研究了新玉9号正交种的密度效应，结果表明：1经济产量—密度方程呈渐近线型，经济系数—密度方程呈指数下降型。
We studied the density on Xinyu no. 9. The result showed that: 1 Economic yield density assume asymptote model; Economic coefficient density, exponential decay curve.
采用二次饱和D—最优设计建立了精播条件下不同类型花生品种N肥用量和密度与产量的数学模型，探讨肥料与密度的产量效应及优化配置。
Mathematic models between yield and N fertilizer and plant density for two peanut variety types were set up by using quadratic saturation D-optimization design under single-seed planting.
采用三因素五水平二次回归正交旋转组合设计，研究玉米品种、密度、施肥措施对西昌地区玉米产量形成的作用效应，建立回归模型并分析各因子的作用规律。
Quadratic orthogonal regressive rotation design of three factors is applied to study the effect of varieties, density and fertilization to maize yield in Xichang ecological area.
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