1, spring ahead of time, fall delayed, for a good price for a month of valuable time, it is this period of time, the morning of the sales offer on the huge changes.

2, rain, do not underestimate this point, in the rainy season, the land simply can not be managed, the quality of many crops is seriously impaired, and the lack of shed can be normal output.

3, easy to control, conducive to high yield, such as pests and diseases, in a kind of open environment, it is difficult to control, but in the shed can close the door, some rain-borne diseases also stop in the shed, all cultivation operations can be carried out at any time.

4, it can improve farmers' income, improve the level of industrialization, improve the ability to withstand natural disasters, extend crop growth time, increase crop yields and so on. The development of greenhouse vegetable production, not only fundamentally solve the contradiction between the supply and demand of fresh and fine vegetables in winter in the northern region of our country, reduce the "southern vegetables northward" to the pressure caused by railroad transportation, saving energy: at the same time, it is also for the adjustment of the rural industrial structure and the farmers to become rich and run into prosperity to provide an effective way.