氮磷钾对早熟桃（千代姬）的影响

目的]研究增施氮磷钾肥对桃树的影响。方法]在正常管理桃园桃树的前提下,选取长势基本一致的12棵桃树分别增施氮、磷、钾肥料,观察桃树的生长情况。结果]氮过量时,桃树徒长枝旺盛;磷过量时,7月下旬桃树生长依然旺盛;钾过量时,7月下旬桃树生长正常。增施氮肥的桃子的耐储藏时间与氮肥增施量成反比;而增施磷钾肥处理增加了桃子的耐储藏性;氮过量的桃子总体上比磷钾过量的桃子更不耐储藏。在正常管理条件下,增施氮、磷、钾肥的桃树的桃产量都有所增加,分别增产11%、66%和17%,增施氮肥的增产效果最明显,增施磷肥的增产效果稍差。增施氮磷钾肥增加了桃子产量,但降低了桃子的糖度。结论]该研究为早熟桃合理施肥提供了理论依据。

Effects of NPK on Precocious Peach Qiandaiji

Objective] The aim was to study the effects of supplementing NPK fertilizers on peach tree. Method] Under the precondition of normally managing peach trees in peach orchard,12 peach trees with basically identical growth potentials were selected for supplementing NPK fertilizers and observing their growth status. Result] When N was excess,the fruitless branches of peach tree grew prosperously; when P was excess,the peach trees still grew prosperously in late Jul; when K was excess,the peach trees grew normally in late Jul. The storage-tolerant time of peaches from trees supplemented with N fertilizer was negatively proportional to supplementation amount of N fertilizer; the treatment of supplementing PK fertilizers increased the storage tolerance of peaches; on the whole,the peaches from trees fertilized with excess N were less tolerant to storage than that from trees fertilized with excess PK. Under the condition of normal management,the peach yields of trees supplemented with NPK fertilizers were increased by 11%,66% and 17% resp.,the yield-increasing effect of supplementing N fertilizer was most obvious and that of supplementing P fertilizer was a little worse. The supplementation of NPK fertilizers increased peach yield,but recued their sugar degree. Conclusion] This study supplied theoretical basis for reasonable fertilization of precocious peach.