Articles
DEVELOPMENT AND DEMONSTRATION OF AN OPTICAL OXYGEN SENSOR FOR HORTICULTURE
Article number
843_3
Pages
43 – 48
Language
English
Abstract
Using prototypes of oxygen sensors, we have carried out oxygen measurements in different cultivation systems for different crops.
These studies showed a strong correlation in the root zone between oxygen concentrations and water contents and also between oxygen concentrations and air content.
Low oxygen concentrations were monitored only when water contents were high (i.e., at least 60-70%). Therefore, the last year we have focused on the development of an oxygen sensor for application in soilless cultivation systems such as NFT (nutrient film technique), where water contents are high.
This paper will show the sensor system which has been developed and the evaluation of the sensor in the green house during growth of tomato.
Additionally, a new sensor system will be described for multi oxygen measurements in growing media, such as stone wool.
These studies showed a strong correlation in the root zone between oxygen concentrations and water contents and also between oxygen concentrations and air content.
Low oxygen concentrations were monitored only when water contents were high (i.e., at least 60-70%). Therefore, the last year we have focused on the development of an oxygen sensor for application in soilless cultivation systems such as NFT (nutrient film technique), where water contents are high.
This paper will show the sensor system which has been developed and the evaluation of the sensor in the green house during growth of tomato.
Additionally, a new sensor system will be described for multi oxygen measurements in growing media, such as stone wool.
Authors
W. Holtman, B. Oppedijk, A. Draaijer
Keywords
root environment, tomato, roses
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