Suppression of disease epidemics reduces the humidity in the shed
We all know that the high humidity in the shed is an important factor in the occurrence of morbidity. Therefore, how to reduce the humidity in the greenhouse is the key to prevent and control the disease epidemic. Therefore, the following points must be made in production.
First of all, the ventilation dehumidifies. Sectional ventilation is a good method of ventilation. The size of vents can be gradually adjusted with the temperature, extending the ventilation time. After about an hour of drafting the dumplings in the morning, ventilation began. If the temperature is low, the vent is small, 5cm can be; if the temperature is high, the vent is large. In the afternoon, the temperature was lowered to 25°C and the vent was closed. At 20°C, the vent was closed.
Second, the entire shed covers the mulch and covers the straw between rows. The full-cover mulch can minimize surface transpiration. After the film is tightly sealed, there is basically no water vapor that evaporates into the air from the ground, reducing the source of water vapor in the air. Covering the film is best 10-15 days after planting. At this time, the planting seedlings will end slowly and have not yet entered the rapid growth period. Straw stalks between the rows can absorb part of the moisture during the night when the humidity is high, and release the moisture during the day when the humidity is low, and play the role of regulating the moisture in the air.
Again, abandon flood irrigation, using drip irrigation and micro-spraying. The traditional flood irrigation method not only wastes water, but also causes excessive air water vapor in the shed, which is easy to cause diseases. New irrigation techniques such as micro-spraying allow water to penetrate rapidly into the soil, reducing watering and reducing the amount of water entering the air. Among various micro-irrigation technologies, micro-injection technology is relatively mature. At present, the investment for installing a micro-spray irrigation system per mu is only 600-1000 yuan, and the practicality is very high. The micro-spray irrigation system can spread it to the planting line before covering the film, and it can be connected easily and easily.
In addition, to ensure the diversification of spray methods, the use of aerosols and dust at low temperatures. The winter and spring seasons are the season of high incidence of disease, and spraying and preventing diseases are very frequent. Even if there is no disease, spray the protective agent and prevent it every 7-12 days. At present, vegetable sprayers mostly spray, which also greatly increases the water vapor content in the air. If aerosols or dusts are used, the water for spraying can be eliminated to prevent the humidity in the shed from rising.
Of course, adjusting the temperature difference between day and night can reduce the degree of moisture saturation in the air. Different temperatures, the saturation of water vapor in the air is very different. The higher the temperature, the higher the saturation point of water in the air; In the case of high humidity, the temperature also determines the rate of moisture loss in the air. After watering, high-temperature ventilation can quickly dissipate moisture from the shed, which is better than early ventilation and the temperature cannot be raised.
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