密度对不同类型玉米源库关系及产量的调控

The regulation and control of density on relationship of sink-source and yield of different maize

通过对不同类型玉米品种在 4个不同生态条件下的密度定额试验发现 ,随着密度的增加 ,群体库源也随着增加 ,但两者增加幅度不同 ,群体库的增加幅度超过群体源的增加幅度。高密度下群体源不足是产量提高的主要限制因素 ,保证一定总粒数 ,增加吐丝后干物质积累量 ,提高成粒率 。

The density test in different variety maize was studied under 4 different environment.The results showed that population sink source increased with density increasing,but the two increasing rangs were different,population sink increased larger than that of source.It is main limited factor of high yield that population source was shortage.The key of maize gain high yield is ensuring plentiful sum grain numbers,enhancing dry matter accumulation after silking stage,increasing rate of grain formed,boosting up source and enlarging sink.