What are the methods of raising vegetables? What are their advantages and disadvantages?

Vegetable seedling raising methods mainly include: single slope plastic greenhouse seedling raising, hotbed seedling raising and cold bed seedling raising. Advantages and disadvantages of various seedling raising methods:

(1) Single-slope plastic greenhouse: solar radiation is used as energy, and heating is not needed. By raising the temperature through the film during the day and covering the heat preservation material at night, suitable temperature conditions are created for the growth of seedlings. It has the advantages of rapid temperature rise, good heat preservation, low cost and easy operation, and is the main seedling raising facility at present.

(2) Hotbeds: According to different heat sources, there are three kinds of practical hotbeds, namely, brewing hotbeds, electric hotbeds and fire hotbeds. ① Hot brewing hotbed: heated with hot brewing materials such as horse manure. It has the characteristics of mild temperature rise. (2) Electric hotbed: set up an electric hot line in the sunshine bed or greenhouse. Raising and adjusting the ground temperature is beneficial to cultivating strong seedlings. (3) Fire path hotbed: fire path is built under the cold bed, and artificial firewood is used to heat the seedling facilities. The cost is low and easy to popularize, but the bed structure and bed temperature are not easy to master.

(3) Cold bed: that is, sunny bed. At present, it is mainly covered with film. During the day, the film is transparent to increase the temperature, and at night, it is covered with thermal insulation materials. Can be used in combination with large and medium-sized sheds. This method is flexible in application, low in cost, and can advance or postpone seedling raising according to local climatic conditions, with good application effect. Shading and cooling seedling raising: in high temperature and dry season, use straw covers, branches, sunshade nets, etc. It is effective to reduce the surface temperature, reduce the light for proper seedling raising and protect seedling raising by covering the sunshade net with scaffolding, which is worth popularizing in the future.

Generally speaking, single slope plastic greenhouse is convenient and easy to master, but according to the demand, hotbed or cold bed is needed to raise seedlings.