以湘早籼45号为材料，研究了不同直播密度下的群体苗数、产量、产量构成和冠层结构变化。结果表明：播种量在97.5~120.0 kg/hm2时，能获得较高的有效穗数（480~525万/hm2），结实率75%左右，产量6300~6750 kg/hm2，具有较高的经济系数，同时提高冠层中上层的覆盖指数，保持中下层充足的光分布量。因此，常规早稻直播生产的用种量以97.5~120.0 kg/hm2较为适宜，有利于构建合理的群体冠层结构，发挥群体增产潜力。%The population of seedlings, yield, yield components and canopy structure changes of Xiangzaoxian 45 (early indica rice) under different direct-seeding density were studied in the paper. The results showed that seeding rate in 97.5~120.0 kg/hm 2 could reach higher effective panicles(4 800~5 250 thousand/hm2), seed setting rate(about 75%), yield(6 300~6 750 kg/hm2) and economic coefficient and increase the covering index of canopy in pelagic, keep sufficient light distributed variables in lower middle class. Based on the research, the most suitable seeding rate of early conventional rice was 97.5~120.0 kg/hm 2 in direct-seeding production, which was help for constructing reasonable canopy structure and exerting population yield potential.
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