种植密度与氮肥施用对中低产田玉米产量的影响

以影响黑龙港区夏玉米产量较大的种植密度、N肥施用量、施肥时期为决策变量,采用三元二次正交旋转组合设计进行研究。明确了该区夏玉米≥6750kg/hm~2的技术措施优化组合:种植密度52500～58200株/hm~2,纯N施肥量165～285kg/hm~2,追肥时期应在出苗后17～26d。三因素对产量的作用大小依次为种植密度>N肥追施量>追肥时期。因素问的交互作用均表现为正效应,即密度、施N量、施肥时间偕同变化,有利于产量提高。

Effect of Plant Density and N-fertilizer Application on Maize Yield in Medium and Low Productive Soil

The relationship between the yield of summer maize and plant density, N-fertil-izer application and time of application was studied in Heilonggang area. The results showed that in this area the combination of following technical measures, that is to say the plant density 52, 500-58, 200 plants/hm2 , the net N application 165-285 kg/hm2, and the application time 17-26 d after shooting, should be adopted for the yield of summer maize reaching to 6, 750 kg/hm2 or more. The effect of the three factors on yield is in turn plant density, quantity of N-fertilizer application, and application time. The interaction of the factors is positive, i. e. plant density, quantity of N-fertilizer and time of application cooperate with each other for the yield increase.