Citrus fruit generally produces fruit cracks between August and September, and the natural fruit cracking rate reaches 10%. In case of prolonged drought or prolonged drought, heavy rain or excessive rainfall or excessive application of phosphate fertilizer, the fruit cracking rate will increase, affecting the quality of citrus. high yield. Right now it is citrus fruit enlargement, autumn shoots are waiting for the germination period, plus the weather in recent days is very hot, so farmers should be prepared to prevent drought, in order to reduce the occurrence of cracking. According to my experience in the field, the following simple measures can be taken to prevent: 1. Adjusting tree nutrients, applying less phosphate fertilizer, increasing potassium fertilizer, nitrogen fertilizer, and farmyard fertilizer can reduce cracking. The specific operation is to dig 30-40 cm deep on both sides of the crown of the result tree from late July to early August. 30 kg of animal manure, 0.2 kg of urea, 0.2 kg of potassium chloride, and 3-5 kg ​​of plant ash can be used instead of other Potash. In the morning or afternoon of the day, potassium sulfate or potassium dihydrogen phosphate may also be applied at a concentration of 0.3% (once per week). 2. During the drought from July to August, in case of soil drought, water should be used to fight drought. Spray the wet canopy with a sprayer and then water. Crop straw and weeds can be used to cover the ground. In this way, the tree tray keeps the soil moisture even, so as to enhance the orchard's water storage and water holding capacity, thereby reducing the evaporation of water and reducing the cracking of fruit. By winter, the cover can be buried deep in the garden and used as fertilizer. 3, to strengthen the management of the cultivator. At the beginning of the drought, shallowly plowing 8-12 cm in the tree trays, and plowing 15-25 cm deep between rows. After the rainfall, remove the water in a timely manner to prevent the imbalance of soil moisture. This will prevent the fruit from absorbing too much water and expanding the inner diameter, resulting in cracking. . 4, control the summer and autumn shoots a large number of hair, long branches suitable for short-cutting topping heart, excessive summer and autumn shoots when the germination to 2 cm when erased in time, can effectively control the cracking fruit. 5, do a good job of fruit thinning. Generally in July, small fruit, malformed fruit, diseased fruits, and insect pests should be removed to ensure normal fruit growth and reduce fruit cracking. For cracked fruits, they should be kept on the tree, not removed, and water vaporized through the cracks to maintain the relative balance between soil moisture and tree moisture, and to avoid new cracking. 6, with 200ppm concentration of "90%" spray fruit, there is anti-crack effect, but also to promote fruit enlargement effect. 7, with urea 150 grams, 100 grams of potassium chloride, 100 grams of vinegar, lime 100 grams of water 50 kilograms sprayed, cracking effect, it is best to spray the crown in the early morning or evening. 8, reasonable pruning. Keep 3-4 leaves on the fruit to avoid direct sun rays and cause cracks.