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Abstract
Calcium is an essential element for crops and requires a large amount. The calcium absorbed by plants plays a variety of roles in their bodies, such as promoting the development of cell walls, reducing the extravasation of nutrients in the body, inhibiting the infection of pathogens, and improving the resistance of plants. Disease, eliminate the harm of excessive organic acids in the body, and promote various metabolic processes in the body. Once the crop is deficient in calcium, its metabolism in the body will be blocked, and various symptoms of calcium deficiency will occur. The paper introduces the symptoms of crop calcium deficiency and preventive measures.