1. Chinese cabbage heart disease is indeed caused by calcium deficiency, but the use of calcium fertilizer should be different due to different causes of calcium deficiency. 2. For soils that are deficient in calcium, such as red sand, along rivers, etc., about 50-100 kg of lime per acre can receive good results. 3. For the coastal soil, because of its rich calcium, soil calcium is redundant, and lime is not only ineffective, but also brings more salt to the soil, which in turn increases the incidence of major Chinese cabbage heart disease. Therefore, prevention and treatment of coastal Chinese cabbage cabbage heart disease can only use calcium method of foliar. Generally, about 0.5% calcium chloride solution can be sprayed. 4. Due to the small mobility of calcium in plants and the difficulty in transferring, calcium fertilizers can be used in combination with growth regulators. That is, 0.3%-0.7% calcium chloride solution plus 50 mg/kg naphthalene acetic acid solution was sprayed in the early stage of Chinese cabbage cabbage, which can obviously increase calcium application effect.
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