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What are the types of vegetable greenhouse construction technology?

Greenhouse construction technology varieties:

There are various ways of greenhouses. According to the skeleton materials, they can be divided into bamboo and wood greenhouses and steel pipe greenhouses. According to the number of greenhouses, single-story greenhouses and continuous greenhouses can be divided.

At present, the vast majority of farmers build bamboo and wood greenhouses, which are low in cost, but have poor strength and short life, only about 2 years, and have the disadvantages of weak disaster resistance and inconvenient operation. The multi-story shed is made up of steel pipes, with high strength (up to 15 years of life) and strong disaster resistance (generally resistant to 10 typhoons); large sheds, good ventilation and lighting conditions, high land utilization and convenient operation. However, the high cost (more than 80 yuan per m2) is unaffordable for farmers and general enterprises.

A single steel pipe greenhouse not only has the advantages of a continuous greenhouse, but also has a much lower cost, 25-30 yuan per m2. Farmers can consider replacing bamboo and wood greenhouses. Vegetable factory seedlings Ancient people said: "There are no meat in three days, and Japanese food is indispensable." Vegetables are indispensable foods for people's lives. This is because vegetables contain multiple nutrients and are the main source of inorganic salts and vitamins. Especially when there is a lack of milk and fruits in the diet, vegetables are particularly important. Vegetables can be generally divided into four categories: leafy vegetables, rhizomes, melons, and fresh beans.

The root vegetables are mainly carrots, white radishes, potatoes, alfalfa, yam, sweet potatoes, onions, garlic, bamboo shoots, taro and so on. These vegetables are mainly starch, with high sugar content, such as carrots, sweet potatoes, taro, potatoes, yam, etc., which can partially replace the staple food. Other nutrients are different, such as carrots containing iodine, bromine, amylase; potatoes containing potassium salts and vitamin C; garlic contains a variety of inorganic salts, carrots contain higher carotene. The melons and vegetables are mainly melon, loofah, pumpkin, bitter gourd, cucumber, gourd, tomato, eggplant, pepper and so on.