How to control the humidity in a greenhouse?

How to control humidity in greenhouses? There are many specific measures that can be used, and the common methods are:

Fan wet curtain

The fan wet curtain system can also be regarded as a kind of mechanical ventilation for greenhouses, so that all incoming air passes through the wet curtain and then enters the greenhouse environment. The surface of the wet curtain is wavy, and this shape can make the air contact the surface of the wet curtain to the maximum extent. In order to prevent the high salt content in the water from causing crystallization on the wet curtain and reducing its working efficiency, about 10% of the water can be drained. In addition, it should be noted that the fan wet curtain system is often not turned on in the summer night, and moss is easy to grow on the wet curtain, thereby reducing working efficiency.

Deep ditch and high ridge

Choose a plot with high and dry terrain and convenient drainage to buildA Solar Greenhouse. When preparing the land, be sure to dig drainage ditches around the solar greenhouse, and adopt a deep ditch and high ridge cultivation method in the shed, with a ridge height of more than 20cm to filter water and drain water.

Use drip-free film

Anti-fog agent is added to the drip-free film. When the temperature of the film surface begins to drop, the moisture in the air can only condense into a thin water film on the surface of the film. When the water film thickens to a certain thickness, it flows along the surface of the film to the ground and penetrates into the ground. There is no dew on the lower surface of the drip-free film, which can overcome the disadvantage of a large number of water droplets attached to the inner side of the film, and the air humidity in the greenhouse is reduced. It avoids the reflection of dew on sunlight and the absorption of transpiration energy consumption, improves the light transmittance of agricultural film, and is conducive to the warming and dehumidification of greenhouses.

Drip irrigation under film

Drip irrigation under film combines the advantages of ground film covering and drip irrigation, and is a way to reduce the humidity in greenhouses. The method is to build high ridges on the ground, then place drip irrigation pipes in the center of the high ridges, and then cover the ground film. Using drip irrigation in a solar greenhouse can prevent soil compaction and ground temperature drop, and can effectively prevent a significant increase in air humidity due to watering. And it can reduce the number of irrigations, thereby reducing air humidity.Hanging reflective curtains

Hanging reflective curtains can improve the temperature of the ground. Since the relative humidity decreases with the increase of temperature, long-term hanging reflective curtains also have a certain dehumidification effect.

Application method

The application method should be changed from spraying to a combination of fumigation, misting, and powder spraying. It should be noted that the general fumigation time should not exceed 8 hours. Ventilate in time after fumigation to discharge harmful gases in the shed to avoid pesticide damage. In addition, when spraying powder, the powder particles will scatter from top to bottom, which will cause a lot of powder to adhere to the front of the leaves, affecting the photosynthetic effect. Therefore, it is not suitable for continuous use. It should be used at intervals with spraying, fumigation, etc.

Artificial dehumidification

If the humidity in the greenhouse is too high, you can sprinkle some straw, wheat straw, plant ash or fine dry soil in the room, or pile up hygroscopic materials such as quicklime in the vacant places in the shed. After a period of time, choose a sunny day to move the straw, wheat straw, quicklime, etc. outside the greenhouse for exposure and repeated use.

Among the above methods, methods such as fan wet curtains, drip irrigation under the film, and hanging reflective curtains can also be applied to the greenhouse control system of Juying Yunnong, and remote control of film rolls, fans and other equipment through mobile phones and computers for automatic execution. Based on wireless communication, Internet of Things, automatic control and other technologies, combined with greenhouse environment and existing intelligent facilities, connected with relevant equipment, real-time collection of greenhouse environmental parameters, and use of environmental data and crop information to guide users to perform correct cultivation management. Creating a suitable growth environment for crops is widely used in facilities agriculture, horticulture, animal husbandry and other fields to achieve automatic control of the environment and provide a scientific basis for intelligent management.

The greenhouse application greenhouse control system monitors soil moisture, composition, pH value, temperature, air humidity, air pressure, light intensity, carbon dioxide concentration and other parameters by setting sensors for various monitoring data. Data is collected and analyzed through the cloud platform, and stored, displayed and managed, and transmitted to the computer or mobile phone APP in the form of intuitive charts and curves. The manager sets management strategies based on the growth characteristics of the crops planted, and regulates the greenhouse environment, water and fertilizer irrigation, etc. At the same time, the alarm limit of each monitoring parameter is set. Once the monitoring value exceeds the limit, the alarm information will be pushed immediately.