The paper explores a concept of irrigation control, where the supply of nutrient solution is controlled without the use of predictive uptake models but rather by the use of a direct feedback of a drain flow measurement. This concept proves to be a viable approach. Results are presented, showing the compensation of changes in water up-take due to variations in global radiation, with a very tight control of the drain flow, keeping it constant over long periods of time. A tipping-bucket type flow sensor and its use in controlled water supply to a to-mato crop is described. A calibration procedure for the tipping-bucket instrument is presented.
|Title of host publication||Proceedings of the Third International Symposium on Sensors in Horticulture, ISHS - Sensors in Horticulture, Tiberias (IL), August 1997|
|Publication status||Published - 2001|
Gieling, T. H., Janssen, H. J. J., de Vries, H. C., & Loef, P. (2001). Feedback control of water supply in an NFT growing system. In Proceedings of the Third International Symposium on Sensors in Horticulture, ISHS - Sensors in Horticulture, Tiberias (IL), August 1997 (pp. 19-30). (Acta Horticulturae; No. 562). https://edepot.wur.nl/25897