果树资源学报2026，Vol.7Issue(5)：45-50,6.
滴灌供钾浓度对苹果氮素吸收利用及产量品质的影响
Effects of Potassium Level on Nitrogen Uptake and Utilization,Yield and Quality of Apple under Drip Irrigation
摘要
Abstract
[Objective]Improve the technical parameters of apple fertigation,and define the potassium supply concentra-tion for drip irrigation targeting the improvement of yield,fruit quality and nitrogen-use efficiency.[Methods]A field experi-ment was conducted using eight-year-old'Nagafu No.2'/SH/Malus hupehensis apple trees,with six K2 SO4 concentrations(0,0.2,0.4,0.6,0.8,and 1.0 g·L-1,designated as CK,T1,T2,T3,T4,and T5,respectively)applied via drip irriga-tion.The 15 N isotope tracer technique was employed to investigate the effects of different K2 SO4 concentrations under drip irri-gation on apple yield,fruit quality,nitrogen utilization and distribution characteristics.[Results]The T2 treatment signifi-cantly increased leaf area,chlorophyll content,and leaf N concentration.With increasing K supply,N accumulation in all plant organs(except the central trunk)and in the whole tree first increased and then decreased,peaking at T2.The 15 N utilization rate followed the same trend as whole-tree N accumulation.Under CK,15 N allocation ranked as vegetative organs>storage organs>reproductive organs.As K concentration increased,15 N allocation to reproductive organs first rose and then fell,reac-hing the maximum at T2 and T3.The T2 treatment also produced the highest values for single fruit weight,yield per tree,sol-uble solids,soluble sugars,and sugar-acid ratio,all significantly surpassing those of other treatments.[Conclusion]A drip-applied K concentration of 0.4 g·L-1 effectively promotes leaf growth,enhances N absorption and utilization,and improves both yield and fruit quality in apple trees.关键词
滴灌/钾浓度/氮素利用/产量/品质Key words
drip irrigation/potassium concentration/nitrogen utilization/yield/quality分类
农业科技引用本文复制引用
田歌,杨凯,李广晋,续海红..滴灌供钾浓度对苹果氮素吸收利用及产量品质的影响[J].果树资源学报,2026,7(5):45-50,6.基金项目
山西省基础研究计划项目自由探索类(202403021212307) （202403021212307）
山西农业大学博士科研启动项目(2024BQ01) （2024BQ01）
山西省博士毕业生、博士后研究人员来晋工作奖励经费科研项目(SXBUKY2024062) （SXBUKY2024062）
果树种质创制和利用山西省重点实验室开放基金(PILAB20241501) （PILAB20241501）
