摘要： 采用三因素二次饱和D-最优设计方法，研究了春玉米子粒建成期间子粒干重的变化及播期、密度、施氮量对其影响，阐明了春玉米子粒建成期间干物质积累S形曲线的数量变化。通过聚类分析可划分为指数增长期授粉后19天内）,直线增长期授粉后20～43天）,缓慢增长期授粉44天至成熟）;子粒干物质增长速度为单峰曲线，但播期晚、高密度、高施氮量处理下峰值较小，峰值之后干物质积累速度下降快；晚播处理下子粒子物质积累的指数增长期延长，直线增长期缩短，产量显着下降。

关键词: 春玉米, 子粒, 干物质

Abstract: The method of three factors guadratic Saturation D-opeimum design was adopt in this e;;periment. The kernel dry matter change regularity in kernel establishment period ofspring maize and the influency of seeding date, density, nitrogen application on kernel estab-lishment were studied. The results showed that the dry matter accumulation procedure in ker-nel establishment is as "S"curve. By cluster analysing, the kernel establishment procedure aredivided into exponential-grow period 19 days after pollination), linear-grow period2o--43days after pollination), slow-grow period 44 days after pollination until harvesting period).The rate of kernel dry matter accumulation showed a single peak curve, but the peak value oflater seeding date, high density, high fertilizer application quantitation was smaller. In thelater period,the rate of kernel dry matter accumulation decreased quickly., The Exponential-grow period of kernel dry matter accumulation was prolonged at treatment oflater seeding date, its linear-grow period is shorten, and yield cut down.

Key words: Spring maize, Kernel, Dry matter

中图分类号: 

• S513.01