通过对核桃叶片常量元素含量年周期变化的研究,初步探明叶片各营养元素含量季节性变化规律是:氮、磷、钾含量随着时间的推移显示出下降的趋势;钙和镁呈增加的趋势;氮、磷、钾含量以5月最高;7、8月各营养元素种间比较均无明显差异。并通过计算得出核桃树体总营养状况和生理平衡指数。 Through the study of the annual variation of the elemental content of the leaves of walnut, we found that the content of nitrogen, phosphorus and potassium showed a declining trend with the passage of time; the content of calcium and magnesium increased Trend; the contents of nitrogen, phosphorus and potassium were the highest in May; there was no significant difference between July and August in all kinds of nutrient elements. And by calculating the walnut tree total nutritional status and physiological balance index.