The vegetable cultivation in greenhouses is carried out under the conditions of artificial facilities and the environment is relatively humid. In the closed conditions of the greenhouse, the relative humidity of the air can reach more than 80%, and water film or water droplets form on the leaves of vegetables. This high-humidity environment is extremely beneficial to the germination and infestation of various pathogenic bacteria. Once a disease occurs, it often causes a pandemic of the disease, which severely results in an unsatisfactory production. For the purpose of preventing diseases, the following dehumidification measures can be adopted in production:
1. Use drop-free film. The use of a drop-free film can significantly reduce the humidity, which is conducive to increasing temperature and humidity, and can also increase the amount of light transmitted.
2. Coverage of plastic film. Covering with plastic film 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. Ventilation. Excluding moisture and changing into the dry air outside, this is the most basic method of dehumidification. However, in order to deal with the relationship between heat preservation and dehumidification, ventilation must be carried out under higher temperature conditions, otherwise it will cause a sharp drop in the indoor temperature. If the temperature drops too quickly during ventilation, it is necessary to close the vents in time to prevent the temperature from dropping suddenly. Suffer from low temperature hazards.
4. Using drip irrigation. Drip irrigation water and labor, more importantly, can effectively reduce the increase in air humidity caused by watering.
5. Scientific watering. Watering is the main factor that causes indoor humidity to increase. It can be done on a sunny day, and the film can be covered with subsurface irrigation. To strictly control the amount of water, to prevent excessive humidity in the shed. After each watering, the air is properly ventilated and the soil is removed in time to reduce soil moisture and air humidity.
6. Dusting or aerosol fumigation and disease prevention. Spraying often increases the humidity in the shed, which is not very beneficial for disease prevention and control. If dusting or aerosols are used, the above drawbacks can be avoided and the control effect can be improved.
7. Wet cultivator. By cutting off the capillaries of the soil, it is possible to avoid the capillary water in the soil from rising to the surface and to avoid the large amount of evaporation of the soil moisture. When the temperature of the greenhouse is high, the ground surface is shallow and surface water evaporation is accelerated.
8. Naturally absorbs moisture. Can use straw, wheat straw, quicklime and other materials placed in the line between the adsorption of moisture, can also achieve the purpose of reducing humidity and disease prevention.
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