赣南纽荷尔脐橙叶片黄化与营养元素丰缺的相关性

【目的】研究赣南产区纽荷尔脐橙叶片的营养元素含量,探讨产区纽荷尔脐橙叶片黄化的原因。【方法】2008年对赣南9个县(市、区)78个果园叶片的矿质营养元素进行分析。【结果】脐橙叶片P、S、Mo、B含量均处于适宜范围,而N、K含量均高于适宜范围,Fe含量也处于适宜范围或以上,且仅个别果园的叶片Mn含量低于适宜范围;部分果园的叶片Ca、Cu含量低于适宜范围;黄化果园的叶片Mg含量均存在显著缺失,且随着黄化程度的增大,叶片Mg含量呈显著下降趋势(P0.05);此外,不仅黄化果园存在Zn缺乏问题,而且正常果园的Zn含量也显著低于适宜范围。【结论】赣南产区黄化果园叶片无N、P、K、S、Fe、Mo、B的缺失,叶片普遍存在的黄化现象也绝非缺Ca、Mn和Cu所致,而主要与Mg、Zn有关。

Relationship Between Leaf Yellowing Degree and Nutrimental Elements Levels in Navel Orange(Citrus sinensis Osbeck)Leaves in Southern Jiangxi Province of China

【Objective】 In order to explore the reasons for leaves yellowing of navel orange in southern Jiangxi province, nutrimental elements contents of Newhall navel orange leaves were studied. 【Methods】 Nutrimental elements of Newhall navel orange (Citrus sinensis Osbeck) trees’ leaves on trifoliate orange [Poncirus trifoliata (L.)] rootstocks in 78 orchards in southern Jiangxi province of China were analyzed in 2008. 【Result】 P, S, Mo and B contents of these leaves were in the optimum range, while N, K levels were higher than the optimum range. Fe content also was in the optimum range or above. Except for individual orchards, Mn content of leaves was in the desirable scope. Ca and Cu contents of leaves in part of the orchards were lower than optimum range. Furthermore, there was significantly lack for Mg content of leaves in the yellow orchards. With the increasing of leaves yellowing degree, Mg content of leaves was significantly declined (P＜0.05). In addition, Zn content of leaves wasn’t only deficient in the yellow orchards, but also Zn content of leaves in normal orchards was significantly lower than the optimum range.【Conclusion】 N, P, K, S, Fe, Mo and B contents of leaves weren’t deficient in yellow orchards of southern Jiangxi province of China. And leaf yellowing phenomenon generally weren’t due to the deficiencies of Ca, Mn and Cu, mainly concerned with the deficiencies of Mg and Zn. Key words: southern Jiangxi province; navel orange; nutrimental elements; leaves yellowing