为了探求滴灌条件下不同磷钾肥配比对苹果品质的影响和寻求优质苹果适宜的磷钾肥施肥方案，通过田间试验，对不同磷钾肥配比苹果品质指标进行测定分析。试验共设置5个滴灌处理：低磷中钾（P1K2）、中磷中钾(P2K2)、高磷中钾(P3K2)、中磷低钾(P2K1)、中磷高钾(P2K3)，以及地面灌溉对照组CK：中磷中钾(P2K2)。结果表明：各处理中，P2K3处理苹果的单果重及可溶性固形物含量值最大，酸度值最小；P2K2处理苹果的果形指数及果肉硬度值最大；滴灌施肥比传统的地面灌溉更有利于苹果树果实的生长发育，可明显提高苹果单果重、果形指数、果肉硬度、可溶性固形物、酸度等品质指标；对各处理的品质指标进行主成分分析，综合考虑施肥量以及经济效益分析认为滴灌条件下，P2K2处理（P2：70 kg/hm2、K2：100 kg/hm2）的磷钾肥配比最有利于提高苹果树的果实品质。

In order to explore the effect of different ratios of phosphorus and potassium fertilizers on apple quality under drip irrigation conditions and the suitable phosphorus and potassium fertilizer application schemes for high quality apples, the quality index of apples with different phosphorus and potassium ratios was determined by field experiment. A total of 5 drip irrigation treatments were set up in the experiment, including low phosphorus medium potassium (P1K2), medium phosphorus medium potassium (P2K2), high phosphorus medium potassium (P3K2), medium phosphorus low potassium (P2K1), medium phosphorus high potassium (P2K3), and ground Irrigation control group CK: medium phosphorus and potassium (P2K2). The results showed that in each treatment, the single fruit weight and soluble solids content of P2K3 treated apples were the largest and the acidity value was the smallest; the fruit shape index and pulp hardness value of P2K2 treated apples were the largest; drip fertigation was more favorable to apple trees than traditional ground irrigation; Fruit growth and development could significantly improve apple fruit weight, fruit shape index, pulp hardness, soluble solids, acidity and other quality indicators. The principal component analysis of quality indicators of each treatment with comprehensive consideration of fertilization amount and economic benefit indicated that under drip irrigation conditions, the ratio of phosphorus to potassium fertilizer of the P2K2 treatment (P2: 70 kg/hm2, K2: 100 kg/hm2) was the most beneficial to improve the fruit quality of apple trees.