【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，产量显著下降。更多还原

【Abstract】 The method of three factors guadratic Saturation D-opeimum design was adopt in this experiment.The kernel dry matter change regularity in kernel establishment period of spring maize and the influency of seeding date,density,nitrogen application on kernel establishment were studied.The results showed that the dry matter accumulation procedure in kernel establishment is as "S" curve.By cluster analysing,the kgrnel establishment procedure are divided into exponential-grow period(19 days after pollination),linear-grow period(20-43days 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 of later seeding date,high density,high fertilizer application quantitation was smaller.In the later period,the rate of kernel dry matter accumulation decreased quickly.The Exponential-grow period of kernel dry matter accumulation was prolonged at treatment of later seeding date,its linear-grew period is shorten,and yield cut down.更多还原