The hydroponic system is very often used for greenhouse vegetable production. The flood
irrigation on a bench or on the flood floors is applied in the production of ornamental plants
and vegetable transplants. This system is environmentally friendly, since fertigation is used in
a closed system using the recirculation of nutrient solution. The aim of this study, conducted
in 2010-2012, was to determine the effect of flood fertigation with different concentrations of
nutrient solution (EC: 1.0; 2.0; 3.0; 4.0 mS cm-1) on the yield and quality of the butterhead
lettuce cultivar Natalia grown in different substrates (coconut coir, peat and rockwool). The
experiment was conducted in the spring and autumn cycle. The highest marketable yield at
each concentration of the nutrient solution was achieved in the cultivation in rockwool, both
within the spring and autumn. The highest nitrate content in lettuce in terms of both cultivation
cycles was found in the lettuce grown in the nutrient solution concentration of EC 4 mS
cm-1, and the lowest one was achieved in the nutrient solution concentration of EC 1.0 mS cm -1.
Significantly less of nitrates was in lettuce grown in spring than in autumn. Higher levels of EC
significantly increased the content of P and K in lettuce leaves during in both growing cycles,
while the content of Ca and Mg was not significantly different. The applied substrates had a
significant impact on the content of K, P, Ca and Mg in leaves of lettuce. The best concentration
of the nutrient solution used for flood fertigation of greenhouse lettuce was EC 3.0 mS cm-1 for
the spring cultivation and EC 4.0 mS cm-1 for the fall crop.
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