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作物缺钙,镁或硫,产量即大幅度下降。镁或硫缺乏的临界含量已测定约为0.1％Mg或0.05％S,在某些作物中以干重为准。临界水准使为一定的值,但缺钙的临界含量变异甚大。因而钙营养必须对每一株进行研究。在豆类及草本植物组织中一般较禾谷类及禾本科草类需钙较多,而甘蓝需钙最多。因此,甘蓝钙营养的意义较在禾谷类及草类中要大得多。
Crop calcium deficiency, magnesium or sulfur, the output is substantially reduced. The critical level of magnesium or sulfur deficiency has been determined to be about 0.1% Mg or 0.05% S, in some crops on a dry weight basis. The critical level is a certain value, but the critical content of calcium deficiency varies greatly. Thus calcium nutrition must be studied for each strain. In legumes and herbaceous tissues, the amount of calcium is usually higher than that of cereals and grasses, while cabbage needs the most calcium. Therefore, the meaning of cabbage calcium nutrition than in cereals and grasses is much larger.