Samenvatting

Hydroponic systems for lettuces production is a technique used more and more. However, this way of production is not free of environmental impact. The main substrate used today for the production is Rockwool substrate. However, Rockwool substrates are not biodegradable and generate pollution in their production cycle. The company Foamplantdesigned a substrate biodegradable and cheap to produce. The aim of the thesis was to determine the optimal growing conditions to exploit the new substrate. The main question was: What is the impact of different growing conditions on lettuce grown with Foamplant substrate? Thus, the main objective of this research was to describe the lettuces growth in different conditions to determine the more adequate for large-scaleproduction.