水涨龙眼叶片营养元素的适宜含量

Optimum Range of Mineral Element Contents in the leaves of Shuizhang Longan

对水涨龙眼叶片１０个营养元素含量的统计分析表明：采样地点及年份间的差异对叶片元素含量有明显的影响；叶片元素含量的变异系数差异较大，且微量元素含量的变异系数均高于大量元素．初步提出丰产水涨龙眼叶片元素含量的适宜范围：Ｎ１．４×１０－２—１．９×１０－２，Ｐ０．１０×１０－２—０．１８×１０－２，Ｋ０．５×１０－２—０．９×１０－２，Ｃａ０．９×１０－２—２．０×１０－２，Ｍｇ０．１３×１０－２—０．３０×１０－２，Ｃｕ４×１０－６—１０×１０－６，Ｚｎ１０×１０－６—４０×１０－６，Ｍｎ４０×１０－６—２００×１０－６，Ｆｅ３０×１０－６—１００×１０－６，Ｂ１５×１０－６—４０×１０－６．上列标准可供营养诊断之参考．

This paper reports the range of 10 mineral element contents in the leaves of Shuizhang Longan in Tongan,Fujian during 1992-1993.The amount of macro-and micro-elements in the leaves within the same cultivar was definitely affected by different localities and years for sampling.The statistical analysis indicated that the variation coefficients of N contents in the leaves were lower,while those of K,Mg,P and Ca have been increasing successively.The variation coefficients were higher for micro-element contents in the leaves than those for macroelement contents.The present paper recommends that the values of the optimum ranges of the mineral elements in the leaves of autumn shoots of Shuizhang Longan are:N 1.4 ×10-2 1.9×10-2,P 0. 10× 10-2 0. 18×10-2, K 0. 5× 10-2 0. 9× 10-2, Ca 0. 9×10-2 2. 0×10-2,Mg 0.13×10-2 0.30×10-2,Cu 4×10-6 10×10-6, Zn 10×10-6 40×10-6,Mn 40×10-6 200×10-6, Fe 30×10-6 100×10-6, B 15×10-6 40×10-6.These diagnostic criteria may provide the parameters of fertilizer guide.