氮磷钾肥配施对大白菜产量和品质的影响

Effects of combined application of N,P and K on the yield and quality of Chinese cabbage

采用二次饱和D-最优回归设计(311B方案),对氮磷钾配施与绿星80大白菜的产量、Vc含量、硝酸盐含量的关系进行了研究,并建立了回归模型.结果表明,绿星80大白菜的氮磷钾最佳施肥量为纯N 245～265 kg/hm2,P2O5 158～188 kg/hm2,K2O 150～165 kg/hm2;N,P2O5和K2O的质量配比为1∶0.68∶0.62;此时用回归模型预测的大白菜产量为119 620 kg/hm2,Vc含量为272.14 mg/kg,硝酸盐含量为1 051.67 mg/kg.

An optimal regression design with quadratic effects of N,P and K fertilizers on the yield and quality saturation D （31113 project） was adopted to find of Chinese cabbage through building the models which can demonstrate the relations of fertilization and the yield,vitamin c,nitrate content. The optimum combination of the three fertilizers on the Blue Star 80 Chinese cabbage was shown as the range of N （245-265） kg/hm^2＋P2O3（158-188） kg/hm^2-l-K2O （150-165） kg/hm^2,N：P2O5： K2O=1： 0.68 ： 0. 62.On these conditions,the forecasted yield was 119 620 kg/hm^2,the forecasted content of Vc 272.14 mg/kg and the forecasted nitrate content 1 051.67 mg/kg.