To make the lime sweet, you can put the lime in your hand and knead it repeatedly. In the process of repeated kneading, because the orange is damaged by impact, the acidity decreases and the proportion of internal sugar increases, thus making the orange sweet.

Apples, bananas and other fruits contain ethylene gas, which will stimulate crop growth and promote fruit ripening. Oranges can be put together with ripe fruits, so that oranges can mature under the action of ethylene gas, and the taste will gradually become sweet. To sweeten oranges, warm water of about 40℃ can be prepared the night before, and limes can be soaked in warm water. Soak for 20 minutes, let the lime take a comfortable bath in warm water, and then take it out to eat. At this time, you will find that oranges taste sweeter.

Classification of citrus species

Oranges are mainly divided into sweet orange, navel orange, blood orange, sugar orange and red orange. In China, young fruits and fallen fruits can be dried and used as medicine. Storage and transportation resistance. The maturity varies greatly, which can prolong the supply period of fresh fruit and processing raw materials. Citrus varieties can be divided into early, middle and late maturity according to fruit maturity. 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.

Some varieties of oranges have been produced in the long-term cultivation process of human beings, and some varieties have been preserved because they are beneficial to human beings. This species often crosses with other citrus plants to produce better varieties. Sometimes cultivated varieties of citrus plants also contain orange characters, but in fact they do not belong to this species.