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本文采用二次通用旋转组合设计的试验方法,研究了白城地区风沙盐碱土壤米薯间作(薯后复种大豆)的大豆丰产栽培数学模型,得出在本试验条件下,大豆1350～1500kg/hm2产量的决策变量是:密度318000～385500株/hm2,肥料(本季不施肥,均利用前茬余肥)二铵前茬施量94.5～106.5kg/hm2的余肥,硫酸钾前茬施量55.5～78kg/hm2的余肥(二铵和硫酸钾均在前茬马铃薯7500～9000kg/hm2所施用二铵112.5～157.5kg/hm2、硫酸钾76.5～102kg/hm2的量内)。三种主要栽培因素贡献率排序为硫酸钾>二铵>密度。单因素密度、二铵、硫酸钾对产量影响显著,二因素密度与硫酸钾互作显著。
In this paper, the mathematical model of high yield cultivation of soybean in sandy soil with saline-alkali soil in Baicheng area was studied by means of quadratic universal rotary combination design. It was found that under the experimental conditions, soybean yield of 1350 ~ 1500kg / hm2 The decision variables of the yield were as follows: the density of 318000-385500 plants / hm2, fertilizers (no fertilizers in this season, both use of the former crop residue fertilizer) diammonium pre-crop application of 94.5 ~ 106.5kg / hm2 excess fertilizer, 55.5 ~ 78kg / hm2 of excess fertilizer (diammonium and potassium sulfate were used in the previous crop of 7500 ~ 9000kg / hm2 diammonium 112.5 ~ 157.5kg / hm2, potassium sulfate 76.5 ~ 102kg / hm2 amount). The contribution rates of the three main cultivation factors ranked as potassium sulfate> diammonium> density. The single factor density, diammonium and potassium sulfate had significant effects on the yield, and the interaction between the two factor density and potassium sulfate was significant.