How to prevent citrus planting cracking citrus cracking and its control measures, citrus cracking phenomenon is very easy to occur before citrus ripening, and the fruit cracking rate can sometimes reach more than 40%, seriously affecting the economic income of farmers. So, what is the cause of citrus cracking? How should citrus crack? This article will give you a detailed introduction to the causes and control measures of citrus cracking: 1. High temperature effects. Soil moisture needs to maintain a certain water content during high temperature and drought, and the rapid change of soil moisture is an important cause of citrus cracking. Many orange farmers have reported that after a week of continuous drought, heavy rains will occur, and many fruit cracks will appear the next day. When the fruit develops and expands and gradually enters the maturity stage, the peel (the grapefruit is a sponge layer) stops growing or thickens, and the sweat cells in the fruit rapidly elongate and increase, which promotes the rapid increase and enrichment of the entire flap, and oppresses the exocarp. Gradually thinning. If this period of maturity continues to be severely dry, after heavy water shortage, it will encounter heavy rain or continuous foot rain. The very hungry sweat will absorb too much water and the sputum will grow too fast. The fruit can not bear such tremendous pressure and will inevitably produce Seriously cracked fruit. 2. Pest and disease hazards. In the young fruit period, if the pests invade the peel, the orange fruit will form a hard skin and a depression, which will cause the fruit to crack in the later stage; some suffer from a lot of damage from the rust tick, not only the peel becomes black, but also the rust wall eats the peel juice and the epidermis is serious. The damage stops growing and growing, leaving only a thin layer of skin. When the fruit grows and absorbs rain, it is most prone to cracking. 3. The citrus tree has poor nutritional status. Fruit trees lacking calcium and potassium deficiency are prone to cracking. Potassium deficiency in citrus can cause thin skin, low total solid content, increased ratio of sugar to acid, and decreased vitamin C, which is prone to cracking. 4. Variety characteristics. Generally, the peel is thin, the texture is soft, and the peel plasticity is small, and cracking is easy to occur. For example, the umbilical orange in the citrus is the thinnest near the umbilicus, and the umbilical part has secondary fruit, which is easy to crack and produce umbilical yellow fruit. The reason is that if the citrus fruit encounters the rainy season in the early stage of growth, the soil in the garden will have a large amount of water, which will cause the fruit to absorb water and then expand rapidly, and make the skin crisp and tender; in the later stage, the precipitation in the late summer and early autumn will suddenly decrease sharply. In addition to the high temperature sunburn, when the double pressure is formed, it is easy to cause a lot of cracking and fruit drop phenomenon. In particular, non-nuclear tangerines, Wenzhou tangerines, navel oranges and other varieties suffer the most. Recently, the citrus in the Three Gorges area of ​​Hubei Province has a large number of cracked fruits, and some fruit cracking rates are about 40%. The losses are serious and the farmers are complaining. What is the reason for a large number of cracks? Citrus experts gave the answer: calcium deficiency, drought, bare land is the main cause. Citrus rips a lot and becomes a worthless rubbish. The citrus cracked fruit, the peasants are miserable. Experts pointed out that the citrus fruit crack is caused by many reasons: this year's citrus yield is high, the fruit is thin, and the recent high temperature and drought, during the rapid expansion of the fruit, the water supply is insufficient, which is the first cause of the increase of cracking fruit; 90% of orchards do not supplement medium-quantity elemental calcium for many years, which is the second reason for the increase of cracking fruit; the orchard uses glyphosate herbicide or artificial weeding all the year round to make the orchard soil bare, and the ability to retain water and fertilizer is reduced, which is the result. The third reason for the increase in cracking fruit. Citrus in the same location in the same environment, managed scientifically without cracking. In the technical training, citrus experts said: citrus cracking must be prevented, grass, calcium supplementation, pre-irrigation crown spray is the key. The key measures are done, and it is completely avoidable. "Citrus cracking fruit, calcium deficiency is the most important reason. Because calcium is an important element of nutrients needed for citrus growth, the physiological function of calcium is related to cell wall tissue. Calcium can stabilize cell membrane and cell wall and enhance cell wall structure and cell adhesion. The function is to connect the cells. When the calcium is deficient, the cell wall disintegrates, the cell wall and the middle rubber layer become soft, the cell rupture appears bitter pox, water heart disease and rot disease, and the calcium deficiency also reduces the hardness of the cell wall, thereby reducing the cell fungal disease. The resistance to dip affects the cracking fruit." Citrus experts teach citrus growers the technology to prevent citrus cracking. “For many years, farmers have only paid attention to the supplement of a large amount of elemental fertilizers such as nitrogen, phosphorus and potassium, but neglected the supplement of trace elements such as calcium and boron. The demand for citrus fertilizer for calcium fertilizer is equivalent to that of nitrogen fertilizer. In the case of drought and rain, it will cause a lot of fruit cracking. In addition to the citrus cracking of the fruit, there will be many problems such as citrus floating skin, fruit drop, black umbilical, granulated, and dry water. 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