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试验结果表明，与常规稻相比，稗草具有一般杂草的生长特性，即具有前期生长优势、后期生长劣势之特性。这与稗草从种子萌发至三叶期前的异养阶段，植株体内α淀粉酶活性强和自养阶段初期叶片净同化率高有关。但杂交稻在种子萌发期间（３１２ｄ）和大田自养阶段叶片净同化率均显著高于常规稻和稗草，具有较强的种间竞争优势，特别是在水稻与稗草生长初期，这种种间竞争优势更加明显，表明杂交稻的产量优势也与其它作物—杂草生态系统中保持较强的竞争优势有关。
The results showed that compared with conventional rice, barnyardgrass possesses the growth characteristics of common weeds, that is, it has the characteristics of early growth and later growth. This is the barnyard grass germination from the seed to the three-leaf stage before heterotrophic stage, the plant α-amylase activity and autotrophic stage of early leaf net assimilation rate is high. However, the net assimilation rate of hybrid rice was significantly higher than that of conventional rice and barnyard grass during seed germination (312d) and autotrophic stage of hybrid rice, which had a strong interspecific competitive advantage, especially in the early growth of rice and barnyardgrass The competitive advantage is more obvious, indicating that the yield advantage of hybrid rice is also related to the strong competitive advantage in other crop-weed ecosystems.