In order to regulate the contradiction between growth and results, the citrus fruit usually occurs twice in the growing period of physiological fruit drop, the first time in about the beginning of May. The second time around the end of May to early June, this physiological fruit drop is also called "June fruit drop." In comparison, the "June fruit drop" has a greater impact on the yield of citrus fruits. An excessive number of fruit drop results in a decrease in the number of individual plants and a reduction in yield. Since the reasons for this fruit drop are affected by factors such as climate, tree vigor, nutrition, and land conditions, it is not enough to rely solely on flowering and fruit protection measures before and after the flowering period, but comprehensive prevention measures should be taken early to avoid a second fruit drop. Too much to ensure year after year harvest. The specific approach is as follows:
First, the winter cold leaf: winter leaves more, the old leaves less orange trees than the winter, less fallen leaves, orange leaves more than the old trees fall and fall is serious, in case of abnormal weather will be a more significant reduction in production. Therefore, it is one of the key measures to solve the problem of falling fruit in the winter to do cold and leaf protection work. First of all, fertilize fertilizer in the first half of the year before fruit harvesting, that is, winter fertilizer and autumn manure, mainly organic fertilizer, and 30% of the annual fertilization amount in conjunction with other delayed fertilizers. After the fruit is harvested, the roots will be cultivated in mid-December. -30 cm high to increase soil temperature and prevent freeze-dried leaves. However, in the spring when temperatures begin to rise in the coming year, the soil will be opened in time to facilitate the normal physiological activities of the orange trees.
Second, to cultivate a robust tree vigor: the adjustment of tree nutrients is one of the main measures to cultivate robust tree vigor. Nitrogen, phosphorus, and potassium (re)fertilizers are applied from mid-July to early August, accounting for 50-50 of the annual fertilization amount. 60%, in order to achieve the purpose of improving the nutrition of the tree, promoting the thickness of the autumn shoots and fruit enlargement, which is also beneficial to the flower bud differentiation from September to October, and is directly related to the issue of flowering quantity and flower quality in the second year.
Third, early sparse buds, reasonable control tip: sparse buds are generally carried out in the spring, while the control tip is mainly summer. If the spring is over-controlled, it will cause rapid growth of the summer shoots and aggravate the second physiological decline. During the flower buds period, the trees that have more deciduous leaves in the first year of winter should be eliminated as early as possible. For trees with good tree vigor, attention should be paid to the results of the branches and branches, and only the buds of the dense leaves must be removed. Strong, the result of the tree in addition to all erased the bud at the dense place, but also to sparse spring too much hair, about 1/3-2/5.
Fourth, the correct use of pesticides to protect fruit: the appropriate use of chemical agents can prevent the occurrence of stratification, stable fruit and strong fruit, but the abuse of pharmaceutical agents will cause quality decline, affecting the consequences of the tree, thus affecting production. If you can use the "900" sprayer leaf with 50ppm concentration during physiological fruiting fall twice, you can increase the fruit set rate by about 20%, if the preserve fruit agent is 0.2% boron, 0.2% potassium dihydrogen phosphate, 0.5% When urea is used immediately after being mixed with 1000 times of carbendazim, it can protect fruits and prevent pests.
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