密度和追肥量对玉米产量的影响

采用二次旋转回归组合设计，以玉米品种东庆1号、本育9号、东农250、东农0304和东农252为试验材料，研究了它们在密度为37500-67500株·hm^-2，追肥量为75-225 kg·hm^-2范围内的产量变化规律。结果表明：不同玉米品种适合其种植的密度和追肥量不同；东庆1号和东农252密度和追肥量的变化对其产量的影响较大，其他3个品种密度和追肥量的变化对其产量影响不大。确定了5个品种的密度和追肥量的最佳组合方案，建立了5个品种密度和追肥量变化与产量关系的回归模型。

Effect of Density and Additional Fertilizer Amount on Maize Yield

Taking maize variety Dongqing No. 1 （ DQ1 ）, Benyu No. 9 （ BY9 ）, Dongnong 250 （ DN250 ）, Dongnong0304（DN0304）and Dongnong 252（DN252） as test materials, using the quadratic rotator regress combination design of two factors and five levels,the rule of yield change under planting density of 37 500-67 500 individual plant·hm^-2 ,fertilizer capacity of 75-225 kg·hm^-2 was studied. The results indicated that different maize variety needed different planting density and fertilizer capacity,by which the yield of DQ1 and DN252 were affected greatly,the best planting density and fertilizer combination scheme of those 5 maize varieties was proposed,and it also constituted the regress model of the relationship between maize yield and the change of planting density and additional fertilizer amount.