冀西北旱地马铃薯肥料效应数学模型的研究

STUDIES OF THE MATHMATICS MODEL OF FERTILIZER EFFECTS ON NONIRRIGATED POTATO IN NORTHWEST HEBEI

本试验采用正交旋转回归设计的方法，选取氮（ｘ１）、磷（ｘ２）、有机肥（ｘ３）三个因素为决策变量，以马铃薯鲜薯产量为目标函数，通过田间试验获得的数据，建立了冀西北旱地马铃薯产量与参试因子间的数学模型。对模型进行解析的结果表明：施用有机肥对旱地马铃薯增产很重要，但施氮磷化肥也能增产；而且有机肥施用可以促进氮肥的增产效果，降低磷肥的增产效果。最后，通过计算机模拟寻优获得了１５００ｋｇ／６６７ｍ２以上施肥方案。

Using the quadratic orthogonal rotation regressional design method,selecting nitrogen(x 1),phosphate(x 2),and organic fertilizer as decision variables,and taking the yield of fresh potato as target function,we set up the mathmatics model between the potato yield and experimental factors in the nonirrigated land of northwest Hebei based on the data obtained from field experiments.Although organic fertilizer is very important for the potato production,nitrogen and phosphate fetilizers can increase potato yield furthermore.Organic fertilzer can increase the effect of nitrogen fertilizer and decrease the effect of phosphate ferti lzer.Finally,we obtain the optimization scheme of fertilizer uses for the potato production of 22500kg/hm 2 by using computer simulation.