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采用二次回归通用旋转组合设计，研究施氮水平、施磷水平、施钾水平三个因素对杂交早稻威优７７亩产量的回归关系。结果表明：在三个因素中．施氮水平对亩产量的影响最大，以亩施纯氮１５公斤产量最高，５公斤最低。施磷水平对亩产量影响以亩施磷（Ｐ２Ｏ５）６公斤为最高，施钾水平对产量则表现为二次方关系。施氮水平与施磷水平、施钾水平之间存在显著互作关系，低施氮水平下，增施磷、钾增产不显著；高施氮水平下，增施磷、钾可显著增产。
The quadratic regression general rotation combination design was used to study the regression relationship between the nitrogen application rate, the phosphorus application rate and the potassium application rate on the yield of 77 hybrid rice. The results show that: Among the three factors. Nitrogen fertilizer has the greatest impact on mu yield, with 15 kg of pure nitrogen per acre yield the highest, the lowest of 5 kg. Phosphorus level on the yield of mu to phosphorus phosphorus (P2O5) 6 kg for the highest potassium level on the output showed a quadratic relationship. There was a significant interaction between nitrogen application rate and phosphorus application and potassium application. Under low nitrogen application rate, the increase of phosphorus and potassium yield was not significant. Under high nitrogen application rate, phosphorus and potassium application increased significantly.