燕山山区苹果叶片矿质营养标准范围的确定

在燕山山区,分富士和国光2个品种采集了20个苹果园120份叶样,对叶片中的矿质元素含量进行了分析。结果表明：除Mg外,不同果园苹果叶片中其他营养元素含量差异较大;将2个品种间的各矿质元素含量进行比较发现,同一元素含量平均值差异不大。苹果叶片中N、P、K、Ca、Mg、Fe、Cu和Zn元素含量取值遵从正态分布,采用4点5分段的概率分级法,确定了2个品种叶片营养元素含量标准值中的缺乏、低值、正常值、高值、过高5个数值范围;Mn含量取值近似X2分布,参考高产果园叶片营养分析值对概率分级法进行了矫正。与国内外标准相比,燕山山区矿质元素含量标准值表现出N水平高,P、K、Mg和Zn水平低的特点,Ca、Fe、Mn和Cu含量标准值与国内外其他标准基本一致。

Determination of the Standard Concentrations for Mineral Nutrition in the Leaves of Apple in Yanshan Mountainous Areas

The mineral nutrition in the leaves of apple varieties Fuji and Ralls from 20 orchards were analyzed in Yanshan Mountainous Areas.The results showed that except Mg,other mineral nutrition had large differences among different orchards.The average concentration of the same element had little difference in the two varieties.The concentrations of N,P,K,Ca,Mg,Fe,Cu and Zn were in normal distribution.According to probability grading,the absence,low value,normal value,high value,and excess of standard range of nutritional elements were presented.The concentration of Mn was in X2 distribution.Compared with domestic and international standards,higher N concentration and lower P,K,Mg and Zn concentrations were the significant characteristics,and the standard concentrations of Ca,Fe,Mn and Cu were basically in accordance with other standards.