Traditional Culture Encyclopedia - Weather inquiry - How to cool down the greenhouse to 20 degrees in summer
How to cool down the greenhouse to 20 degrees in summer
How to cool down the greenhouse to 20 degrees in summer
How to cool down the greenhouse to 20 degrees in summer? The highest temperature in the greenhouse at noon in summer can reach about 40°C. Sunlight is helpful for the growth of plants, but too high a temperature will cause poor growth of vegetables. So how can the greenhouse be cooled down to 20°C in summer? How to cool down the greenhouse to 20 degrees in summer 1
1. Shading and cooling
Nowadays, we generally still use shading to cool down the greenhouse. Usually we will see some greenhouses Some black sunshade nets will be laid on the top, or they may be silver-grey, depending on the products you grow.
2. Wet curtain fan cooling
In fact, the principle of this is very simple. First, turn on the fan to draw out the air in the greenhouse, so that the air pressure in the greenhouse is reduced to In a negative pressure state, water is then pumped to the wet curtain wall. When the outside air is sucked into the greenhouse and wetted through the curtains, water vapor will be exchanged, and then the moisture will be converted to heat, allowing the water to evaporate. To cool down, this method is generally used in greenhouses.
3. Micro mist cooling
In fact, this is similar to the wet curtain fan cooling above. It atomizes the water supply and lets the atomized water disperse the air into the air. The temperature is absorbed, and then a fan is used to discharge the moist air to the outside of the greenhouse, thereby cooling down.
4. Natural ventilation and cooling
Natural ventilation is to remove heat, remove moisture, and adjust the composition of the air.
5. Cooling with air conditioners and other equipment
Everyone should be familiar with air conditioning cooling. Many friends will choose air conditioning for cooling. Everything has advantages and disadvantages. The cost of air conditioning cooling is too high. High, there are still relatively few farmers using this method to cool down.
In this hot summer, the temperature in the greenhouse is frighteningly high, sometimes reaching more than 40 degrees. If the temperature is not cooled down in time, it will be very detrimental to the growth of our crops. In fact, the above methods may not be suitable for all farmers. We must choose the best method to cool down the greenhouse based on our own conditions. We cannot choose blindly, otherwise we will end up losing more than we gain, and we will suffer losses. It’s more serious, let’s do this, how to cool down the greenhouse to 20 degrees in summer 2
1. Laying the sunshade net
When laying the black sunshade net, the black sunshade net needs to be pulled up and down every day. Do not cover the sunshade net all day long to avoid creating a weak light environment in the shed, which is not conducive to the growth of vegetables. Black sunshade nets should be used from around 10:30 am to 2:30 pm. In addition, the sunshade net should be propped up to leave a gap of about 20 centimeters away from the shed film. This will form a ventilation belt and have a better sunshade and cooling effect.
2. Splashing mud
Splashing mud is the only way to do this. It does not cost money, but it can also lower the temperature in the shed. However, the disadvantage of splashing mud is that it is easy to spray unevenly and is easily washed away after rain. If you spray it too thickly, it will be equivalent to covering the sunshade net all day long, which will easily cause low light hazards for a long time. In order to prevent the mud from being washed away by rain, some vegetable farmers can improve its resistance to washing by adding a certain amount of flour to the mud.
3. Ventilation and cooling
Ventilation and cooling of the greenhouse. When the temperature in the greenhouse is too high, timely ventilation through the opening is also a direct and effective management measure to reduce the temperature in the greenhouse.
However, when ventilating and cooling the greenhouse in the high temperature and bright light environment in summer, you must master the relevant ventilation skills. When the temperature in the shed is too high during the day, the ventilation of the roof and the lower part of the shed must be done. Gradually open all the vents
At the same time, pay attention to making good use of the vents on the ridge and side of the shed to create a state of air flow in the shed. However, it is important to note that the ventilation should be based on the ventilation openings from small to large, and the ventilation volume. Gradually cool down from less to more to prevent vegetables from dehydration and wilting due to sudden cold wind blowing.
In addition, when ventilating the openings of the greenhouse in summer, attention should be paid to adding a 40-mesh insect-proof net at the ventilation opening to prevent external aphids, thrips, etc. from invading the greenhouse through the air vent.
