钙柑桔吸钙量通常高于吸氮量,被吸收的钙主要蓄积在叶片、细根及枝干、特别是老的组织部位中。缺钙时,除叶片边缘及叶脉间部位开始变黄外,往往果实尚未成熟就脱落,小枝节部肿大,进而逐渐枯萎,但是柑桔园中一般很难见到缺钙的直接为害,往往是因钙不足所导致的间接为害,如土壤理化性质恶化,强酸反应所造成的土壤养分流失、养分的固定以及诱发某些金属无素的过剩为害等。在日本这样雨水多,施肥量高,且多数果园呈倾斜状的情况下, Calcium citrus calcium intake is usually higher than the amount of nitrogen absorption, the absorption of calcium mainly in the leaves, fine roots and branches, especially in the old tissue parts. Calcium deficiency, in addition to leaf edges and veins began to turn yellow outside the parts, often fruit is not mature off, the enlargement of branchlets, and then gradually withered, but the citrus garden is generally difficult to see the direct impact of calcium deficiency, often Is due to the lack of calcium caused by indirect damage, such as deteriorating soil physical and chemical properties, acid loss caused by the reaction of nutrients in the soil, nutrient fixation and induced some of the excess of harmful elements of the metal. In Japan, where there is a lot of rain and fertilizer is high, and most orchards are inclined,