In searching for high yield cultivation techniques for a new vegetable soybean variety, Maodou 3, a mathematical model was established. Correlation between the soybean yield and its major agronomic measures, including N, P2O5, K2O applications and planting density, was studied using a quadric universal rotation design. The results showed that N had the greatest effect on yield among different ferlizers, with a maximum seed yield of 10 509.54 kghm-2 at 225.0 kghm-2 N fertilization. At the same application level, K2O yielded 10 473.44 kghm-2. Within a certain range, increased P2O5 produced higher yield, but the yield declined beyond that range. Higher planting density resulted in lower yield due to the prominant branching characteristics of the cultivar. Therefore, it was important to control the planting density. According to the mathematic model, the optimized agronomic measures for top yield(10 000 kghm-2)were: 130.05-147.80 kghm-2 N, 284.27-313.97 kghm-2 P2O5, 144.77-161.03 kghm-2 K2O and (20.15-21.33)104 plantshm-2.
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