rate of barnyardgrass was higher than that of rice significantly under low density condition, but the growth rate of rice was higher than that of barnyardgrass significantly under high density. The relative growth rate of barnyardgrass was higher than that of rice significantly under all conditions, and the yield was greater if the plantation was denser.