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对‘苹果梨’幼树、盛果期树及老树叶片营养元素含量迸行了测定，在年周期内各 树龄树叶片营养元素含量呈现基本一致的规律性变他7月下旬至8月上旬可作为苹果梨叶分 析的适宜采叶时期。通过对26个供试苹果梨园的叶分析，明确了叶片各营养元素间存在极其 复杂的相互作用，叶片各元素含量的变异系数差异较大，且微量元素含量的变异系数多显著高 于大量元素。初步明确延边地区苹果梨树普遍缺乏钾、氮、锌，需肥顺序是钾＞氮＞锌＞铁 ＞钙。
The content of nutrient elements in ’apple pear’ saplings, full-fruit trees and old leaves were measured. The nutrient content of leaves of all ages showed the same regularity in the annual cycle. From late July to early August Apple leaf can be used as a suitable leaf harvesting period. Through the leaf analysis of 26 apple orchards, we found that there are extremely complex interactions among the nutrient elements in the leaves. The coefficients of variation of the elements in the leaves are quite different, and the coefficients of variation of the contents of the trace elements are significantly higher than those of the macronutrients . Preliminary clear Yanbian Apple pear trees generally lack of potassium, nitrogen and zinc, fertilizer order is potassium> nitrogen> zinc> iron> calcium.