Abstract
Environmental and economic concerns require the recycling of plant nutrient solutions used in soilless cultures using closed hydroponics systems. The composition of the solution varies with time depending directly on crop physiology and indirectly on climate conditions. Fertigation systems do not control the composition of the solution per se, but its pH and EC. This is imposed by the lack of viable low cost sensors measuring the elementary composition of the solution. In order to overcome this problem, a dynamic model for the prediction of the composition of the nutrient solution from climate variables was developed. This model is to be used for analysis and control purposes.In this paper, the structure of the model as well as the first results using it are presented.
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