Wireless sensors have proven to be a useful addition to regular measurements in the greenhouse. They can easily be moved within a compartment to give growers better insights into climate differences and to help track down any deviations.
Priva|Aranet wireless sensors can now be fully integrated with the control software of Priva Connext and Compact CC climate computers. This makes it possible to use multiple measurements in a single strategy and control based on minimum, maximum, or average readings.
Examples of applications for wireless sensors include measuring temperature and relative humidity, PAR, and moisture levels.
Temperature and Relative Humidity (RH)
Nowadays, growing crops means pushing control towards the boundaries of what is possible. When temperatures are low and humidity is relatively high, this can lead to condensation on the plant as the temperature drops close to the dew point. This is particularly common in plants growing near the side walls. With one sensor per compartment, you can only respond to that particular sensor. With additional wireless sensors, e.g., in every known cold spot, the computer can react to the lowest sensor reading and start the required action.
An inside PAR sensor for measuring photosynthetic active radiation will always encounter shade during the day due to greenhouse construction or installations. When you add more PAR sensors, it will not reduce the shade, but by using multiple sensors in a compartment it is possible to control your screen based on the highest measured value of the connected sensors (assuming that all PAR sensors are not in the shade at the same time). Another option is to compare the PAR measurement below and above the curtain.
Research Project Looks at Managing Pansy Height With Colored Shade Nets
With potted plants, the moisture content of the substrate in the pot can vary depending on where the plants are located, regardless of whether they are placed on a bench or on the floor. By measuring the moisture in different places, you are able to adjust the irrigation to the driest reading. This is also possible for determining the moisture content in bed crops and crops on different types of substrate.
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