旱塬地玉米氮、磷配合旋肥模式化研究

Preliminary Report on Nitrogen and Phosphorus Fertilization Modles for Dryland Corn Production

采用氮、磷化肥两因素二次回归饱和 D—最优设计,通过微机寻优模拟计算,建立了旱塬地玉米施肥—产量模型,筛选出不同亩产量范围的施肥方案36套;建立了旱塬地玉米施肥—增产量模型,筛选出不同亩产量范围的施肥方案36套;建立了旱塬地施肥—玉米水分利用率模型,计算出最高经济施肥量为:碳酸氢铵84.91kg/亩,过磷酸钙54.87kg/亩,可获得最高经济施肥产量为400.23kg/亩,扣除施肥成本,每亩玉米收入139.68元。

This experiment was conducted,by using a two factors(N aud P)quadratic regres- sion saturation D-aptimum design.Models were established through compute optimization for: (1)dryland fertilization and corn yield;(2)dryland corn fertilization and field inerement;(3)dry land corn fertilization and water utilization.36 fertilization schemes were worked out for different rango of desired yields.The maximum amounts of economic fertilization 84.91kg/mu of ammo- nium bicarbonate and 54.87 kg/mu of superphosphate,were determined,with which the maxi- mum economic yield approached to 400.23 kg/mu.After deducting costs of fertilization,139.68 yuan/mu,was obtained.