1, temperature: Longan grows in the south subtropical region, likes warm and humid climate, can endure short-term frost, and will not freeze to death in a short time at the low temperature of 0-4℃. The annual average temperature in Putian, Fujian, China is 20-22℃, and that in Sichuan is about 65438 08℃. Short-term low temperature in winter is beneficial to the differentiation and formation of longan flower buds.
2. Moisture: average annual precipitation in longan producing areas1200-1600 mm. ..
3. Illumination: Longan is a positive tree species and needs sufficient sunshine.
4. Soil: Longan has strong adaptability to soil. In the main producing area of Putian, Fujian, China, mainly red sandy soil and clay can grow. As long as the topsoil is deep and the drainage is good, almost all kinds of soil can adapt. Sandy loam is the best, followed by sandy red soil and clay. The pH value of soil is 5.4-6.5, which is most suitable for growth, while alkaline soil is not suitable for planting.
Extended data
The propagation methods of longan include grafting, high pressure and seed seedling. Because of the great variation and uneven quality of seedlings cultivated by seeds, it takes 15-20 years to blossom and bear fruit after planting, and the economic benefit is poor, so seedlings are generally not used in production. In order to ensure the excellent characters of varieties and put them into production as soon as possible, grafting seedling and high pressure seedling are common in production.
Grafting: there are many grafting methods, such as bud grafting, tongue grafting, abdominal grafting, splicing, cutting grafting, docking and bud grafting. The methods of bud grafting, tongue grafting and bud grafting are simple and feasible, and the survival rate is high. In addition, in some areas, high grafting is used to transform seedlings with small fruit, poor quality and low yield to improve economic benefits.
Baidu encyclopedia-longan