First, change characteristics
In a solar greenhouse, especially at night, the relative humidity of the air is often above 90% or saturation. The air humidity in the greenhouse is greatest after watering and decreases with time afterwards. Humidity in the air is a significant feature of the greenhouse environment. High humidity is detrimental to the growth and development of most vegetables, and diseases caused by excessive humidity often occur or spread.
Second, control measures
1. When producing vegetables in a greenhouse in the winter, it is not enough to take measures to release air in the morning to reduce the relative humidity of the air. The correct method is to open the grass in the morning, if there is a fog in the shed, open the vent vent 20 to 30 minutes, and then close the vents, as soon as possible to increase room temperature, the relative humidity of the air naturally dropped. The temperature in the greenhouse is based on the temperature. When the temperature is not guaranteed, it is generally not released.
2. The principle of “few and diligent†should be mastered in watering, and flood irrigation should be avoided to avoid causing a low-temperature and high-humidity soil environment and affect the growth and development of crop roots. Within one day, watering should be carried out in the morning, and watering should be performed. Ventilate in time to reduce humidity.
3, according to the different ways of watering, watering time is different. Judgments based on crop growth, soil moisture, weather conditions, etc. should not be generalized. In general, water is poured every 15 to 20 days. Water can only be poured from the middle of the ditch, and must not be flooded.
4. Before watering, it is best to pump water out of the ground and put it in the reservoir. After reaching a certain temperature, water it. If there is no reservoir, it should be watered in stages in deep winter to avoid watering in the greenhouse. The temperature drops too fast.
5, the whole film cover can reduce the air humidity in the greenhouse.
6. When using pesticides to control pests and diseases, promote the use of dust or aerosols to prevent pests and diseases.
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