What is the physiological fruit drop of persimmon?

What is the physiological fruit drop of persimmon? Please introduce the causes and methods of prevention and control of physiological fruit drop of persimmon as follows: first, the factors of physiological fruit drop of persimmon. Due to improper management, persimmon will drop a lot of fruit one month after flowering, and the peak period of fruit drop is about 20 days after flowering, and then there is a small amount of fruit drop in August. The reasons for persimmon fruit drop are more complex, there are probably the following factors: 1. Malnutrition, nutrient imbalance, new shoots continue to grow during fruit drop, nutrients are consumed by new shoot growth. two。 Lack of light, shade or too much rain reduce assimilation, so that some of the fruits in the nutritionally disadvantageous parts can not get enough nutrients and fall off. 3. Insufficient moisture, excessive dryness, affecting the normal physiological function and leading to fruit drop. 4. The ovary atrophied due to poor pollination. Second, the countermeasures to prevent the physiological fruit drop of persimmon. 1. Strengthen the management of fertilization, maintain the healthy growth of trees, enhance the assimilation ability of leaves, so as to regulate the distribution of nutrients within branches and ease the contradiction between growth and fruit. two。 Ensure that there are sufficient light conditions, timely elimination of stagnant water in the rainy season, timely irrigation in the dry season, maintain the vigorous growth of the tree, and the fruit develops well. 3. Appropriate mixed pollination varieties, more bees, so that pollination and fertilization can be carried out smoothly. 4. Artificial pollination can effectively prevent physiological fruit drop. Most of the excellent varieties of persimmon only have female flowers, although they are mixed with male flowers, they are only a few after all. In order to ensure good fruit and less fruit drop of persimmon, artificial pollination is a link that can not be ignored. However, due to the different regional climate, persimmon flowers bloom successively, artificial pollination should also be divided into 3 or 4 times, pollination can be reliable. 5. Circular peeling of young trees with exuberant growth can promote flower bud differentiation and fruit earlier. On the other hand, the adult trees which have reached the age of full fruit can reduce the physiological fruit drop and advance the fruit ripening period. The suitable period of ring peeling is generally carried out at half of the flowering time of persimmon trees, and if the peeling range is too late or too large, the wound is difficult to heal, which will lead to the weakness of the tree, or even the death of the whole branch or the whole plant, and the peeling width is limited to 1.5 cm. Peeling can be achieved in the same year, but it must be carefully used because of the tree, which can be applied in the trunk and the base of the main branch, as well as in the base of the fruiting branch or in the fruiting mother branch, but it is not suitable to be carried out every year, otherwise it is easy to weaken the tree potential and shorten the life span. 6. Spraying gibberellin with 50PPM in young fruit stage or using 0.5% urea as extra-root topdressing also had a good effect on reducing fruit drop. Click to get more persimmon planting techniques click to get more fruit planting techniques