Calcium is an indispensable element in the growth and development of vegetables. Insufficient calcium can cause physiological disorders in vegetables, impede plant growth, fruit failure, or cause other physiological diseases. In recent years, calcium deficiency in protected areas has become more serious. Symptoms of calcium deficiency are generally young leaves and young tissues, and fruit is very susceptible to calcium deficiency. The symptoms are as follows: the newly emerged parts of the plant, such as the apical buds and root hairs, have stagnant growth and atrophy; the new leaves adhere to one another and cannot be normally expanded; the new leaves are often coke-edged and incomplete; the plants are short and soft, and the internodes are short; There is a depression, dark brown necrosis; growth point necrosis when severe calcium deficiency.
The cause of calcium deficiency is soil. For example, if the available calcium content in soil is low, it can't meet the demand of calcium-sensitive vegetables; the content of salt in soil is high, which inhibits the absorption of water and calcium by the root system; the soil is acidic, which affects the effectiveness of calcium and is not conducive to the root system of calcium. Absorption; soil drought, making the concentration of soil solution high, reducing the amount of water absorption in the roots, thereby inhibiting the absorption of calcium; soil cultivation layer shallow, too sandy, leading to poor water retention and fertility, causing loss of calcium; soil over Sticky, poor calcium activity is not conducive to root absorption. The second is partial nitrogen fertilizer. Because of the interaction between nitrogen and calcium, excessive application of nitrogen fertilizer will reduce the availability of calcium in the soil and affect the absorption of calcium by vegetables, resulting in calcium deficiency. In addition, the imbalance in water supply and root injury can also cause calcium deficiency in vegetables.
Calcium supplements First, the application of decomposed organic fertilizer, base fertilizer calcium. Organic fertilizers are rich in nutrients, which can improve the physical structure and chemical properties of the soil, increase the ability of the soil to retain water and fertility, reduce drought damage, and promote the absorption of calcium and other nutrients by vegetables. At the same time, the application of organic fertilizer can avoid damage to the root system. The second is the rational use of lime to improve soil cultivation. Lime is a commonly used calcium fertilizer. Applying lime in acidic soils will help increase soil pH and improve soil structure. It will also help reduce disease, increase yield, and improve quality. The third is deep plowing and the use of plastic film cover cultivation. Deep plowing can fully ripen the soil. Improve the physical structure and chemical properties of the soil, and enhance its ability to retain water and fertility: The use of mulching film can maintain the relative stability of soil moisture and reduce the loss of calcium.
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