Abstract: Field experiments were conducted to study the competition between rice and weed, and the differences in inhibitory effects of rice on barnyardgrass \[Echinochloa crusgalli(L.) Beauv.\], sedge weeds and broadleaf weeds by using 7 rice varieties. The inhibitory effects of Yangdao 6 and PI312777 were 79.74% and 70.26% on weed germination, and 91.84% and 8294% on weed dry weight, respectively. Xudao 4 could also significantly inhibit weed germination and growth, which led to reduced biomass accumulation of weeds. At the same time, the results showed that the inhibitory effects of the tested rice varieties on the barnyardgrass roots were significantly higher than that on the shoots. The same tendency was found in the inhibitory effect on both total dry weight and shoot dry weight of barnyardgrass .

Key words: rice variety, inhibitory effect, allelopathy, weed

摘要： 选择江苏主栽水稻品种5个，以及具有化感特性的PI312777和华抗草78为试验材料，通过田间小区试验对比各水稻品种与稗草、莎草科杂草和阔叶杂草的生态竞争关系。结果表明,扬稻6号和PI312777对杂草发生株数的抑制率达70%~80%，扬稻6号、徐稻4号和PI312777对杂草干质量抑制率超过80%，具有良好的抑制杂草萌发、生长和干物质积累的作用。 同时，供试水稻品种对稗草地下部的抑制效果显著优于对稗草地上部的抑制效果，对稗草整株干质量的抑制率与对稗草地上部干质量抑制率呈相同趋势。

关键词: 水稻品种, 抑制作用, 化感作用, 杂草