【摘要】 采用 3因子 5水平最优回归设计方法 ,建立了氮、磷、钾肥与大白菜产量、利润的数学模型。由模型得知 :① 3个因子对产量、利润的影响顺序为磷肥 >氮肥 >钾肥 ;②产量 >975 0 0kg/hm2 ,利润 >14 2 5 0元 /hm2 的优化施肥方案为 :施N 2 71.78～ 3 60 .2 1kg/hm2 ,P2 O5112 .3 5～ 14 6.7kg/hm2 ,K2 O 13 3 .80～ 2 0 6.5 5kg/hm2 。更多还原

【Abstract】 A mathematical model was established by using the best regression design method with three-factors and five-levels.The relations of Chinese cabbage production and its profit to nitrogenous,phosphate and potash fertilizer application was studied.The result shows:the three-factors affected on the Chinese cabbage production and its profit was increasing with the applied order of phosphate, nitrogenous and potash fertilizer;the optimum fertilizer application scheme was N:271.78～360.21?kg/hm 2;P 2O 5:112.35～146.70?kg/hm 2 and K 2O:133.80～206.55?kg/hm 2,so that the production would reach to over 97?500?kg/hm 2 and its profit would reach to over?14?250?yuan/hm 2.更多还原