What are the causes of fruit cracking in greenhouses
Tomato cracking is a common physiological disease in greenhouses in summer and autumn, and it mostly occurs in fruit color conversion period. According to the site and form of occurrence can be divided into three kinds. The first is a radial crack. This type of cracking fruit is centered on the fruit pedicle and extends toward the shoulder of the fruit. It is radially deep and cracking. It begins from the ripening period of the fruit and produces fine stripe cracks near the fruit pedicle. The cracks are evident 2 to 3 days before the color change. The second is a ring crack. This type of cracking fruit is centered on the fruit pedicle, which is a ring-shaped lobed crack and appears mostly when the fruit matures. The third is a stripe cracker. This type of cracking occurs on the top of the fruit, showing an irregular stripe-like cracking. The reason for the fruit cracking of tomato is mainly in the late development period or during the period of fruit development. Under the adverse environmental conditions such as strong light irradiation, high temperature drought or heavy rain, the skin growth and the pulp tissue expansion rate are not synchronized, the fruit bulge pressure increases, and fruit cracking occurs. Especially in the event of showers or heavy rain, the physiological function of plant roots appears, affecting the absorption and operation of water and nutrients, and easily producing cracks. The plants are topped and the fruit is suddenly watered after exposure to strong sunlight. It is also prone to cracking. Tomato cracking fruit is also related to the variety. The thin variety of the peel is easy to crack the fruit, and the thick variety of the peel is not easy to crack. The lack of trace elements such as calcium and boron can cause cracks in the tomato fruit surface. To prevent the cracking of tomatoes, the first choice should be a strong anti-cracking variety. Production of the application of Chinese vegetable No. 6, Maofen 802, red agate 140, red hybrid 16 and other varieties of crack resistance, can be selected according to local conditions. Second, we must strengthen field management. Moisten the water in a timely and appropriate manner to avoid over-drying or over-wetting of the soil, or to dry out. After the rain, the trenches will be drained and dampened in time. Increase organic fertilizers and good quality bio-fertilizers to improve soil structure and provide good environmental conditions for root growth. Frequent spraying of calcium, boron and other trace element fertilizers. The pruning should be moderate, keep the plants with lush foliage, enhance the transpiration of excess water in the plants, and avoid the concentrated supply of nutrients to cause fruit cracking. The correct use of plant growth regulators, the concentration of hormone spray can not be too large, to determine the concentration of the use of a reasonable concentration and temperature. Spraying calcium chloride, zinc sulfate and other foliar fertilizers at the appropriate time during the fruit enlargement period will help improve the nutritional status of the plant and enhance the anti-cracking ability of the fruit. Spraying 100 times of 27% high-fat film emulsion also has a certain effect on reducing cracking.
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