京科968的灌浆特征与产量性能分析

Grain Filling Characteristics and Yield Capability Analysis of Jingke968

以京科968为材料,采用春播、夏播2种播期,设置45 000、60 000、75 000株/hm2共3种密度处理,对其灌浆特征与产量性能进行分析。结果表明,粒重与灌浆速率最大时的生长量(Wmax)、最大灌浆速率(Gmax)、活跃灌浆天数(P)呈极显著正相关,与达到最大灌浆速率的天数(Tmax)、灌浆起始势(R0)呈显著或极显著负相关。平均叶面积指数、穗数、产量与密度呈正相关;平均净同化率、穗粒数、千粒重与密度呈负相关;平均叶面积指数与穗数与产量都呈极显著正相关。

The Jingke968 was planted at the density of 45 000 plants/ha, 60 000 plants/ha, 75 000 plants/ha on May 11st and June 19th, respectively. The main objective is to study the grain filling characteristics and yield analysis capability of Jingke968. The results showed that the grain weight was positively related with weight reaching maxium grain filling rate（Wmax）, maximum grain filling rate（Gmax）, active grain filling period（P）, significantly; and negatively related with time reaching maxium grain filling rate（Tmax） and Initial grain filling potential（R0）, significantly. Mean leaf area index, ear number and yield were positively related with density, significantly; and mean net assimilation rate（NAR）, grains per ear and grain weight were negatively related with density, significantly. Mean leaf area index and ear number were positively related with yield, significantly, despite of spring sowing or summer sowing.