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湖北省恩施车坝河水库的部分温州蜜柑树,近年叶片泛黄,连年不能开花结果。经我们于1988年2月前往调查时发现,其叶片的叶肉和叶脉呈完全一致的黄色,比一般缺氮所表现的淡黄色要深,而且新叶泛黄的程度较老叶明显。这与哈斯(Haas,1936)、彭森(Benson,1964)等人所阐述的缺硫规律基本一致,而和贝尔(Bear,1951)等人介绍的一般缺氮时所表现的老叶黄化较新叶早,且黄化程度较新叶深的规律恰好相反。近年对这些病树曾大量施用尿素,但均无任何回青的反应。所以,我们认为上述黄化现象,系因缺硫引起。
Part of Enshi Chebahe Reservoir in Hubei Province, Wenzhou orange tree leaves in recent years, yellowing, perennial can not bear fruit. When we came to the survey in February 1988, we found that the leaf blades had veins and veins that were completely yellow in color and darker than the yellowish color of nitrogen deficiency, and that the extent of new leaf yellowing was greater than that of the older leaves. This is consistent with the lack of sulfur as described by Haas (1936) and Penson (1964), but not with the general lack of nitrogen shown by Bear, 1951 et al. The newer leaves earlier, and the degree of yellowing newer than the law of the opposite. In recent years, these disease trees have been heavily used urea, but no response to any back green. Therefore, we think the above yellowing phenomenon is caused by sulfur deficiency.