钙、硼、钼是十字花料作物需要量大且敏感的三种元素，国内外对该三种元素在土壤中的有效性及临界值指标进行了大量研究。硼和钼的研究取得了较一致的结论，而钙的有效临界指标在不同作物不同土壤气候条件下的差异很大。一般认为，北方石灰性土壤交换态钙和钙饱和度较高而且含 Calcium, boron and molybdenum are three kinds of essential and sensitive elements of cruciferous crops. At home and abroad, the effectiveness of these three elements in soils and the critical value indicators have been studied. Boron and molybdenum research has made more consistent conclusions, and the effective critical value of calcium in different crops under different soil and climatic conditions vary greatly. It is generally accepted that the calcareous and calcium-rich soil in calcareous soils in the north has higher and more saturated levels