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More homogeneous greenhouse climate with wireless sensors

With the new AgriSensys sensor system cold spots in the greenhouse are easier to detect. Specific measures can be taken to eliminate climate differences. This leads to energy savings and healthier crops. This is reported by Glasbouwtechniek Magazine(Greenhouse horticulturetechnology Magazine).

AgriSensys was developed by Wireless Value from Emmen. The wireless system was developed in concert with Wageningen University Greenhouse Horticulture. The system consists of a set of wireless sensors and a base station. This allows for accurate depictions of local climate differences in the greenhouse. Depending on the positioning of the sensors, horizontal or vertical climate differences in the greenhouse can be detected. The sensors continuously register the temperature and the humidity. The data is automatically sent to an online platform. Via the internet, images of the temperature and humidity differences or the moisture deficit in the greenhouse can be requested. Various graphs can also be made and it is possible to take corrective measures based on these insights.

Practice

Gerbera grower Kees Mans installed AgriSensys sensors in the greenhouse in March. Mans has built a new greenhouse according to the principle of the New Cultivation. Boxes for external air (AHUs) have been installed, there are hoses under the crop and there is a double screen. The sensors in the new greenhouse are installed in the context of the ‘Klimaat monitoring (Climate monitoring)’ project from the Kas als Energiebron (Greenhouse as an Energy Source) programme. He says: “the New Cultivation is a learning process. We are working hard gaining experience with the new system. Setting up all installations requires a lot of time and this spring we discovered some very surprising when we installed a set of sensors.”

Mainly the homogeneity of the greenhouse climate was disappointing. “We have four departments with a measuring box in the middle of each department. It appears that these measuring boxes provide insufficient information. With the sensors it became clear that there are still cold spots at the side of the facade. By working differently with the screens, we largely eliminated this inequality without the need for additional heating. Fewer cold spots mean that overall there is better quality, less crown rot and less Botrytis.”