Brief introduction to nouns:

Chu orange (pinyin: chǔ chéng) refers to the sugar orange cultivated by Chu Shijian in Yunnan, which belongs to the category of sweet orange. It is round to rectangular in shape and orange in color.

Orange source:

Yunnan famous specialty Chu orange, sugar orange and sweet orange are famous for their sweet taste and thin skin. Sweet and slightly sour, it was planted by Chu Shijian, former chairman of the former tobacco king hongta group.

Origin of oranges:

Originally from southern China, it is distributed in southern provinces, but it is cultivated in Yunnan, Guizhou, Sichuan, Guangdong and Taiwan Province provinces. Chu orange is a specialty of Yunnan. 65438+ was introduced to Europe from China at the beginning of the 5th century and to America at the end of the 5th century. It contains a lot of sugar, a certain amount of citric acid and rich vitamin C, and has high nutritional value.

Fruit also contains vitamin P, which has high medicinal value. 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. Sweet orange varieties can be divided into early, middle and late maturity according to fruit maturity.

Citrus planting techniques:

It is required that the soil layer is deep (60㎝) and fertile; The ph value of the soil is 5.5-7.0; The slope of the orchard is less than 25 degrees. When planning a garden, there should be necessary roads, irrigation and drainage, water storage and ancillary building facilities. In terms of specific planning, we should concentrate on one place as much as possible and build gardens in places with good traffic and water conditions.

Pest control:

Strengthen cultivation management to prevent biased application of nitrogen fertilizer; In spring and summer, before new shoots germinate and fruits mature, mancozeb, cupric acid, zineb and chlorothalonil can be sprayed on the crown every 15 days for 3-4 times continuously. Timely drainage, improve the lighting and ventilation conditions in the park, and strengthen the prevention and control of trunk pests such as longicorn beetles.

Selecting disease-resistant rootstocks such as Fructus Aurantii, Fructus Aurantii Orange and tangerine, and replacing infected plants with disease-resistant rootstocks. Drug prevention: apply drugs after scraping the diseased spots. Commonly used drugs are carbendazim and thiophanate-methyl. Before and after flowering (March-May) and autumn (9-165438+1October) are the key periods for controlling red spider: the population density reaches 1-2 heads/leaf before flowering, and it needs to be controlled after flowering and when it reaches 5-6 heads/leaf in autumn.