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在黔中玉米连作种植区域,采用三因素二次正交旋转组合回归设计试验,研究在不同种植密度和施氮量情况下,配合施用复合微肥的农艺效果。结果显示:试验因子对株高、穗粗、穗行数的影响变化不大;而对植株茎粗度、穗长、行粒数、百粒重、产量均有不同程度的影响。建立了产量与密度、氮肥、复合微肥的三元二次回归模型,经解析得到产量大于750 kg/667m2的优化栽培组合方案:种植密度为3 149~3 578株/667m2,施氮量为27.58~34.94 kg/667m2,复合微肥为3 971~4 225 g/667m2。
In the area of continuous cropping of maize in central Guizhou, three-factor quadratic orthogonal rotation combination regression was used to study the agronomic effect of applying compound micro-fertilizer under different planting density and nitrogen application rate. The results showed that the effects of test factors on plant height, ear diameter and ear number did not change much, but had different effects on plant stem diameter, ear length, grain number per line, grain weight per 100, and yield. Based on the ternary quadratic regression model of yield and density, nitrogen fertilizer and compound micronutrient fertilizer, the optimized combination plan with the yield of more than 750 kg / 667m2 was obtained: the planting density was 3 149-3 578 plants / 667 m2, the nitrogen application rate was 27.58 ~ 34.94 kg / 667m2, and compound micronutrient fertilizer is 3 971 ~ 4 225 g / 667m2.