4. Watering to cool down
Generally speaking, frequent watering with small amounts of water can reduce the temperature, while watering with large amounts of water can promote root growth. If it is for cooling in summer, , it is recommended to adopt the method of frequent watering with small amounts of water and watering to increase humidity and drive away heat for cooling management. However, two points should be paid attention to. First, do not water suddenly at high temperatures at noon. Second, do not water with large amounts of water. Third, do not water with large amounts of water. It is better to water with small amounts of water frequently to cool down in summer. The best time to water is in early spring or in the evening.
5. Laying straw and rice straw
When encountering continuous high temperature and strong light weather in summer, you can first pour enough water in the greenhouse to moisten the shallow soil, and then put it in The rows of vegetables are covered with a layer of straw and rice straw. The straw and rice straw can not only absorb the heat in the soil during the day, but also reduce the evaporation loss of water in the soil, thereby achieving the effect of cooling and humidifying.
6. Spray cooling agent
Spraying cooling agent is currently the most trouble-free method.
Compared with greenhouses that are not sprayed, the average surface temperature can be reduced by more than 10°C when cooling agents are sprayed. The cooling agent is easy to use. When used, it should be diluted 5-10 times with water according to the growth temperature and light requirements of different vegetables. Choose different spraying methods according to the different requirements of vegetables for light.
7. Rooftop spray cooling
Rooftop spray cooling is a cooling measure adopted by many farmers, but it also depends on their own water source conditions. What needs to be noted here is whether the design of the sprinkler system is reasonable or not, which directly affects the water-saving effect. Generally speaking, the sprinkler system mainly includes: water source, pressurization (control) equipment, pipes and sprinklers.
The above is an introduction to the common methods for cooling vegetable greenhouses in summer. In order to ensure the yield and quality of vegetable planting in summer greenhouses, and to achieve high yields and excellent harvests of greenhouse vegetables, we must do a good job in summer greenhouses. High temperature protection management of indoor vegetables. How to cool down the greenhouse to 20 degrees in summer 3
1. Laying the sunshade net
It should be noted that the black sunshade net needs to be pulled and placed every day, and the sunshade net cannot be covered all day long. In addition, prop up the sunshade net and leave a gap of about 20 centimeters away from the shed film. This will form a ventilation belt and the sunshade and cooling effect will be better.
2. Splashing mud
Splashing mud can also lower the temperature in the shed. When the light is strong, splash more, and when the light is not strong, splash less. The disadvantage is that it has poor erosion resistance, and it will be washed away when it rains, and it has to be splashed again.
3. Spray cooling agent
Spraying cooling agent is currently the most trouble-free method. The average surface temperature of the greenhouse surface that is sprayed with cooling agent can be lowered by more than 10°C than that of a greenhouse without spraying.
Inside, it means installing some equipment in the shed or discharging water in the ditch to reduce the temperature inside the shed.
1. Fill the canals with water
When the temperature in the shed is high at noon, you can fill the canals with clean water to lower the temperature inside the shed. .
2. Laying straw in rows
Before spreading the straw, pour a small amount of water to thoroughly moisten the soil, and then spread the straw. This can not only reduce water evaporation, but also maintain soil moisture. It can also reduce heat storage and achieve better results. The lowering of the soil temperature can significantly reduce the night temperature, preventing the plants from growing too much, and at the same time, the root system will not be "covered".
3. Install a "simple air conditioner"
For sheds that have the conditions, you can install sprinkler equipment above the shed during the high temperature season in summer. When the temperature inside the shed is too high, Turn on the sprinkler equipment and spray clean water to reduce the temperature in the shed.
4. Strengthen greenhouse management
Ventilation - When rainy days come, vegetable farmers close the air vents. If they do not open the air vents in time after the rain, the high temperature and humidity in the shed will easily lead to Disease occurs. In addition, when venting the air in the arch shed, attention should be paid to venting the air from the ridge and both sides of the shed to achieve air flow. If the air is vented only from both sides, the effect will be poor and it will be difficult to cool down.
Watering can take away a lot of heat, but do not water during the high temperature period at noon, as it can easily explode the roots, causing damage to the capillary roots, and in severe cases, the plants will wilt and die. In summer, watering is generally done in the morning to ensure that the soil The humidity is suitable.
Thinning branches and leaves - leaving appropriate leaves to block the light, on the one hand to prevent sunburn, on the other hand to block the surface soil, reduce direct sunlight, reduce soil heat storage, and avoid excessive night temperatures.
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