Application of ISFETs in closed-loop systems for greenhouses. |
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Authors: | H H Gieling ThH Y" >van den Vlekkert |
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Affiliation: | IMAG-DLO, Wageningen, The Netherlands. |
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Abstract: | ![]() In horticulture, growing in artificial substrates such as rockwool is more and more considered to be a sound alternative to growing in soil. This development enables the opportunity to create closed-loop systems which lower the waste of raw materials and reduce pollution of the environment. Applying closed-loop systems needs precise knowledge of the composition of the recirculating nutrient solution. This paper presents basic principles of a measuring system, which can monitor continuously the concentration of nutrients in water. The system is based on ion-selective field effect transistors (ISFETs). By appropriate calibration, a high accuracy is achieved for pH and potassium measurements in the nutrient solution. An accuracy of better than 10% (mMol/l) has been achieved. |
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