移栽密度对超级早稻陵两优268生长及产量的影响  

Effects of Transplanting Densities on Growth and Yield of Super Early Rice Lingliangyou 268

作　　者：符辰建[1] 谢小兵[2] 蒋鹏[2] 杨广[1] 彭铁玖 杨远柱[1] 邹应斌[2] 

机构地区：[1]湖南亚华种业科学研究院,湖南长沙410119 [2]湖南农业大学,湖南长沙410128 [3]湖南省粮油作物科技中心,湖南长沙410005

出　　处：《湖南农业科学》2012年第3期17-20,共4页Hunan Agricultural Sciences

基　　金：国家农业科技成果转化资金支持项目(2009GB2D200261);湖南省重大科技专项(2009FJ1004-3);湖南省水稻产业技术体系项目资助

摘　　要：为了探讨超级早稻陵两优268在南方双季稻区适宜的栽培密度,于2011年在湖南长沙以陵两优268为材料进行大田试验,比较了不同移栽密度下陵两优268的生长发育特性及产量和产量构成特点。结果表明:稀植(18.8万穴/hm2、14.0万穴/hm2、10.8万穴/hm2)可以提高分蘖成穗率,有利于花后干物质积累及每穗粒数和结实率的提高,但单位面积有效穗数不足,导致产量不高;与此相反,密植(67.9万穴/hm2、40.1万穴/hm2)因为单位面积有效穗数较多而获得较高产量;适宜密度(26.5万穴/hm2)在保证基本苗的同时,具有适宜的叶面积指数及较小的顶三叶叶基角,并能协调产量构成因子,从而获得最高产量,达8.70 t/hm2。由此可见,在南方双季稻区,陵两优268适宜的移栽密度为26.5万穴/hm2。In order to investigate the suitable planting density for Lingliangyou 268, a super early rice variety, in double rice cropping area in southern China, a field experiment was conducted in Changsha, Hunan Province in 2011. Growth characters yield and yield components of Lingliangyou 268 under different planting densities were compared. The results showed that low planting densities （108, 140 and 188 thousands shoots/hm2） can enhance percentage of productive tillers, post-anthesis dry matter accumulation, spikelets per panicle and seed setting percentage. However, panicles per unit land area under low planting densities were less and resulted in lower grain yields. On the contrary, high planting densities （401 and 679 thousands shoots/hm2） could achieve higher grain yields since they have more panicles per unit land area. The optimum planting density is 265 thousands shoots/hm2, which not only can ensure basic seedlings, but also can have appropriate leaf area index and relatively small basic leaf angle of erect top three leaves and can coordinate yield components to achieve the highest yield of 8.70 t/hm2.

关 键 词：移栽密度 生长发育 产量 产量构成 

分 类 号：S511[农业科学—作物学]