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在盆栽试验中研究了桔苹苹果树体内钙、钾和镁素营养间的相互作用。钙素供应水平低的植株密切地依赖于镁的供应。不供给镁时,叶子过早地和全部地脱落。因而施用镁肥可以显著地增加产量。缺钙时施用钾肥使钙素缺的更多,从而使钾肥效应减小。施钾还降低了叶内钙含量,施镁时则降低的更多。在果实内不存在这种情况,单独施用钾减少了果实内钙含量,镁和钾同时施用则使钙含量略有提高。用1%或2%的硫酸镁喷布三次,进一步证实了喷施镁肥能降低果实中的钙。
The pot experiment was conducted to study the interaction between calcium, potassium and magnesium nutrition in apple tree. Plants with low levels of calcium supply are closely dependent on the supply of magnesium. When magnesium is not supplied, the leaves fall prematurely and completely. Thus the application of magnesium fertilizer can significantly increase the yield. Calcium deficiency when the application of potassium deficiency of calcium deficiency more, so that potash effect reduced. Potassium application also reduced the content of calcium in the leaves and decreased more when magnesium was applied. This is not the case in fruit, where potassium alone decreases the amount of calcium in the fruit, while magnesium and potassium give slightly more calcium at the same time. Spraying three times with 1% or 2% magnesium sulfate further confirmed that application of magnesium fertilizer reduced calcium in the fruit.