苏玉30适宜的种植密度及氮肥施用量

摘要

The mathematical models between pure nitrogen application rate, planting density and yield are established by the quadratic regression orthogonal design respectively and the suitable planting density and nitrogen application rate for high-yield cultivation of Suyu 30 were optimized by the mathematical models to provide a reference for high-yield cultivation of Suyu 30 (a maize variety) under the specific ecological conditions in Spring maize cultivation area of Jiangsu.Results: The effect of planting density on yield and yield correlated characters is higher than nitrogen application rate.The population quality indexes of ear-grain structure, leaf area index, photosynthetic potential after flowering, grain storage capacity and ear traits of Suyu 30 under the condition of high-yield cultivation are put forward.The cultivation scheme for more than 9 000 kg/hm2 includes 72 180~88 425 plants/hm2 of planting density and 309.0~370.5kg/hm2 of pure nitrogen application rate.%为江苏春玉米区特定生态条件下苏玉30的春季高产种植提供参考,采用二次正交回归组合设计方法,以施氮量和种植密度为试验因子,建立纯氮用量、密度与产量关系的数学模型,并模拟优选出苏玉30的适宜密度和氮用量.结果表明:密度对苏玉30产量及相关性状的影响均大于施氮量;提出苏玉30高产条件下单位面积的穗粒结构、叶面积指数、花后光合势、籽粒库容量、穗部性状等群体质量指标;得出苏玉30产量≥9 000 kg/hm2的栽培方案:种植密度72 180~88 425株/hm2,纯氮用量309.0~370.5 kg/hm2.