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氮素是影响柑桔营养生长和果实产量最重要的营养元素,而在土壤中又是一种最易缺乏的元素。同时由于氮素在植株中的高度移动性,及果树在不同的生育阶段对氮需要的季节变化,再加之土壤、砧木、树龄、树势等因素的影响,使判断植株缺氮或过量存在一定困难。为此,我们从1977年开始,应用叶分析研究甜橙氮素营养的年周期变化动态,探讨在不同供肥标准下的树体氮素营养状况及与生长和结果的关系,以期为经济有效地施肥提供依据。
Nitrogen is the most important nutrition element affecting the vegetative growth and fruit yield of citrus, and is one of the most deficient elements in the soil. At the same time, due to the high mobility of nitrogen in the plant and the seasonal changes of the nitrogen demand of the fruit tree at different growth stages, together with the influence of soil, rootstock, tree age, tree vigor and other factors, difficult. To this end, we started from 1977, using leaf analysis to study the dynamic changes of nitrogen nutrition in sweet orange, and discussing the relationship between nitrogen nutrition status and growth and fruiting status under different fertilizer standards in order to be economically effective To provide a basis for fertilization.