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对核桃叶片中N,P,K,Ca,Mg等4种元素含量的动态变化规律及元素间的分配比例进行了研究。结果表明,核桃叶片中各元素含量的变化规律与树体自身的生长规律相吻合,在整个生育期中,N,P和K等3种元素以树体萌芽期的叶片含量最高,而Ca与Mg以9月份的叶片含量高。叶片中P与Mg,K与Ca含量变化表现出明显的负相关关系。整个生育期,早实、晚实核桃叶片各元素含量中,N,P和K所占比值呈逐渐下降趋势,而Ca与Mg所占比值则呈逐渐上升趋势。叶片中N含量所占比例一直最高,K和Ca含量所占比例次之,P与Mg含量所占比例最低。
The dynamic changes of N, P, K, Ca, Mg and other elements in walnut leaves and their distribution ratio were studied. The results showed that the variation of the content of each element in walnut leaf was consistent with the growth rule of the tree itself. During the whole growing period, the content of N, P, In September the leaf content is high. Leaf P and Mg, K and Ca content showed a significant negative correlation. In the whole growth period, the proportion of N, P and K in early fruiting and late-fruiting walnut leaves showed a gradual downward trend, while the ratio of Ca and Mg increased gradually. The content of N in leaves has the highest proportion, the proportion of K and Ca is the second, and the content of P and Mg is the lowest.