2. Due to different producing areas, the ripening time of navel orange is different. For example, the ripening time of red navel orange in September is around the middle of solar calendar 10, and it is listed at the beginning of 1 1. The orange peel of this variety is blue-green when it is just ripe, and it will turn orange when it stays on the tree until165438+1mid-October, which will make it taste better.
3. There are more than 100 countries and regions in the world producing navel oranges, among which the United States, Brazil, Spain, Italy, Mexico, Israel, South Africa, Algeria, Australia and Japan are the main ones. China navel oranges are mainly produced in Chongqing, Jiangxi, Hubei, Hunan and Sichuan. Navel oranges are also produced in Guangxi, Fujian, Zhejiang, Yunnan and Guizhou. There are few navel oranges planted in Guangdong and Taiwan Province provinces.
4. The annual rainfall suitable for navel orange planting is about 1600 mm, the annual average temperature is 18-22℃, the absolute minimum temperature is not lower than -5℃, the monthly average temperature is not lower than 7℃, the annual effective accumulated temperature is 5500-6500℃, and the air relative humidity is 70-.