Problems of Watering Vegetables in Greenhouse
Reasonable watering is an important measure to ensure the robust growth of greenhouse vegetables and increase production. In winter, when the temperature is low, watering vegetables in greenhouses is different from other seasons. It is necessary to look at the sky, look at the land and see the situation of the seedlings to avoid side effects. According to experience, watering vegetables in greenhouses should pay attention to the following:
The first is pouring shallow water and should not be too large. At low temperatures, vegetables in the shed evaporate slowly, and the water requirement decreases accordingly. Therefore, the watering volume should be small and the interval time should be longer. Avoid flooding irrigation, should be watering or spraying is appropriate, so as to avoid low temperature and humidity caused the roots of vegetables. 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.
The second is that the watering time should be appropriate. Watering of vegetables in winter should be arranged before and after noon. It should be better after 10 o'clock in the morning and before 3 o'clock in the afternoon. The greenhouse temperature is higher, and the side effects after watering are minimal. 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, we should master the principle of “a fair amount of water in the sunny days, little or no pouring in cloudy days, and no watering in the wind and snow daysâ€. 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. There is a big difference in the temperature of each part of the greenhouse, and the amount of watering must also be different. In the southern part of the greenhouse and near the stove and flue, the amount of soil moisture evaporates is large, and the amount of watering can be appropriately larger. The east and west sides of the greenhouse are cooler in temperature on both sides and in the north, and the sunshine hours are also short. The amount of watering should be appropriately less.
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