Effects of Foliar Application of Various Zinc Fertilizers with Organosilicone on Correcting Citrus Zinc Deficiency

文献类型： 外文期刊

第一作者： Peng, Liang-Zhi

作者： Peng, Liang-Zhi

作者机构：

关键词： orange;necrosis;chlorophyll;photosynthesis

期刊名称：HORTSCIENCE （ 影响因子：1.455； 五年影响因子：1.617 ）

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年卷期：

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收录情况： SCI

摘要： To compare the effects of various zinc (Zn) foliar fertilizers on correcting citrus Zn deficiency and to explore an effective correcting method, three common Zn fertilizers, Zn sulfate heptahydrate (ZnSO4 center dot 7H(2)O), Zn chloride (ZnCl2), and Zn nitrate hexahydrate [Zn(NO3)(2)center dot 6H(2)O], were selected to spray the Zn-deficient citrus leaves, tested at different concentrations, with or without organosilicone surfactant. Zn content, chlorophyll levels, and photosynthesis characteristics of leaves were analyzed. Leaf Zn content was significantly increased with increase of the sprayed Zn concentration of the three Zn fertilizers. However, when the sprayed Zn concentration of ZnSO4 center dot 7H(2)O exceeded 200 mg.L-1, and Zn concentration of ZnCl2 or Zn(NO3)(2)center dot 6H(2)O exceeded 100 mg.L-1, obvious necrotic spots formed on leaves. This necrosis disappeared when 0.025% organosilicone was added to the three Zn fertilizer solutions, even at a Zn concentration of 250 mg.L-1. Meanwhile, the Zn contents of leaves increased one to four times for these treatments. Furthermore, foliar application of the three Zn fertilizers significantly improved chlorophyll levels and photosynthetic capacity of Zn-deficient leaves. The data of chlorophyll and photosynthesis characteristics indicate that the correcting effect of ZnCl2 and Zn(NO3)(2)center dot 6H(2)O is better than that of ZnSO4 center dot 7H(2)O, and could be further improved via supplement of organosilicone. In conclusion, ZnCl2 or Zn(NO3)(2).6H(2)O containing 250 mg.L-1 of Zn and supplemented with 0.025% organosilicone is a safe and effective formulation of Zn foliar fertilizer for correcting citrus Zn deficiency.

分类号： S6

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