摘要
试验对低、中、高3个种植密度下夏播玉米CF008、郑单958和金海5号产量形成的源库关系进行了研究,明确不同株穗型品种在较高的种植密度下限制产量的主要因素。结果表明,3个夏玉米品种均在低中密度下冠层透光率较高,源库性能较优。在低中密度下LAI发展动态合理,叶片Pn较高,并且在中密度下群体粒数、群体粒重和子粒品质较高。早衰型品种CF008成熟期粒叶比随密度增加而增加,高密度下源不足是限制产量的主要因素。保绿性较好的品种金海5号粒叶比随密度增加而降低,高密度下库容不足是限制产量的主要因素。郑单958中密度下成熟期LAI、粒叶比和子粒产量均较高,源库关系协调,但在低密度和高密度下均表现为库容不足。
The experiment was employed with main plot of plant density（low, medium and high respectively）, sub-plot of cultivar（CF008, Zhengdan 958 and Jinhai No.5 respectively）, and studied the relationship of source-sink on three summer maize cultivars. The clear objective was the limiting factor for grain yield of different cultivars under high planting density. The main results showed that percent transmission and Pn of middle and upper layer leaf were high, and LAI developmental dynamic were rational because of the even light distribution within canopy under both low and medium densities. Population grain number, population grain weight, and grain quality were high under medium density. Sink number was larger than source at maturity stage for premature senility cultivar CF008, so the limiting factor for grain yield was source not sink. While Jinhai 5 was opposite, and source number was larger than sink when increasing planting density and N rate, so the limiting factor for grain yield was sink not source. The relation of source-sink was coordinated for Zhengdan 958 under low and medium density, but with further increasing of planting density, sink number was larger than source. So the limiting factor for grain yield was source for Zhengdan 958 under high density.
出处
《玉米科学》
CAS
CSCD
北大核心
2008年第4期66-71,共6页
Journal of Maize Sciences
基金
国家科技攻关计划“粮食丰产科技工程”项目(2006BAD02A13-2-1)
北京农业育种基础研究创新平台项目
关键词
夏玉米
密度
源库关系
Summer maize
Density
The relationship of source-sink
