Temperature and Humidity Control in Greenhouses
Temperature and Humidity Control in Greenhouses is very important for the efficiency of greenhouses and the health of plants. Correct temperature and humidity levels provide optimal growth conditions for plants and reduce the risk of disease. Temperature control in greenhouses is usually provided by ventilation systems, heaters and cooling systems. Humidity control is done using humidifiers and dehumidifiers. Automatic systems in particular constantly monitor temperature and humidity through sensors and make the necessary adjustments. In this way, the microclimate needed by plants is created and a healthier and more efficient production environment is provided. As Esular, we offer advanced systems for the most suitable temperature and humidity control in your greenhouses. Our high-precision temperature and humidity sensors instantly monitor the climate conditions of your greenhouse and maintain ideal levels with our automatic control systems.

What is the Effect of Temperature and Humidity on Plants?
Humidity:
- Photosynthesis and Transpiration: Humidity is critical to the photosynthesis and transpiration processes of plants. Adequate humidity allows stomata to remain open, facilitating the uptake of carbon dioxide and the expulsion of water vapor.
- Cell Turgor: The turgor pressure of plant cells is maintained with adequate humidity. This pressure keeps plants upright and structurally intact.
- Nutrient Uptake: High humidity levels increase the uptake of nutrients from plant roots. This supports plant health and growth.
- Diseases and Pests: High humidity can promote the spread of fungal and bacterial diseases. On the other hand, low humidity levels can prevent the spread of some pests.
Temperature:
- Photosynthesis and Respiration: Temperature directly affects the photosynthesis and respiration rates of plants. While photosynthesis rates increase in the optimal temperature range, extreme temperatures can cause plants to become stressed and photosynthetic.
- Growth and Development: Each plant has an optimal growth temperature range. Temperatures outside this range can slow or stop plant growth.
- Flowering and Fruiting: Temperature directly affects the flowering and fruiting processes of plants. A certain temperature range ensures that these processes occur healthily.
- Enzyme Activity: Most enzymes in plant metabolism show maximum activity within a certain temperature range. Extreme temperatures can negatively affect plant metabolism by disrupting the structure of enzymes.
Humidity and temperature are critical environmental factors that have a direct effect on the health and productivity of plants. Maintaining optimum humidity and temperature levels is essential for plants to photosynthesize, grow, bloom and remain healthy. Therefore, humidity and temperature control in greenhouses is vital for productive and healthy plant cultivation.
The Role of Air Conditioning Systems in Humidity Control
Air conditioning systems play a critical role in maintaining greenhouse efficiency and plant health. These systems control humidity levels to keep plants in optimal growing conditions. Integrated systems continuously monitor environmental conditions with temperature and humidity sensors. When the sensors detect that the temperature or humidity has risen to unusual levels, they automatically activate the ventilation system. This is achieved by opening the windows and doors inside the greenhouse and allowing excess moisture to escape. Ventilation systems also play an important role in temperature control. For example, when the temperature gets too high, the ventilation fans inside the greenhouse are activated and provide cool airflow, preventing plants from overheating. This integrated system creates a stable microclimate that is essential for healthy plant growth. Greenhouse owners can optimize plant health while saving energy with these smart systems. Contact us for more information and solutions that fit your needs.


What is a Humidity Temperature Sensor?
The wireless battery-powered humidity temperature sensor is a device designed to determine the humidity level and temperature of the environment. It is usually used in plant growing environments such as greenhouses. This sensor works with a 3.6V lithium-ion battery and does not require an external power source, making it easy to install and use. The sensor has a single input and measures the humidity and temperature levels of the environment at certain intervals through this input. The measured data is transferred to a server using wireless communication technology. In this way, users can remotely access the current status of the environment and intervene when necessary. The data provided by the sensor facilitates the management of the area where it is applied. For example, it is possible to monitor the humidity and temperature levels and take measures such as irrigation or ventilation when necessary to ensure optimum growth conditions for plants. This makes the plant growing process more efficient and increases product quality.

What Should the Humidity and Temperature Values Inside the Greenhouse Be?
Optimum Temperature and Humidity Conditions in Greenhouses
1. Greenhouse Temperature Conditions:
The day and night temperature ranges according to plant type are as follows:
Plant Type | Germination Period (°C) | Development Period (°C) | Harvest Period (°C) |
---|---|---|---|
Cucumber | 17-18 | 17-18 | 18-20 |
Melon | 17-18 | 17-18 | 18-20 |
Watermelon | 17-18 | 17-18 | 18-20 |
Tomatoes | 10-12 | 10-13 | 15-17 |
Pepper | 10-12 | 10-13 | 15-17 |
Bean | 10-12 | 10-13 | 15-17 |
Lettuce | 8-9 | 8-12 | – |
- There should be a difference of 5-8°C between day and night temperatures inside the greenhouse.
- The temperature should not go below 15°C on cold days and above 30°C on sunny days.
- The temperature inside the greenhouse is controlled with heaters and sunlight.
2. Root Zone Temperature:
- Root zone temperature is critical for plant growth, shoot formation and flowering.
- Soil temperature affects the development of the plant root system. Yield and quality may decrease when outside of optimum values.
3. Relative Humidity Conditions Inside the Greenhouse:
Recommended relative humidity values according to plant type:
Plant Type | Optimum Relative Humidity (%) |
---|---|
Cucumber | 85-95 |
Melon | 65-75 |
Watermelon | 65-75 |
Tomatoes | 50-60 |
Pepper | 50-60 |
Bean | 50-60 |
Lettuce | 70-80 |
Celery | 70-80 |
Spinach | 70-80 |
Parsley | 70-80 |
Cabbage | 65-75 |
- Optimum relative humidity values may vary depending on the type of plant grown, greenhouse temperature and light intensity.
- High relative humidity can create a suitable environment for pathogenic organisms; low relative humidity can cause water loss and wilting in plants.
4. Soil Moisture Conditions:
- It is important to have water above the wilting point, close to field capacity.
Mulching (plastic spreading) on the soil and regular hoeing ensure soil moisture is maintained and evaporation is reduced. - These conditions are important to support healthy plant development and optimum yield. Greenhouse climate management should be arranged to meet the needs of plant species.