Why are the apples in the internal hemorrhoids and skirts susceptible to bitter pit
The cause of high incidence of bitter pitch disease in the inner and lower skirt fruit is that the absorption of calcium needs to be transported to various parts of the earth by transpiration in the form of ions, that is, the absorption of calcium is related to the strength of transpiration. The internal axillary and lower axillae have poor ventilation, less light, and weak transpiration. Therefore, the amount of calcium ions absorbed is small, and calcium deficiency is easily caused, resulting in the occurrence of bitter pit disease. The production of most of the orchards with severe bitter pit disease has the problems of obstruction, structural irrationality, and excessive branch mass resulting in poor ventilation and light transmission. An effective measure to solve the bitter pit disease in the inner and lower skirt is to increase organic fertilizer by applying 2 to 3 kilograms of manure, livestock and poultry excrement per kilogram of fruit and cover grass every year. The second is a reasonable formula fertilization, according to nitrogen, phosphorus, potassium 1:0.7:1.1 ratio of fertilization, to prevent excessive nitrogen. The third is to increase the amount of calcium fertilizer, apply 25-30 kg of calcium nitrate or 150 kg of lime powder per mu. Fourth, the application of fertilizers in the fall will prevent the use of spring fertilizers to compete for calcium fertilizers. The fifth is a steady supply of water to prevent the soil from wet and dry altering the absorption of soluble calcium. Sixth is a new spray inhibitor on Wangshu. The seventh is to improve the ventilation and light conditions, increase transpiration, and promote the absorption of calcium fertilizer in the skirts and pods. The specific measures to improve ventilation and light transmission are to reduce strains, press branches and open windows. The reduced plant is a dense planting garden where the plant spacing is less than 3 meters and 4 meters and the canopy has been handed over. Pressed branches are the ones that go to large branches. After the fruit stage, the number of large branches is gradually reduced to 4-6, especially the large branches below 60 cm above the ground should be removed to facilitate ground ventilation and field operations; on the other hand, “ears†are cut. That is not leaving side branches, lateral branches more than 3 cm in diameter gradually removed, but also cut twigs, pruning after the number of generally 8.1 million per acre, so that large branches are rare and long, the branches are light. Opening the window is to increase the light and ventilation conditions of the lower branch by reducing the number of branchlets on the upper main branch and opening the angle. Through the above measures, the incidence of bitter pit disease in lower skirts and pods can be reduced by 20% to 30%.
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