群体密度对亚种间杂交稻Ⅱ优162产量形成的影响

通过设置９～３６株／ｍ２１０个水平的栽插密度试验，探讨了群体密度对亚种间杂交稻Ⅱ优１６２生长发育与产量形成的影响，结果表明：有效穗数随着栽插密度的增大而增多，穗粒数则相反，产量（Ｙ）与栽插密度（Ｘ）满足Ｙ＝Ｘ３３０６＋５９８６×１０－６×Ｘ１．２２３７２６方程，产量在密度１２～３０株／ｍ２范围内差异不显著，说明亚种间杂交稻Ⅱ优１６２自我调节能力很强；单株分蘖数和成穗率随着群体增大而降低，达到最高苗的时期和有效分蘖终止期随栽插密度增大而提早；抽穗后干物质积累量和ＲＧＲ随密度增大而降低。

EFFECT OF PLANTING DENSITY ON THE GROWTH AND GRAIN YIELD OF INTERSUBSPECIFIC HYBRID RICE-Ⅱ YOU 162

A field experiment of randomized block design with 10 planting densities of 9 to 36 plants/m 2 with the intersubspecific hybrid rice─Ⅱ You 162 was conducted. The results are as the follows. The correlationship between grain yield (Y) and planting densities (X) is fitted in with the regressive equation Y=X3 306+5 986×10 -6 X 1 223726 . There are no significant variance in grain yields under the planting densities from 12 to 30 plants/m 2 .It indicates that the self-regulation and antomatic compensation ability of intersubspecific hybrid rice─Ⅱ You 162 is very great. As the planting density increases, the No.of tillers per plant and percentage of tillers to effective panicles decrease, and the emerging date of the most tillers and the terminative date of effective tiller are postponed, and the amount of dry matter accumulation and RGR after heading stage decrease too.