不同龄期及不同长势核桃的养分特征

Study on the Nutrition Feature in Juglans regia

通过对核桃苗期、幼龄期、始果期的植株叶片和果实营养元素N、P、K和微量元素Fe、Zn含量的分析测试,结果表明,核桃1年生苗木叶片中N、P、K、Zn含量高于幼龄期和始果期植株;核桃各龄期在年生长过程中,叶片中的N、P、K、Fe、Zn养分含量总体呈下降趋势,但N素含量在第2次生长期7月较年生长初期低,比其它生长时期高,在年生长中N、P、K养分含量的比例存在差异,N、K素营养相对含量经历“低-高-低”的过程,N素营养相对含量表现尤其明显;核桃幼龄期、始果期植株长势的差异主要体现在同一时间叶片及果实中N含量的差异。

The contents of N, P, K, Fe and Zn in leaf and nut of Juglans regia in different age stages were measured and analyzed. The results shows that the contents of N, P, K and Zn in leaf of one-year-old seedling are higher than that in leaf of juvenile and first-fruiting plant ; the contents of N, P, K, Fe and Zn in leaf are decreased in generally during annual growing process, hut that of N in July is higher than other growth time except for April ; the ratio of N, P and K in leaf varied with time in seedling, juvenile and first-fruiting plant during annual growing process, relative contents of nutrient N and K are in the course of low-high-low, especially N nutrition ; the content of N nutrition in leaf or nut were greatly different in juvenile and first-fruiting plants with normal and poor growth vigor.