摘要： 叶分析结合缺素症调查和喷施叶肥，初步证明赵县雪花梨树富含钙、镁，缺乏钾、硼、铁和锌，它们的平衡指数分别为149.7、109.5、52.5、26.5、47.6和54.8。喷施叶肥可改善梨树的营养状况。钙和稀土叶肥提高了叶中硝酸还原酶和过氧化物酶活性，并增加了雪花梨果肉的含糖量。建议该地区增施钾肥和微量元素肥料，进一步试验适合当地的叶肥。本工作可供梨树叶分析营养诊断参考。

关键词: 雪花梨, 营养诊断, 叶分析

Abstract: The nutrition of the’Snow flake’pear in Zhao County,Hebei Province,China was studied through the use of the leaf analysis,deficiency symptom investigation and foliar fertilizing.Results show that the’Snow flake’pear has sufficient Ca.Mg,but is deficient in K,B.Fe,Zn.Their balance indexes are 149.7,109.5,52.5,28.5,47.6,54.8 respectively.The use of foliar fertilizer improved the nutrition of’Snow flake’pear.The foliar fertilizer,including calcium,rare earth elements separately raised the activity of the nitrate reductase and superoxidase in the leaf and enhanced the level of saccharide in the fruit.So we suggest that more potassium and micronu trients(B,Zn,Fe)should be applied to this plant in this rig ion around Zhao County and further experiments on the use of approprate foliar fertilizers should be made.This study is a reference in the nutrient diagnosis in the pear.

Key words: Snow flake'pear Nutrient diagnosis, Leaf analysis