【摘要】 通过田间小区试验,采用三因素五水平正交旋转组合设计,研究了红菜园土中氮磷钾肥配比对白菜硝酸盐含量和产量的影响.结果表明,能保证白菜产量为最高理论产量的60%～75%,同时控制其硝酸盐含量为1 600～2 100 mg/kg的最佳氮磷钾肥配比分别为150～180,23～65,92～173 kg/hm2.更多还原

【Abstract】 A field plot experiment with orthogonalty rotational combination design with three factors and five levels was conducted to study the effects of N,P and K fertilizers on the yield of Chinese cabbage and its nitrate content in red garden soil.The results indicated that the optimun combination of the three fertilizers was shown to be in the range of N 150～180 kg/hm2+P 23～65 kg/hm2+K 92～173 kg/hm2,which gave 60%～75% the highest theoretical yields of the crop with 1 600～2 100 mg/kg contents of nitrate.更多还原