However, the economic planting areas of citrus in China are mainly concentrated between 20 and 33 north latitude and below 700 ~ 1000m above sea level. It is produced in the water system in the south of the southern slope of Qinling Mountain, the southern slope of Funiu Mountain and the southern Dabie Mountain, the southeast of Taiwan Province Province, the south of Hainan Island and the southwest of southeastern Tibet to low altitude areas.
Cold-resistant site 9 ~ 1 1. There are 19 provinces (municipalities and autonomous regions) producing oranges in China, including Taiwan Province province. Among them, Taizhou, Fujian, Hunan, Sichuan, Guangxi, Hubei, Guangdong, Jiangxi, Chongqing, Taiwan Province and other provinces 10 are the main producing provinces of citrus, followed by Shanghai, Guizhou, Yunnan, Jiangsu and other provinces (cities), and Shaanxi, Henan, Hainan, Anhui, Gansu and other provinces are also planted. Citrus is grown in 985 counties (cities, districts) in China.
Garden selection
Citrus orchards should choose areas without obvious freezing damage, requiring deep soil layer, good drainage and ventilation, rich organic matter, convenient irrigation and convenient transportation. The hills and mountains are below 800 meters above sea level and the slope is below 25. In areas with freezing injury in winter, the southeast slope should be chosen, and gardens should not be built in low-lying areas with poor drainage and valleys where cold air is easy to stagnate. When the garden is built on gentle slopes, rivers and paddy fields below 5, attention must be paid to drainage.
Natural barriers and large water bodies can be used to adjust the temperature, and gardens can be built around them. Building a garden requires a lot of surrounding environment. It is required that the citrus produced should be robust and free from pests and diseases, and the surrounding air quality, irrigation water quality and soil environmental quality should be fully understood. The standard of pollution-free food formulated by 200 1 says that the environmental quality of production process should be considered.