I. Weather factors 1. Severe changes in weather During the peak period of fruit enlargement, the accumulation of fruit contents needs to absorb large amounts of water and nutrients. When the weather is fine, the moisture content of the soil will increase or decrease, and the moisture content of the flesh will fluctuate. When the pulp expands more than the skin can withstand, the peel will crack. 2, Sunburn damage due to excessive fruiting, fruit branches less, in the high temperature and strong sunshine, the fruit vulnerable to sunburn and cracking. Second, fruit dysplasia 1, early fruit development due to poor early fertilization or too little fruit, so that the small fruit development needs of nutrients, peel cell number is small, resulting in the skin during the fruit expansion period of fruit expansion is becoming thinner, easy to break. 2, low peel toughness due to the supply of calcium and boron and other nutrients in fruit trees is insufficient, enhance the pectin calcium deficiency of peel cells, reduced peel toughness, anti-blood pressure is low and easy to rupture. Third, improper fertilization measures In the peak of fruit expansion, one-time application of too much fertilizer, the fruit in the short-term absorption of too much fertilizer caused by the rapid expansion of pulp, resulting in a large number of peel peeling. Fourth, the orchards were improperly cultivated and some of the orchards adopted the Qingpi method, which attenuated the orchard's buffering effect on weather changes. As a result, a large number of cracks occurred in the summer and autumn when the weather changed greatly. V. Poor pest control Some orchards are ineffective in preventing and controlling citruses, red spiders, rust spiders, and canker diseases, which cause the skin to be deprived of water and injuries as a result of the aforementioned diseases and insect pests. This reduces toughness and aggravates cracking. Control methods: 1. Covering tree trays Covering tree trays with rice straw, weeds, etc. can increase the ability of the soil to absorb and retain rainwater, reduce surface temperature, impede and reduce soil moisture evaporation, and increase soil moisture content. It has been determined that the amount of water stored in the soil under cover is 45-70 mm more than that of the uncovered soil, and the amount of water evaporation is reduced by 21-63%, thereby increasing the citrus's ability to resist drought. 2. Timely irrigation of the citrus groves during the autumn drought should be diverted and irrigated. No irrigated conditions should be irrigated. Dig 1-2 cavities inside the canopy of each tree and slowly pour the water into the cavities. Then cover the straw to cool and moisten. Do not water with the ground. The ground watering is easy to evaporate. 3. Spray fertilizer with 2% of superphosphate calcium leaching solution (firstly soak calcium superphosphate with 10 times water for more than 24 hours, then filter it), or add 0.3% urea solution with 3% ash leaching solution, every 7-10 days Sprayed once and sprayed until near the time of picking. 4. When the split fruit is found to be cracked, it should be removed in time to prevent the bacteria from invading the parasite. 5. Spray lime sulfur mixture in order to reduce the invasion of bacteria from the top of the fruit, combine prevention and treatment of rust mites and spider mites, and spray the lime sulfur 0.3-0.4 degrees for 1-2 times on the canopy, in the morning or evening. It is conducted under hot sun. Dehydrated Celery,Air Drying Celery Leaf,Dehydrated Celery Stalks,Dehydrated Celery Flakes Xinghua Dongbao International Trade Co.,Ltd , https://www.xhdongbaofoods.com