The amount of citrus flowers is large and the fruiting rate is low, which is one of the main reasons for the low yield per unit area of ​​citrus in China. Most oranges have a fruiting rate of 2%, and high ones can only reach about 7%. Most flowers cannot be fruitful. Therefore, it is particularly important to do a good job in maintaining flowers and fruits. To sum up, the main measures of preserving flowers and fruits are as follows:
1. Strengthen the management of fertilizer and water, and timely and rational fertilization and orchard drainage and irrigation work according to the requirements of fertilizer and water management. More citrus trees with more leaves, should be applied in small amounts. For trees with less flowering, it is necessary to strictly control the amount of nitrogen fertilizer before the shoot. In citrus gardens where the roots of the drought are damaged, attention should be paid to foliar fertilization. Flowering period, new shoot growth period, spraying foliar fertilizer several times to improve the quality of flowers. In order to alleviate the contradiction between the tip and the bud, the tip and the fruit, the foliar fertilizer should be sprayed several times before the second physiological drop. The flower is sprayed 2 or 3 times before the flower, and sprayed 1 or 2 times after the flower. The types of foliar fertilizers are: 0.2-0.3% potassium dihydrogen phosphate, å¹¿å¢žç´ 802, high-efficiency compound fertilizer, etc., and also supplement trace elements such as boron, zinc, iron, manganese and magnesium.
2, hormones, flowers and fruits. Common hormones are "920", "Guangzunsu 802", "anti-fallin", "2,4--D", "palatzazole", etc.; 902 is used for citrus flowers and preserves fruit usually in flowers When spraying 2/3, spray 50ppm (one gram of 920 water plus 20 kg) can add 0.1-0.2% potassium dihydrogen phosphate or 0.1-0.2% borax; guangshen 802 yellow powder is insoluble in cold water and soluble in hot water. Usually, in the germination of citrus spring shoots to the initial flowering period, continuous use of 3-5 times 150ppm (1 g / pack + water 7.5 kg) every 7 days, has a controlled tip effect. The anti-fallin usually sprays 15-25ppm in the flowering period, the young fruit period, and the harvesting period one month; 2,4-D usually in the Xiehua 3--5 days, with 8-10ppm (1g 80% of 2) , 4-D plus water 80-100 kg) whole plant spray. Secondly, after the Xiehua young fruit period, 15-20ppm can be used to preserve fruit. In July, the fruit can be used for 20-25ppm strong fruit. Before harvesting, there can be 50ppm to prevent pre-harvest fruit drop. 3 Paclobutrazol Generally, one week before or after germination, when the spring shoot is 3mm, spraying 500ppm (15%.10g/package + water 3kg) or pouring 100g/mu under the tree has obvious control effect. Note that paclobutrazol can not be mixed with 920, and it is not suitable to use 920 again. It can also be used to spray borax to protect the fruit before and after flowering.
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