First, shallow water: and should not be too large at low temperatures, the vegetables in the shed evaporate slowly, and the water requirement decreases accordingly. Therefore, the amount of watering should be small, the interval time should be longer, and flooding should be avoided. Watering or spraying should be appropriate, so as to avoid Low temperature and high humidity lead to vegetable roots. After the first two days of watering, it is easy to cause the humidity in the shed to increase. It is necessary to pay attention to reasonable ventilation to reduce the temperature and prevent the occurrence of diseases. Ventilation is generally preferred at high temperatures at noon.
Second, the time for watering is appropriate: Watering vegetables in winter should be arranged before and after noon. It is better to use after 10 o'clock in the afternoon and before 3 o'clock in the afternoon. The greenhouse temperature is higher during this period and the side effects after watering are the least. Avoid watering in the early morning and evening to prevent freezing of vegetables. Watering should use well water as much as possible, because the well water temperature is higher, which can reduce the physiological stimulation of vegetables.
The third is to look at the days of flexible watering: According to the weather conditions, to master the principle of "dry sunny, more pouring, less cloudy or not pouring, wind and snow avoid watering" principle. When the weather changes from sunny to cloudy, the amount of water must gradually decrease, and the interval should be appropriately extended. From cloudy to sunny, the amount of water should increase from small to large, and the interval time should be shortened.
Fourth, watering should focus on: The temperature of each part of the greenhouse varies greatly, and the amount of watering should also be different. In the southern part of the greenhouse and near heat sources such as stoves and flue gas, the amount of soil moisture and near evaporation is large, and the amount of watering can be appropriately larger; the temperature on the east and west sides of the greenhouse is low, the sunshine duration is also short, and the amount of watering should be properly reduced. some.
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