Qiuyu vegetables should not be covered with plastic film

The reporter learned from interviews in rural areas: Seven or eight days after the autumn yew vegetables were planted, many vegetable farmers covered the mulch early. "When the seedlings are large, they cover the mulch and it is difficult to 'pick up' the vegetables out of the mulch. This is why most vegetable farmers cover the mulch early.

Why are vegetables covered with plastic film? First, mulching film can increase the temperature. It is understood that winter cover film can increase the ground temperature 2-5 °C. The second is to moisturize. Covering the plastic film can reduce the evaporation of surface water, reduce the relative humidity of the air, and help control the occurrence of diseases. Especially when it is not appropriate to water in the winter, the cover film can significantly increase the yield.

After 7 or 8 days after the planting of vegetables, the seedlings are still small, and if they are covered with plastic film, it is indeed very convenient to operate. However, farmers have not thought that prematurely covering the mulch would be very unfavorable to the growth of vegetables. Because of the premature covering of the plastic film, the surface layer is easy to form an environment where the temperature and humidity are suitable for root growth, which is not conducive to the deep rooting of the roots, and easily causes the capillary roots of the land to gather and the lower root system to be less. The shallow roots will reduce the plant's resistance to cold and stress. These capillary roots under the membrane and on the surface are very prone to injury. These watery roots and fertilizers can cause these root systems to be injured. Once they are injured, the young leaves will turn yellow or there will be insufficient water and nutrients to affect the plants. And the normal development of the fruit.

Therefore, it is not as soon as possible to cover the film. Qiuyu vegetables are different from winter and spring vegetables, winter and spring vegetables can be covered as soon as possible after the colonization of the film for the insulation, and autumn vegetables after planting, the temperature inside the greenhouse is high, the film can not cover the time too early, generally after vegetable planting12— Cover for 15 days.