氮、磷、钾配合施用对油菜硝酸盐含量的影响

Effects of different proportions of N，P，and K on nitrate contents in rape

摘要: 田间和盆栽试验研究不同肥料形态及其配比对油菜体内NO₃^--N 累积的影响结果表明，N 肥是油菜体内N0₃^--N 的主要来源，N、P、K 肥配施显著降低油菜体内NO₃^--N 含量。且N、P、K 肥配施田间与温室栽培表现出较大差异，温室栽培下N、P、K 最佳配施为N225kg／hm²、P₂O₅60kg／hm² 、K₂O₄5kg／hm² ，N：P₂0₅：K₂O 为5：1．33：1，可保证高产和降低油菜体内硝酸盐含量。

Abstract: The field and plot experiments were conducted to study the effect on the accumulation of nitrate in rape by applying different kinds of fertilizers and proportions． The results show that nitrogen fertilizer is the main source of the NO₃^--N in rape．The appropriate combination of N ，P，and K fertilizer can significantly reduce the NO₃^--N content，and there are big differences in the effect on nitrate by applying different N，P，and K proportions in field and greenhouse conditions．The best amounts of N，P，and K applied in greenhouse is N 225kg／hm²，P₂0₅ 60kg／hm²，and K₂O₄5kg／hm²，and the proportion of N：P₂0₅：K₂O is 5：1．33：1．In this way the guaranteed high yield and low nitrate in rape can be obtained．