Why should farmers cover plastic film when sowing in the spring?
The film mulching can improve the soil and ground temperature and moisture status, to improve the soil temperature, soil water content, improve soil properties and improve soil nutrient status and fertilizer utilization rate, improve light conditions, reduce weeds and pests.
Negative effects of plastic mulchPlastic film mulching has both negative effects and positive effects such as: plastic film mulching has the role of water retention, but hindered the outside precipitation into the ridge body parts, if does not take the corresponding ridge or other measures may lead to crop water deficit occurred in the long-term flourishing, affect the normal growth; when continuous rainfall when it is easy to cause serious water damage, the soil permeability is bad, water evaporation is blocked, also affect the growth of crops. Therefore, combined with the actual production and local, making mulch production technology feasible, make full use of the film role, take corresponding measures of success is covered with plastic film base.
Reduce the damage of weeds and aphidsMulch can inhibit weed growth. In general, the coverage of weeds covered by mulch is reduced by more than 1/3. If combined with herbicides, the effect of weed control is more obvious. After spraying herbicide, plastic film and film covering weeds can reduce 89.4~94.8%. The film has a reflective effect, and can partly avoid aphids, inhibit the propagation of aphids, and reduce the spread of hazards and diseases.
1. warming up and promoting the decomposition and release of soil nutrients2. moisturizing, improve the survival rateSoil moisture, except irrigation, mainly comes from rainfall. After covering the membrane, on the one hand, because of the barrier of plastic film, the evaporation of soil water is reduced and the dissipation is slow; and the water drops formed in the membrane and then fall into the soil table, thereby reducing the loss of soil moisture and protecting soil moisture. On the other hand, the film can also be in the excessive rainfall, prevent the rain poured into the ridge, can play the role of waterlogging.3. promote growth and developmentThe application of plastic film mulching increased soil temperature and humidity, which was beneficial to early growth and rapid growth, and promoted the growth and development of plants. The growth period of plastic mulch is shortened to about one week.
