The soil is rich in calcium, calcium deficiency, and low levels of calcium, not because of calcium deficiency in the soil, but because of absorption and distribution disorders. The absorption of calcium from the soil by fruit trees is mainly absorbed at the root tip. If the soil is poorly managed, the roots are stunted or there is a lack of water in the drought, and the ammonium, potassium, and magnesium in the soil solution are excessive, and there is a conflict with calcium, the calcium absorption may be adversely affected. Calcium absorbed by fruit trees is mainly transported to the above-ground parts with water transpiration, and it is not easy to move to the fruits after entering the branches and leaves. The distribution of calcium between branches and fruits is constrained by the cultivation and management of the plants and the reproductive status of the plants. If partial nitrogenous fertilizer is applied, the branches and leaves grow too prosperous, the competition between the branches and leaves for calcium is intensified, and the accumulation of calcium in the fruits is reduced. The transpiration of the leaves of short-fruit branches is helpful to the absorption of calcium by fruits, and the longer the fruits of the fruit branches are higher in the calcium content. As a result, the branches of the branches will affect the calcium absorption of the fruits. Wangshuxia cut has the effect of reducing fruit calcium disorders. Prevention and treatment of fruit calcium disorders are as follows: 1. First, we must adjust the cultivation and management measures. Increase the application of organic fertilizer, balanced with the fertilizer elements, to prevent partial application of nitrogen fertilizer, to avoid the application of ammonium nitrogen fertilizer. Improve soil management and promote root growth. Fine pruning, proper summer cut, control overgrown leaves grow. 2. Spray calcium during the growth period. The calcium supplement to the fruit depends mainly on spraying. The root-applied calcium fertilizer may enter most of the branches and leaves, but does not achieve the effect of increasing the calcium content of the fruits. It has been reported that the main calcium agents are calcium nitrate, calcium chloride and chelated calcium. The former two are inexpensive and readily available. Mixing with borax is more effective than single calcining. The commonly used spraying concentration is: calcium nitrate 0.4% plus borax 0.1%; calcium chloride 0.3% plus borax 0.1%. The absorption of accumulated calcium in apple and peach fruits is mainly in the young fruit period, and can also be absorbed in the late fruit development period. Generally, it can be sprayed 3-8 times in young fruit period before harvesting. The bagged orchard can be sprayed 2-3 times before bagging and sprayed once after the bag is unwrapped. Calcium supplementation prevents calcium disorders, and at the same time it can improve fruit firmness, storability, intrinsic quality, and extend shelf life. It also enhances fruit disease resistance and reduces fruit rot. Note: Calcium nitrate and calcium chloride can be mixed and sprayed with various fungicides, but cannot be mixed with sulfur-containing pesticides and phosphates (such as potassium Dihydrogen Phosphate) to avoid insoluble precipitates. Both calcium nitrate and calcium chloride are very hygroscopic and must be sealed against moisture after opening and closing.
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