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应用二次饱和D -最优设计研究了银川平原白菜茬种植水稻的氮磷肥合理施用量。结果表明 ,氮肥是水稻产量构成的主要影响因子 ,施氮肥在株高、穗长、穗粒数、穴穗数等各项生育指标方面都有显著增长 ,但高氮肥力及生育后期连续阴雨天使成穗率和千粒重低 ,实际产量受影响。单施磷肥赔本 ,单施高量氮肥净收益也不高 ,应实行氮磷配合 ,并适量施肥 ,水稻最高产量施氮量为 11.6kg 6 6 6 .6 7m2 ,施磷量为 3.6 4kg 6 6 6 .6 7m2 ;最大利润施氮量为 11.2kg 6 6 6 .6 7m2 ,施磷量为3.17kg 6 6 6 .6 7m2 。
Application of Secondary Saturation D - Optimal Design to Study Rational Application of Nitrogenous and Phosphorus Fertilizers for Growing Rice in Cabbage Stubble of Yinchuan Plain. The results showed that nitrogen fertilizer was the main factor influencing the yield components of rice. Nitrogen fertilizer increased significantly in all growth indexes such as plant height, spike length, grains per spike, and ear hole number. However, high nitrogen fertility and continuous rainy angels Spike rate and grain weight is low, the actual output affected. The single application of phosphorus loss, single application of high net nitrogen fertilizer yield is not high, should be implemented with nitrogen and phosphorus, and fertilization, the highest yield of rice nitrogen fertilizer was 11.6kg 6 6 6 .6 7m2, phosphorus was 3.6 4kg 6 6 6 .6 7m2; the maximum profit rate of nitrogen application is 11.2kg6 6 6 .6 7m2, and the amount of phosphorus application is 3.17kg6 6 6 .6 7m2.