For example, the critical value of soil Ca was 920 mg/kg as CaCl_2 was applied to the winter Chinese cabbage in the brown-grey alluvial paddy soil and became 950 mg/kg in the grey alluvial paddy soil.

• 以氯化钙为钙源，渗育灰棕潮田种植耐寒型白菜时土壤缺钙临界值为920 mg/kg，种植萝卜时土壤缺钙临界值为950 mg/kg； 渗育灰潮田种植耐寒型白菜时土壤缺钙临界值为760 mg/kg，种植耐热型白菜时土壤缺钙临界值为700 mg/kg，种植萝卜时土壤缺钙临界值为760 mg/kg。