张掖市地膜玉米产量和经济效益模型的研究

本文对张掖市的地膜玉米采用了通用旋转回归设计方法，研究了密度、氮、磷三因子对地膜玉米产量和经济效益的影响以及因子间的配合关系。根据试验资料，建立了三元二次回归产量和经济效益模型，与实际资料拟合好，达到了极显著水准。并通过对模型的分析，明确了当前生产条件下以高产高效为目标时，各因子适宜用量，明确了三因子在增产增收中的作用是氮肥大于密度，密度大于磷肥。

Yield and Economic Benefit of Corn Ground Covered with Plastic Film in Zhangye City,Gansu Province

Effects of density and nitrogen and phosphate fertilizers on yield and economic benefit of corn ground covered by plastic film and the interrelations of the three factors were studied by revolving regression designed field experiment.Based on the experimental data a regressive yield and economic model were established.Then based on analysis of the model suitable rate of dressing of the two fertilizer at current condition can be determined.It was also concluded that for increasing the corn yield and economic benefit nitrogenous fertilizer is more important than density,and density is more important than phosphate fertilizer.