Pay attention to humidity control in vegetable greenhouse

Now, with the decrease of external temperature, the decrease of ventilation, the increase of humidity and the increase of diseases, especially the high incidence of bacterial diseases, vegetable farmers should be reminded to adjust agricultural operations in time according to weather changes and pay attention to humidity control measures. Humidity control can be carried out from the following four aspects:

1. Reasonable ventilation and humidity reduction. Ventilation is the main means to adjust the temperature and humidity in the shed. In the current season, the temperature gradually decreases and the ventilation decreases. In order to reduce the humidity, vegetable farmers are advised to have sectional ventilation. When the temperature is low, pull the small tuyere to let out the air, and gradually enlarge the tuyere as the temperature increases. If the heat preservation performance of the shed is good, vegetable farmers can also be properly ventilated at night to ensure a suitable environment in the shed.

two。 Plastic film and straw cooperate to reduce water evaporation. That is, the planting line laying plastic film to reduce soil water evaporation, especially after watering, the effect is more obvious. At the same time, laying straw in combination with the operation line can play a regulating role. When the humidity is high at night, the straw can absorb part of the moisture. During the day when the humidity is low, the straw can release its own stored water, which can play a role in regulating air humidity. Straw can also avoid stepping on the hard surface during manual operation.

3. Improve irrigation techniques. The traditional flood irrigation method not only wastes water, but also easily retts the root, which increases the humidity in the greenhouse and causes diseases. New irrigation techniques such as drip irrigation and sprinkler irrigation can make water gradually infiltrate into the soil and improve water use efficiency. At the same time, on the same day and the next day of watering, the ventilation should be increased with the increase of temperature, and the moisture should be drained as soon as possible.

4. Change the way you use the medicine. At present, the medicine used by vegetable farmers is still mainly spray, which is bound to increase the humidity in the shed. It is suggested that when spraying medicine on a sunny day, it is best to spray it around 3 o'clock in the afternoon, and try to spray it before dark to ensure that the liquid is fully absorbed. In case of continuous cloudy days, vegetable farmers can choose automatic spraying machine, fogging machine, and reduce the amount of medicine. In addition, the medicament used in the root had better be irrigated to ensure the efficacy and reduce the soil moisture at the same time.

Li Bingcai