DEVELOPMENT AND EVALUATION OF A DSS FOR DRAINAGE MANAGEMENT IN SEMI-CLOSED HYDROPONIC SYSTEMS

N. Katsoulas, C. Kittas, T. Bartzanas, D. Savvas
The recycling of greenhouse effluents in soilless cultivation systems is environ-ment-friendly, since the waste of water and the disposal of nutrients to the environ-ment is drastically reduced or even eliminated. However, a long-term recycling of the effluents may result in accumulation of Na+ and Cl- in the recycled nutrient solution. The major aim of the present research was to test the performance of a Na+ mass balance model operating as part of a decision support system in a tomato crop grown in a closed-loop hydroponic system. Three treatments were compared: a completely open, a completely closed and a semi-closed hydroponic system during one experimental period lasting from October 2011 to January 2012. The fresh water used for the preparation of the nutrient solution contained 2 mM NaCl. During the total experimental period, the water uptake by the crop was relatively low, near to 130 L m--2, and thus, the concentration of Na+ in the closed system did not surpass the level of about 20 mM during the total experimental period. Comparison between measured and simulated Na+ values gave fair results. The system was efficient at minimizing the discharge of nutrient solution effluents in semi-closed hydroponic systems, thereby maximizing the water use efficiency.
Katsoulas, N., Kittas, C., Bartzanas, T. and Savvas, D. (2014). DEVELOPMENT AND EVALUATION OF A DSS FOR DRAINAGE MANAGEMENT IN SEMI-CLOSED HYDROPONIC SYSTEMS. Acta Hortic. 1034, 509-516
DOI: 10.17660/ActaHortic.2014.1034.64
https://doi.org/10.17660/ActaHortic.2014.1034.64
greenhouse, nutrient solution management, tomato, crop water consumption
English

Acta Horticulturae