Orange is a fruit of Citraceae, and its skin is usually orange or orange-red. Oranges contain more vitamin C, sugar, fruit acid, malic acid and other substances, which can supplement the nutritional elements needed by the human body. Oranges like warm environment, not cold-resistant, more shade-tolerant, requiring deep soil layer, loose soil, fertile soil, good water permeability and air permeability.

In view of the high degree of commercialization of citrus, many varieties with their own characteristics have been born under the market demand, such as late-maturing summer oranges (Mi Xia Nai orange and olinda orange) to fill the market gap, and geographically protected varieties such as seedless orange and Gannan navel orange are beneficial to fresh eating. Many kinds of oranges are named after their place of origin (such as Xinhui Orange in China), and some kinds of oranges even have registered trademarks (such as Ji Xiang in the United States).

Fruit harvest:

According to the maturity, use and market demand of citrus fruits, the harvest time is determined. It is not suitable to pick fruits in rainy days and when the dew on the fruit surface is not dry. People who pick fruit should wear gloves, cut the fruit together with the fruit handle with a round-headed fruit scissors, then cut the fruit pedicle flat and handle it gently. Pick fruits from outside to inside and from top to bottom. The inner wall of all fruit containers should be smooth, and the harvested fruits should be transported to the packaging yard or storage warehouse in time. Avoid sun and rain.

Navel orange fruit used for storage after harvest is generally colored at 85% of the fruit surface, and it is best to pick it when the fruit is not soft. Picking too early, poor color and smell; Late harvest is sweeter, but it is not resistant to storage. In the first half of harvest, it is not suitable to apply chemical fertilizer and irrigate a lot; It is not suitable for harvesting within three or four days after heavy rain; The best picking time is sunny. Fruit pickers should not drink alcohol, cut their nails flat and wear soft-soled shoes.