Matters needing attention in watering vegetables in greenhouse

Greenhouse vegetable cultivation uses plastic film covered in greenhouse to grow vegetables, which is to artificially create a suitable ecological environment, adjust vegetable production season, adjust market demand, and promote high quality and high yield of vegetables, which is one of the effective means to increase farmers' income. Rational watering is an important measure to ensure the healthy growth and increase the yield of vegetables in greenhouse. The following four countermeasures should be taken to water the vegetables in the greenhouse.

First, watering: and should not be too large at low temperature, the evaporation of vegetables in the shed is slow, and the water demand is reduced accordingly, so the amount of water should be small, the interval time should be appropriate for a long time, and flood irrigation should be avoided. It is appropriate to irrigate or spray, so as not to cause vegetable retting roots with low temperature and high humidity. In the first two days after watering, it is easy to increase the humidity in the shed, so attention should be paid to reasonable ventilation and cooling to prevent diseases. Ventilation is generally appropriate when the temperature is high at noon.

Second, the watering time is appropriate: the watering of vegetables in the greenhouse should be arranged according to the climatic characteristics of the season.

The third is to look at the weather and water flexibly: according to the weather conditions, grasp the principle of "appropriate more watering in sunny days, less watering or no watering in cloudy days, and avoid watering in snowy days". When the weather changes from sunny to overcast, the amount of water should be gradually reduced, and the interval time should be lengthened appropriately; when the weather changes from cloudy to sunny, the amount of water will change from small to large, and the interval time will be shortened accordingly.

Fourth, watering should focus on: the temperature of different parts of the greenhouse varies greatly, and the amount of water should also be different. In the south of the greenhouse and near the furnace, flue and other heat sources, the soil moisture and near evaporation, the amount of water can be appropriately larger; the temperature on the east and west sides of the greenhouse and the north is lower, the sunshine time is also short, and the amount of water should be less. Li Liyun