种植密度对先玉335群体子粒灌浆特征的影响

2008年在高产田内较大密度处理范围(22500、45000、67500、90000、112500株/hm2)分析玉米品种先玉335群体子粒灌浆特征及其与产量的关系。结果表明:高产密度群体(90 000株/hm2)产量显著高于低密度(22500株/hm2)和超高密度(112500株/hm2)群体。各密度下群体子粒灌浆过程均可用Logistic方程模拟。高产密度的群体子粒平均灌浆速率、最大灌浆速率显著高于低密度、超高密度。不同密度群体子粒活跃灌浆期差异不显著。相关分析表明,群体子粒灌浆速率是影响产量的主要因素。进一步分析表明,对产量影响最大的是粒重渐增期的群体子粒灌浆速率,其次为线性灌浆期的群体子粒灌浆速率,后者与前者呈显著正相关关系。因此,提高粒重渐增期的群体子粒灌浆速率对提高群体产量尤为重要。

Effects of Planting Densities on Population Grain Filling Characteristics of Maize Hybrid Xianyu335

The relationships between characteristics of population grain filling and yield were studied within a wide range of density(22 500, 45 000, 67 500, 90 000, 112 500 plants/ha) for maize hybrid Xianyu335 on high-yielding field in 2008. The results showed that the yield of high-density population(90 000 plants/ha) was the highest. The Logistic equation could be used to simulate population grain filling process of different density populations. The maximum population grain-filling rate, mean population grain-filling rate of high-density population(90 000 plants/ha) were significantly higher than low-density population(22 500 plants/ha) and highest-density population(112 500 plants/ha). The active population grain filling period was not significantly different among different density treatments. Correlation analysis suggested the population grain filling rate was the main factor affecting maize yield. Population grain filling rate at early grain development perio(P₁) played more important role for the yield, followed by the population grain filling rate at linear growth perio(P₂). P₁ and P₂ correlated positively and significantly. Therefore increasing P₁ is the key for high yield.