Calcium is one of the essential elements in plant growth. It can enhance the drought resistance of plants, neutralize acid substances and detoxify, and can reduce the toxic effects of excessive potassium, sodium, magnesium, and iron ions in plants. At the same time, calcium is also a kind of element that is relatively easy to lack in soil. For fruit trees, calcium deficiency is more common. Severe calcium deficiency, the root growth was significantly inhibited, growth point rot, the fruit appears chicken paw disease, bitter pit disease, spot disease, water heart disease, black heart disease, cracking fruit, thrombosis and so on. First, the main reasons affecting the absorption of calcium in fruit trees 1. Soil. Soil properties, pH, and water content all affect calcium absorption. Generally acidic soils and sandy soils are prone to calcium deficiency. Excessive or too small soil moisture content can cause calcium deficiency in fruit trees. 2. Tree potential and load. The tree grows too vigorously, and the branches and fruits compete for calcium, and the fruits are prone to calcium deficiency symptoms. Excessive pruning will lead to prosperous branches, which compete with the fruit for calcium, exacerbating the occurrence of calcium deficiency symptoms. 3. Other fertilizer antagonistic. Nitrogen, potassium, sodium, magnesium and other elements will inhibit the absorption of calcium, so fertilization should be balanced, can not be biased. Boron promotes the absorption of calcium by crops. It can also increase the fruit setting rate and reduce the production of fruit. It can be applied in due course. 4. Climate factors. The transport of calcium in fruit trees is mainly due to the effect of transpiration. All factors that affect transpiration, such as light, air humidity, and atmospheric temperature, can affect the absorption and transport of calcium. The higher the humidity, the less the light, and the less the transpiration, the lower the amount of calcium absorption in the fruit trees. Second, why bagging fruit easy to calcium deficiency 1. There is no secondary distribution of calcium, and the calcium allocated to the fruit is rarely present. Studies have shown that in the organs of fruit trees, the calcium distributed in the fruits is the least, which is far less than that distributed in shoots, young leaves, and flowers. 2. Bagging weakened the transpiration of young fruit, further reducing the distribution of calcium into the fruit. 3. The earlier the bagging, the weaker the transpiration of young fruit, the less calcium supplementation, the more severe the symptoms of calcium deficiency. Third, bagging fruit trees calcium measures 1. Increase organic fertilizer and balance fertilization. The basic method for calcium supplementation in fruit trees is to increase organic fertilizer, increase soil organic matter content and improve soil physical and chemical properties. In the autumn basal fertilization, 30-40 kg of calcium magnesium phosphate fertilizer and superphosphate are applied per acre, and in the early spring, the addition of available calcium is appropriate. In addition, we must pay attention to balanced fertilization, especially after bagging should control the amount of nitrogen fertilizer. 2. Reasonable load, timely bagging, try not to ring. Trim properly to remove twigs, drooping branches, etc. from the crown and create a good condition for ventilation and light transmission. 3. Soil topdressing calcium fertilizer. In the spring and autumn, basic fertilizer and top dressing are applied in time to increase the accumulation of calcium in the tree body. After autumn, if the base fertilizer is not applied with calcium fertilizer, it may be combined with top dressing 1-2 times of available calcium (such as calcium ammonium nitrate, calcium nitrate, etc.) in the spring. 4. Leaf calcium. Due to the particularity of calcium in the operation of plants, calcium supplementation in fruit trees should be applied in both the soil and spray. The flowering of fruit trees is usually the peak of calcium absorption of fruits from 4 to 6 weeks after flowering. Continuous spraying of calcium fertilizers for three times during the period can significantly increase the absorption of calcium in pre-fruit. For late-maturing fruit trees, about 30 days before harvesting (after bagging the fruit), spray 1-2 calcium fertilizers again, which can improve the quality of the fruit and increase its storage stability. Foliar spraying should be properly adjusted according to the weather conditions to avoid the occurrence of fertilizer damage. In addition, tree injury can also affect calcium absorption, and calcium deficiency can occur even more. Therefore, it is not recommended to supplement fruit trees with infusion methods, and calcium-deficient orchards also try not to adopt girdling measures. Finally, to remind fruit farmers friends, the current market, the variety of calcium fertilizer disorder, advertising and false propaganda, pay attention to when selecting: First, to use the products of the regular manufacturers; Second, select the products registered in the relevant departments, Do not use it at will. Third, if you want to choose high-water solubility as top dressing or foliar spray, take a small amount of sample and put it in water to test its solubility. Recommended use of calcium ammonium nitrate, fruit and vegetable calcium fertilizer, calcium bio-chelation, calcium nitrate, etc., specific dosage and use methods can refer to product specifications. 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