Insufficient calcium can cause physiological disorders in vegetables, impede plant growth, failure to thrive, 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. If the effective calcium content in the soil is low, the calcium requirement of the vegetables cannot be met; the content of salt in the soil is high, which inhibits the absorption of water and calcium by the root system; the acidity of the soil affects the effectiveness of calcium and is not conducive to the absorption of calcium by the root system. Soil drought, which makes the concentration of soil solution high, reducing the amount of root water absorption, thus inhibiting the absorption of calcium; soil cultivation layer shallow, too sandy, leading to poor water retention and fertilizer, causing loss of calcium; soil too sticky , calcium activity is poor, 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-supplementing measures First, the application of organic fertilizer decomposed calcium. Organic fertilizers are rich in nutrients, which can improve the physical structure and chemical properties of the soil, enhance 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 decomposed organic fertilizer can avoid damage to the root system. Generally, 2000-3000 kg of compost organic fertilizer is applied per mu, and then superphosphate 30-50 kg is added. 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 pellet structure. It will also help reduce disease, increase yield, and improve quality. The application amount of lime is related to the type of soil, acidity and alkalinity, and the types of vegetables. Generally, 40-80 kg of lime per acre is more appropriate; the amount of lime used in sandy soil should be appropriately reduced; when the soil is improved, 105-250 kg should be applied per acre. 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.
main feature
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5. The back-up battery will start work within 0.2 seconds automatically in case the main battery is damaged,ensuring the continuation of surgical operation. There`s failure indication in the handle control panel, to recommend the bulb to be changed after operation.
6. detachable handle jacket ,can be used for high temperature (≤134℃)sterilized.
7. Digital-control circuit offers many functions, with 10 segment brightness selection stepless lighting regulation, brightness memory, low voltage
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11. mould Die-casting Eight edge type Revolving arm.
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