槟榔不同叶序Fe、Mn、Cu、Zn的测定与变化规律

对槟榔不同叶序叶片Fe、Mn、Cu、Zn 4种微量元素含量进行测定并对其变化规律进行分析。结果表明:(1)1~7叶序Fe元素含量先增加而后下降,至第5叶达最大水平,Mn元素含量明显增加,Cu元素含量从第3叶开始明显下降,Zn含量各叶序间无明显变化趋势。(2)成龄树体的Fe含量变化范围为122.3~158.5μg/g,Mn为172.2~418.8μg/g,Cu为3.0~4.7μg/g,Zn为39.1~42.0μg/g。(3)第5叶作为营养诊断的采样叶位。

Mensuration and Changeable Rule of Fe, Mn, Cu and Zn Content in Arecanut Leaves with Different Orders

The contents of four microelements Fe,Mn,Cu and Zn in arecanut leaves with different orders were mensurated,and their changeable rule was analyzed.The results showed that:(1) From leaf No.1 to leaf No.7,the Fe content rose first and then decreased,the highest Fe content was found in leaf No.5,the Mn content revealed a significant increasing trend,the Cu content decreased obviously since leaf No.3,and the Zn content had no obvious change.(2) In the mature arecanut plants,the Fe content ranged from 122.3 μg/g to 158.5 μg/g,Mn content did from 172.2 μg/g to 418.8 μg/g,the Cu content was 3.0～4.7 μg/g,and the Zn content was 39.1～42.0 μg/g.(3) Leaf No.5 could be used as the sampling leaf-order for the nutritive diagnosis.