ISHS Acta Horticulturae 421: II International Symposium On Sensors in Horticulture
MEASURING OF THE WATER CONTENT OF GREENHOUSE SOIL BY TDR, FD AND TENSIOMETERS |
| Authors: | C. Werkhoven, E.A. van Os |
| Keywords: | greenhouses, sensors, water use |
| Abstract:
To decrease the leaching of chemicals to ground water and surface water, different methods for measuring the water content of a soil were compared to test their suitability for use by greenhouse growers. On four different sites five Frequency-Domain probes (FD) and five Time-Domain Reflectance probes (TDR) were placed at five depth-levels with a 10 cm interval, all measuring the dielectric constant of the soil. On the same spots two tensiometers were placed at two depth. Measurement data were collected with a computer. Preliminary results will be presented about the reaction of the sensors on the different sites and depth-levels on watering the soil by sprinkler irrigation. Experiments are carried out in a cold greenhouse climate growing lettuce in winter and in a fairly hot climate growing cucumbers in summer. | |
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