Skillful dehumidification, disease prevention and control in vegetable greenhouse saves effort

The high humidity environment is very beneficial to the germination and infection of a variety of pathogens. Once the disease occurs, it often causes a pandemic and seriously causes no harvest. In order to achieve the purpose of disease prevention, the following dehumidification measures can be adopted in production:

1. Choose non-dripping film. The selection of non-dropping film can obviously reduce the humidity, increase the temperature and humidity, and increase the light transmittance.

two。 Cover with plastic film. Plastic film mulching can reduce the evaporation and irrigation times of soil moisture, and it is also an important measure to reduce the air humidity in the greenhouse.

3. Get some air. It is the most basic way to reduce humidity by draining the moisture and changing it into the dry air. However, the relationship between heat preservation and dehumidification should be handled well. if the temperature drops too fast during ventilation, the vents should be closed in time to prevent vegetables from suffering from low temperature damage caused by a sudden drop in temperature.

4. Drip irrigation was used. Drip irrigation saves water and labor, and more importantly, it can effectively reduce the increase of air humidity caused by watering.

5. Scientific watering. Choose sunny day watering, plastic film mulching can be used under the film dark irrigation. The amount of water pouring should be strictly controlled to prevent the humidity in the shed from being too high. Appropriate ventilation after each watering, timely hoe to loosen the soil, cut off the soil capillaries, to prevent the soil capillary moisture rising to the surface, resulting in a large amount of soil moisture evaporation.

6. Spray powder or aerosol fumigation to prevent disease. Spray will increase the humidity in the shed, which is disadvantageous to the prevention and control of diseases. If powder spraying or aerosol is used, the control effect can be improved.

7. Naturally absorb moisture. Materials such as rice straw, wheat straw and quicklime can be put between rows to absorb moisture, and the purpose of reducing dampness and preventing disease can also be achieved.

Liu Jia, Agriculture and Animal Husbandry Bureau, Kaiping District, Tangshan City