蕹菜平衡施用氮磷钾肥料效应研究

采用“3414”最优回归设计方法，对蕹菜高优栽培氮磷钾肥料合理配施技术进行研究。结果表明，本试验条件下当N223．6、P2O5 50．0和K2O 97．5kg／hm^2，三要素比例为1：0．224：0．436时，蕹菜最高经济产量达31391．4kg／hm^2；当N215．7、P2O5 46．4和K2O9 0．0kg／hm^2，三要素比例为1：0．215：0．417时，蕹菜最佳施肥利润为36211．8元／hm^2，经济产量亦达31360．1kg／hm^2。在同等肥力下，蕹菜硝酸盐含量与施氮水平呈显著正相关；与施磷、钾水平呈极显著负相关。

Effect of N, P and K balanced fertilization on water spinach

The effect functions of NPK application on economical yield,fertilization profit of water spinach(Ipomoca aquatica Forsk) were studied by the field experiments with 3414 best regression design.The results showed that the best NPK application of water spinach with maximum economical yield of 31392.4 kg/hm~2 was N 223.6,P_2O_5 50.0 and K_2O 97.5 kg/hm~2,the best NPK application with the best fertilization profit of 36211.8 yuan/hm~2 and higher economical yield of 31360.1 kg/hm~2 was N 215.7,P_2O_5 46.4 and K_2O 90.0 kg/hm~2.Under equal fertilizer,there was significant positive correlation between different N levels and nitrate content;There was significant negative correlation between different P,K levels and nitrate content.