The disadvantage of watering vegetables in winter at night
The first is to increase the humidity in the greenhouse. At night, the grass sheds and vents in the greenhouse have been closed, the temperature of the shed has decreased, the humidity in the shed has gradually increased, and the fog has been formed. The relative humidity is over 100%, and dew can be accumulated on the cucumber leaves. If watering is performed at night, it can be said to be "aggravated", and the humidity in the shed can be increased more, and a low-temperature and high-humidity greenhouse environment can be easily formed, which is conducive to the occurrence and spread of diseases. For example, the most suitable temperature for cucumber downy mildew occurs at about 18°C ​​and the humidity is above 83%.
The second is watering at night. Because of the slow metabolic activity of cucumber roots during the night, the resistance to drought is poor. If water is poured suddenly, it will have a greater impact on plant growth.
Under normal conditions, it is better to water in the winter before 10 o'clock in the morning.
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