采用二次通用旋转回归组合设计,建立了中熟大豆86-6242产量与密度、播种期、施磷量、施氮量间的数学模型,经优化分析认为:中熟大豆在贵阳地区中等土壤种植,适宜的农艺措施组合为:密度2.0～2.9万株/亩,播种期4月22日～5月2日,施过磷酸钙34.3～49.4公斤/亩,施尿素20.6～24.0公斤/亩;其中,播种期是影响产量最重要的因索,其次是密度。栽培上应着重注意这两因子的调控。 Based on the combination of quadratic universal rotation regression, mathematic models of yield and density, sowing date, phosphorus application rate and nitrogen application rate of medium mature soybean 86-6242 were established. According to the optimized analysis, medium mature soybean was planted in medium soil of Guiyang , The suitable combination of agronomic measures is: density of 2.0 to 29,000 plants / mu, sowing April 22 to May 2, the application of calcium phosphate 34.3 ~ 49.4 kg / acre, urea 20.6 ~ 24.0 kg / acre; of which , Sowing period is the most important factor affecting yield, followed by density. Cultivation should pay attention to the regulation of these two factors.