Five fields should not cover film
First, clay land. The soil is too viscous, there are too many slags, the mulch is not tightly attached to the ground, the membrane material is damaged when there is no wind, and the wind blows when there is wind, so the mulch film is lost. Second, coarse sand. Coarse sand tends to have less moisture. If it is covered with a plastic film, it will cause the temperature to be too high at noon. The drought on the seedlings will be more pronounced. Third, pure dry fields. With the exception of the rainy season, dry land without irrigated conditions will actually worsen the drought after it is covered with plastic film. Fourth, grass more fields. In the too many plots of perennial weeds, herbicides were sprayed before sowing, but only seedlings that germinated by grass seeds could be killed, and hard grass in perennial roots could not be covered. V. Barren fields. Because the land is too thin to meet the requirements of crops, although the mulch is covered, the effect of increasing production and income is often not achieved. China Agricultural Network Editor