Based on my own practical experience, the author concluded that when watering greenhouse vegetables in the winter, special attention should be paid to the following five points to ensure the high yield and quality of greenhouse vegetables.
The first is to look at the days of flexible watering, according to the weather conditions, to master the principle of "every day the water is poured properly, the sky is less or not poured, snow and snow should not be watered" 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.
Second, the watering time should be arranged in the greenhouse in winter and vegetables 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 during this period is relatively high, and the side effects after watering are the minimum. 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.
Third, the watering should not be too large at low temperatures, the shed slow evaporation of soil moisture, the corresponding reduction in the amount of water, so the amount of watering should be small, the interval time is appropriate longer, avoid flooding irrigation, so as to avoid the shed within the low temperature and humidity environment, Causes vegetables to pick roots.
Fourth, there should be a large difference between the temperature of each part of the side shed where the water is poured and the amount of watering. In the southern part of the greenhouse and near heat sources such as stoves and flue gas, there is a large amount of evaporation of soil moisture, and the amount of watering can be appropriately larger. The east and west sides of the greenhouse have lower temperatures on both sides and in the north, and the sunshine hours are also short, and the amount of watering should be appropriately less.
Fifth, management after watering Watering in winter can easily cause problems such as low temperature, high humidity, and many diseases in the greenhouse. Therefore, the first two days after watering, the temperature should be raised to about 40°C at noon first, and then the shed should be raised for one hour to increase greenhouses. Inland temperature, and then promptly drain moisture, reduce the humidity inside the greenhouse to reduce the occurrence of pests and diseases in greenhouses.
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