【摘要】 采用三因素五水平最优回归设计 ,研究了贵阳黄泥土施用氮、磷、钾肥对大白菜 (ChineseCabbage)产量和硝酸盐含量的影响。结果表明 ,大白菜高产和低硝酸盐含量的最佳氮磷钾用量为N180～ 2 0 0kg/hm2 ,P2 O512 0～ 15 0kg/hm2 ,K2 O12 0～ 15 0kg/hm2 。更多还原

【Abstract】 An optimized regression design with three factors and five levels was applied to study the effects of N, P and K fertilizers on the yield of Chinese Cabbage and its nitrate content in Guiyang. The optimum combination of the three fertilizers was shown to be in the range of N 180～200kg/hm 2+P 2O 5120～150kg/hm 2+K 2O120～150 kg/hm 2 , which gave high yields of the crop with low contents of nitrate.更多还原