琯溪蜜柚叶片营养元素适宜含量的研究

Optimum Range of Mineral Element Contents in the Leaves of Guanxi Honey Pomelo (Citrus grandis)

本研究探讨我国名柚琯溪蜜柚的叶片元素含量适宜范围.生物统计表明:同一县域内不同地点、年份的叶片元素含量存在明显差异.其叶片大量元素含量的变异系数呈现为,氮、磷较小,镁、钾其次,钙最高;叶片微量元素含量的变异系数多高于大量元素,其中硼、锰更高.文中初步提出丰产琯溪蜜柚叶片元素的适宜含量:氮2.50—3.10%,磷0.14—0.18%.钾1.40—2.20%,钙2.00—3.80%,镁0.32—0.47%,铜8.0—17.0ppm,锌24.0—44.0ppm,锰15.0—140.0ppm,铁60.0—140.0ppm,硼15.0—50.0ppm.上列标准可供琯溪蜜柚营养诊断指导施肥之参考.

The optimum ranges of macro-and micro-clement contents in the leaves of Guanxi Honey Pomelo in south Fujian of China were studied in 1988-1989. The main results are as follows. The amount of macro-and micro-elements in the leaves within the same cultivar was affected by different locations and years of sampling. Furthermore, data from the statistical analysis indicated that the variation coeffecients of N and P contents in the leaves were lower, while that of Mg, K and Ca have been increasing successively. The variation coefficients were higher for most micro-element contents (especially B and Mn)in the leaves than that for macro-element contents. The present study recommends that the values of the optimum ranges of the mineral elements in the leaves of spring shoots of Guanxi Honey Pomelo are N 2. 50 -3. 10% , P 0. 14-0. 18%, K 1. 40-2. 20%, Ca 2. 00-3. 8%, Mg 0. 32-0. 47%, Cu 8. 0-17. 0ppm, Zn 24. 0 - 44.0ppm, Mn 15. 0-140. Oppm, Fe 60. 0-140.0ppm, B 15. 0-50.0ppm. These diagnostic criteria may provide the parameters of fertilizer guide.