直播密度对常规早稻产量性状及冠层结构的影响  

Influence of Planting Density on Yield Traits and Canopy Structure of Direct-seeding Early Rice

作　　者：方宝华 张玉烛 何超 

机构地区：[1]湖南省水稻研究所,长沙410125 [2]湖南省农业委员会,长沙410005

出　　处：《中国稻米》2015年第4期155-159,共5页China Rice

基　　金："十二五"科技支撑计划重大项目;粮食丰产科技工程"湖南双季稻大面积均衡增产技术集成研究与示范"(2012BAD04B10)

摘　　要：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/hm^2时,能获得较高的有效穗数（480-525万/hm^2）,结实率75%左右,产量6 300-6 750 kg/hm^2,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/hm^2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/hm^2）, seed setting rate（about 75%）, yield（6 300-6 750 kg/hm^2）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.

关 键 词：水稻 直播 密度 冠层结构 产量 

分 类 号：S511.042[农业科学—作物学]