Four Misunderstandings of Covering Plastic Film in Greenhouses in Autumn

The weather turns colder and the temperature drops significantly in many places. Once the temperature drops sharply, crops will inevitably suffer low temperature damage. Greenhouse growers should cover with mulch film at the end of autumn and early winter to raise the ground temperature, while improving the physical and chemical properties of the soil and inhibiting the growth of weeds. The operation of mulching film is simple, but four misunderstandings of film mulching should be avoided.

The mulch sticks to the base of the plant stem

When covering with mulch film, do not put the mulch film close to the roots and stems of the plant, which may cause the phenomenon of dead seedlings. Because the mulching film is close to the stems, when the temperature is high, the water evaporated from the soil will condense into water droplets on the mulching film and flow down the stem base. Day after day, a high temperature and high humidity environment is formed at the stem base. Plant diseases or even dead seedlings.

Cover mulch only in the operation line

In order to reduce costs, growers only lay mulch in the shed. This phenomenon should be avoided. Because the mulch film laid in the operation line cannot take advantage of the mulch film, but highlights its disadvantages. In the production of greenhouse vegetables, the most important role of mulching is to reduce the humidity in the greenhouse and reduce the occurrence of diseases. However, the practice of covering the mulch in the operation row and not covering the planting row is not good for reducing the humidity in the shed, because most of the time when the vegetables are watered, the planting row is watered, and the planting row does not have much effect on reducing air humidity. Nor can it have the effect of heat preservation.

Full shed covering film

Covering the whole shed with plastic film can effectively inhibit the production of weeds in the shed, but it also inhibits the gas exchange between the soil and the air, especially after watering, the soil has poor air permeability, which prevents root respiration, poor root growth and absorption The ability of nutrient elements is weakened, which seriously affects plant growth.

For sheds that need to be covered with a full shed, it is recommended to use steel wire or bamboo poles to support the planting row mulch, and set one at a distance to achieve watering under the film, which not only improves the air permeability of the soil, but also makes it difficult for moisture to evaporate. Reduce the humidity in the shed. The operation method is to cover crop straw, which not only raises the ground temperature, but also regulates the humidity in the shed.

Premature coating in the shed

Film mulching is too early in autumn. After the plants are planted, the outside temperature has not yet decreased. Immediately mulching will cause excessive temperature increase and prone to stuffy roots. On the other hand, after mulching, a moist environment is formed on the ground surface, which is not conducive to rooting. Growth may lead to failure of squatting seedlings, making it difficult to cultivate strong seedlings. According to the weather conditions, it is recommended to cover with mulch 15 days after planting, which is conducive to piercing the roots of seedlings and cultivating strong trees.

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