高产粳型杂交稻寒优1027产量构成指标与相应群体的建成

RESEARCHES ON TARGETS OF YIELD COMPONENT FACTORS AND ESTABLISHMENT OF RELATIVE POPULATION FOR HIGH YIELDING JAPONICA HYBRID RICE HAN YOU 1027

本文通过1988—1989年粳型杂交水稻寒优1027小区与高产示范试验,应用微机分析产量构成因子与产量的关系,结果表明在亩产为600公斤时每亩穗数、每穗结实粒数对产量的作用显著,其增产途径为穗粒并重型。同时,指出相应高产群体建成的主要指标为:基本苗8万左右/亩,最高茎蘖数26—30万/亩;最大叶面积指数8.0左右;齐穗期干重700—800公斤/亩,20—24万穗/亩,实粒数95—115粒/穗,千粒重27克左右。可供粳型杂交稻寒优1027生产应用和参考。

Relationships between yield component factors and yield were analysed by microcomputer through high yielding cultivation experiments of Japonica hybrid rice Han You 1027 during 1988—1989. The result showed that number of ears per unit area and number of fertilized grains per ear had significant contribution on the yield of this hybrid rice at the yielding level of 600kg/mu, and the relative yield-increasing way should be emphasized on these two yield factors. Meanwhile, it also indicated that the major target values of high yielding population should be about 80 thousand seedlings/mu at transplanting stage, 260-300 thousand seedlings/mu at tillering peak stage, about 8 of optimum leaf area index at booting stage, 700—800 kg/mu of dry matter weight at heading stage, and 200—240 thousand ears/mu, 95—115 fertilized grains/ear, about 27 g/1000 grains in yielding composition. These results can be used in high yielding cultivation of Japonica hybrid rice.