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为探讨沙田柚叶片营养元素含量指标,作者于1989—1991年进行了本研究。结果表明,沙田柚叶片大量元素含量的变异系数以氮最小,钙最大,钾、镁和磷依次减小;微量元素含量的变异系数除硼外,其余都明显大于大量元素,其中锰最大,铁、锌和铜相近,且明显小于锰,硼最小。本研究提出了丰产沙田柚叶片营养元素的适宜含量:氮2.3～2.8％,磷0.1—0.14％,钾1.0—2.0％,钙2.5—5.8％,镁0.2—0.38％,铁33×10~(-6)—140×10~(-6),锰10×10~(-6)—70×10~(-6),锌15×10~(-6)—35×10(-6),铜4×10~(-6)—25×10~(-6),硼39×10~(-6)—76×10~(-6)。大量元素的适宜比值为:氮:磷:钾:钙:镁=1.00:0.05:0.59:1.04:0.11;微量元素的适宜比值为:铜:锌:锰:硼:铁=1.00:1.72:2.76:4.48:5.97。以上标准可作为衡量沙田柚叶片营养元素含量盈缺及平衡与否的重要参数。
In order to explore the nutrient content of leaves in Shatian pomelo, the author conducted the study in 1989-1991. The results showed that the coefficients of variation of the major elements in leaves of Shatida pummelo were the lowest in nitrogen, the highest in calcium, and the lowest in potassium, magnesium and phosphorus. The coefficients of variation of trace elements were significantly greater than those of boron except for boron. Among them, , Zinc and copper are similar, and significantly less than manganese, boron minimum. In this study, the appropriate content of nutrient elements in leaves of pomelo of Shatianyong was raised: 2.3-2.8% of nitrogen, 0.1-0.14% of phosphorus, 1.0-2.0% of potassium, 2.5-5.8% of calcium, 0.2-0.38% of magnesium and 33.0-10% of iron -6) -140 × 10 -6, manganese 10 × 10 -6 -670 × 10 -6, zinc 15 × 10 -6 -635 × 10 -6, Copper 4 × 10 -6 -625 × 10 -6 and boron 39 × 10 -6 -676 × 10 -6. The suitable ratios of trace elements were: N: P: K: Ca: Mg = 1.00: 0.05: 0.59: 1.04: 0.11; 4.48: 5.97. The above criteria can be used as a measure of Shatianyu pomelo leaf nutrient content and lack of balance and the important parameters of the balance.