Protected vegetables refer to vegetables planted by changing natural temperature conditions through artificial technical means. Common facilities are greenhouses and greenhouses. According to the data of the Ministry of Agriculture and Rural Affairs, nearly 30 kinds of vegetables, including cucumbers, tomatoes and eggplants, have basically achieved annual production by artificial means.

Now, Shouguang has built and put into use 18 intelligent parks, covering an area of 23,000 mu, all of which cover new technologies such as large-scale water and fertilizer integrated machine, intelligent temperature control and automatic light supplement. At the same time, more than 50,000 greenhouses have applied Internet of Things equipment, and vegetable greenhouses have become "green workshops".

In addition to Shouguang, Shandong, China has gradually formed five protected vegetable producing areas: Huanghuaihai, Bohai Rim, the middle and lower reaches of the Yangtze River, Northwest China, Northeast China and South China.

Key points of vegetable greenhouse construction:

1. Choose a place with abundant sunshine, shelter from the wind, dryness, good drainage and no soil infectious diseases.

2, plastic film maintenance.

(1) Try to avoid the mechanical damage of the shed membrane, especially the bamboo shed. Before the film is buckled, the protruding part of the frame surface should be flattened or wrapped with old cloth.

(2) When it is fixed with a spring, the card slot should be padded with a layer of old newspaper.

(3) Pay attention to avoid long-term contact between old and new membranes, so as not to accelerate the aging of new membranes, and be careful when ventilating.

(4) The film will be accelerated by freezing or exposure. When the steel pipe is exposed to the sun in summer, the temperature can rise to 60-70℃, thus accelerating the aging and crushing of the film. In the process of using the film, it is inevitable that there will be holes, so it should be repaired with glue or tape in time.