Dehiscence occurs during the entire development period of pomegranate fruit and it is a problem that pomegranate can not be neglected for its high yield. After the cracking of fruit, the exposed grains provide convenience for birds and animals to feed on them. The formation of wounds is also conducive to the infection of pathogens. In the event of rain, it is prone to disease and fruit rot, resulting in deterioration of the appearance of fruit products, lower commercial value, and causing serious economic losses. I. Characteristics: The severe period of fruit cracking of pomegranate generally starts around one month before fruit harvesting, and the most serious one is 10-15 days before harvest until the harvesting period. Different varieties, cracking occurred significantly different. Thick peel, late fruit ripening fruit light, such as tin, large fruit and other varieties; thin skin, fruit early mature fruit cracking, such as thin skin, falling sweet and other varieties; the outer periphery of the crown compared to the internal ridge, the sun is more than the shade Cracked fruit weight; the fruit has many cracks on the Yang surface, and the mechanical damage is easily cracked. Second, the reason: pomegranate fruit from the skin, placenta diaphragm, seed 3 parts. In the early stages of fruit development, cell division ability is strong, and the extensibility of the pericarp is good. The growth of seeds and pericarp tends to be synchronized and the fruit cracking is not easy to occur. As the fruits are ripe and harvested, and after a long period of high temperature, dryness and sunlight in summer, Directly, resulting in damage to the skin tissue, coupled with the natural aging of the cell tissue, weakening the ability to divide, leading to reduced tissue extensibility. The tissues within the skin, due to less adverse effects from the outside world, still maintain a strong ability to grow, resulting in differences in the growth rate between the inside and outside of the seed and the skin, and in case of unfavorable conditions, it may cause cracking. The external factor that causes cracking is mainly the rapid change of the environmental moisture. In particular, in orchards with persistent drought and lack of irrigation, sudden precipitation or irrigation, roots rapidly absorb water and transmit to the roots, stems, leaves, and fruits of various organs. The growth speed of many seeds is significantly higher than that of the skins that are aging and basically stop growing. When the pericarp capacity reaches the limit, it causes the peel to crack. Cracks caused by this cause are concentrated, heavy, and heavy. Third, prevention 1. Try to keep the soil moisture content of the garden relatively stable. Effective measures should be taken to reduce cracking caused by excessive soil moisture, and techniques such as tree-covered mulching, garden grass-mulching, fertilizing and improving soils can be used to increase soil fertility in dry and thin soil and enhance soil water holding capacity; Technology should not cause loss of cracks due to improper irrigation. 2, timely harvest fruit in batches. Early (sit) fruit early mining, late (sit) fruit late harvest; such as long-term drought when the rain, after the rain after the fruit surface water loss must be harvested. 3, fruit bagging. The bagging of pomegranate fruit can reduce mechanical trauma and direct precipitation, and can effectively reduce cracking, and at the same time, it plays a role in disease prevention and insect control. Can be used to thank the ovary began to expand when the plastic film bag (note that before the bag spray 1 drug). 4. Apply plant growth regulators. Spraying 25 mg/l of GA3 (gibberellin) during the late growth phase can reduce cracking by more than 30%.
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