期刊论文

中文

经济林研究

1003-8981

1989

2

23-29

本校为第一机构

本文研究了枣树叶片中N、P、K、Ca、Mg、Mn、Cu、Fe、Zn9种营养元素含量的季节变化动态规律。结果表明:全N的含量在初花期以前随着叶龄的增大而迅速降低。在初花期至幼果发育前期较稳定且较低,在幼果发育中期迅速增高,采收后逐渐下降;全P和全K的含量随着叶龄的增加而减小,至叶片成熟后则较稳定;Ca和Mn的含量随着叶龄的增加而迅速增高;Fe的含量在初花期出现低谷,从盛花期到果实发育中期处于稳定的高水平状态,果实进入白熟后逐渐下降,采果后则变动不显著;Mn、Cu和Zn3元素含量的变化趋势与N素水平密切相关;施尿素显著地提高了大多数物候期中叶片全N和Mn的含量,也显著地降低了大多数物侯期中叶片全P...

This paper is mainly concerned with the seasonal dynamics of nine essential elements in the leaves of jujube (Zizyphus jujuba). It also discusses the effects of urea application on the concentrations of these nutritional elements in jujube leaves.The results of this study are summarized as follows, the concentration of total N falls rapidly with the growth of the leaves before anthesis, keeps low and invariable during the period from the bloom to the beginning of the fruit-bearing, increases sharply during the middle period of the fruit-bearing, and gradually declines after harvest; the concen...