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采用二次回归正交旋转组合设计方法研究Mg、N、P2O5、K2O施用量与马铃薯生产成本、纯收入及产投比的关系,建立了马铃薯生产成本、纯收入及产投比与Mg、N、P2O5、K2O施用量间的优化数学模型。在对模型进行深入分析的基础上,作了计算机模拟试验,提出了2套马铃薯高产、高效栽培的施肥模型:纯收入高于9 000元/hm2,产投比高于2.21时的施肥量为Mg肥(MgSO2)15.697 5～18.742 5kg/hm2,N肥(纯N)35.100 0～45.137 5 kg/hm2,磷肥(P2O5)97.47～155.52 kg/hm2,K肥(K2O)125.685～149.445 kg/hm2。纯收入高于10 000元/hm2,产投比高于3.0施肥量为Mg肥(MgSO2)16.485～27.765 kg/hm2,N肥(纯N)9.552 5～44.697 5 kg/hm2,磷肥(P2O5)63.585～129.915kg/hm2,K肥(K2O)为102.802 5～173.947 5 kg/hm2。
The quadratic regression orthogonal rotation combination design method was used to study the relationship between the application rates of Mg, N, P2O5 and K2O, the potato production cost, the net income and the production / investment ratio. The production cost, net income and production / , P2O5, K2O dosage optimization mathematical model. Based on the in-depth analysis of the model, a computer simulation experiment was carried out and two sets of fertilization models with high yield and high efficiency were put forward: the net income was higher than 9 000 yuan / hm2, and the fertilization rate Mg fertilizer was 15.697 5 ~ 18.742 5 kg / hm2, N fertilizer was 35.100 0 ~ 45.137 5 kg / hm2, P2O5 was 97.47 ~ 155.52 kg / hm2, K2O was 125.685 ~ 149.445 kg / hm2 . The net income was higher than 10,000 yuan / hm2, and the production / investment ratio was higher than 3.0. The amount of fertilizer was 16.485-27.765 kg / hm2 for Mg fertilizer (MgSO2), 9.552-5.4697.5 kg / hm2 for N fertilizer (pure N), P2O5 63.585 ~ 129.915kg / hm2, K2O was 102.802 5 ~ 173.947 5 kg / hm2.