Vegetable cultivation in greenhouses is to use greenhouses to cover plastic film to grow vegetables. It is to artificially create a suitable ecological environment, adjust the vegetable production season, regulate market demand, and promote high-quality and high-yield vegetables. It is one of the effective means to increase farmers' income. Reasonable watering is an important measure to ensure the robust growth of greenhouse vegetables and increase production. Watering the greenhouse should take the following four countermeasures:
One is shallow water: and should not be too large. At low temperatures, the vegetables in the shed evaporate slowly, and the water demand is reduced accordingly. Therefore, the watering amount should be small, and the interval time should be longer. Avoid flooding with large water. It should be watered or sprayed to avoid the low temperature and high humidity leading to vegetable roots. The first two days after watering, it is easy to cause the humidity in the shed to increase, and should pay attention to reasonable ventilation and temperature reduction to prevent disease. Ventilation is generally preferred when the temperature is high at noon.
Second, the watering time is appropriate: greenhouse watering should be based on the climate characteristics of the season to choose the appropriate time to arrange watering.
The third is to look at the sky for flexible watering: according to the weather conditions, master the principle of “appropriate watering on sunny days, less pouring or not pouring in cloudy days, avoiding watering in wind and snowâ€. When the weather turns from sunny to cloudy, the amount of water should be gradually reduced, and the interval should be appropriately lengthened. When the weather turns from cloudy to sunny, the amount of water will be small to large, and the interval will be shortened from long to long.
Fourth, the watering should be focused on: the temperature difference between the various parts of the greenhouse is large, and the amount of watering must be different. In the south of the greenhouse and near the heat source such as stoves and flue, the soil moisture and the amount of evaporation are large, and the watering amount can be appropriately larger; the temperature in the east and west of the greenhouse is lower, the sunshine time is shorter, and the watering amount should be less. some. Li Wei
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