The mulch is close to the base of the stem
Serious dead
The sweet pepper planted by Master Li, a vegetable farmer in Xinglong Town, Sheqi County, has a large dead tree phenomenon, and the base of the stem has become dark brown and water-soaked. After careful inspection and inquiry, I learned that when Master Li covered the mulch, the mulch and the stalks were close together. When the temperature was high, the water evaporated from the soil condensed on the mulch into water droplets, which flowed down the base of the stem. On the day, a high temperature and high humidity environment was formed at the base of the stem, causing a serious occurrence of the sweet pepper blight.
Remind the vegetable farmers to remember that when covering the mulch film, do not stick to the base of the vegetable stem. Try not to cut the mulch with a blade. Instead, use your fingers to lick the mulch to ensure that the mouth is large and will not be closed. Generally, the diameter is 5-8 cm. In the high temperature stage, the two sides of the mulch film are rolled up to prevent the ground temperature from being high. When the temperature drops, the mulch film is opened again, and the adjacent two mulch films are sandwiched by the grafting clip so that the mulch does not contact the stalk.
Cover all over the shed
Affect root growth
The spring stalked tomatoes planted by Yuan Shifu of Houping Town, Zhenping County this year are weak, the stems are thin, the leaves are yellow, and there are serious phenomena of falling flowers and fruits. Through field interviews, technicians found that the mulch covered by Master Yuan is close to the ground, affecting the gas exchange between the soil and the air. Especially after watering, the soil permeability is very poor, causing the roots to be blocked, the roots are poorly grown, and the nutrients are absorbed. The ability is weakened, and the growth of tomatoes is naturally weak.
It is suggested that the planting line should use the steel wire or bamboo pole to support the film. Every 50 cm, the film is covered on the stalk from the south to the north, so that the film can be watered, which improves the soil permeability. It also makes it difficult to volatilize moisture and reduce the humidity in the shed; while the operation line is best to cover the crop straw, which not only improves the ground temperature, but also regulates the humidity inside the shed.
Early autumn mulch vegetable mulching is not conducive to deep rooting
In the winter, as the temperature decreases, the vegetable growers usually use the “punching method†to cover the mulch. According to the practice suggestion, in the cultivation of greenhouse vegetables, the time of covering the mulch film should be determined according to the specific climatic conditions. For example, after the planting of autumn cucumber, the external temperature is high. If the film is covered immediately, on the one hand, because the film is too warm, it is easy to appear boring; on the other hand, after the film is covered, a moist environment is formed in the surface layer, which is not conducive to the root system. Growing up may cause the failure of the seedlings, and it is difficult to cultivate strong seedlings and strong trees. Therefore, it is recommended to cover the mulch after 15 days of planting according to the weather conditions, which is conducive to the rooting of the seedlings and the cultivation of strong trees.
Cover the mulch only in the operation line
Equivalent to no cover film
When I visited, I also found that many vegetable farmers only covered the operation of the shed in order to reduce the cost, but the planting line did not cover the mulch. However, such an approach not only does not take advantage of the film cover, but highlights the disadvantages and the effect is very poor. In greenhouse vegetable production, the most important role of plastic film mulching is to reduce the humidity in the shed and reduce the occurrence of diseases. The practice of covering the mulch and not covering the planting line is not good for reducing the humidity in the shed, because when the vegetables are watered, most of the time it is planted, and the planting line does not cover the mulch to reduce the humidity of the air. To what effect, it can not play the role of insulation. In the operation line covering the mulch film, the drawbacks are also obvious, so that the soil permeability in the operation line is greatly reduced, which affects the growth and development of the root system.
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