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Abstract
Cucumber plants were hydroponically grown in a greenhouse with four N03-/NH4+ ratios (100/0, 80/20, 60/40 and 30/70), in order to study their tolerance to NH/ supply. Plants grown in 60/40 N03- /NH/ solution displayed higher weight than N03- treated plants. By contrast, plants grown with N03-/NH4+ ratios of 80/20 and 30/70 showed lower growth than plants fed with N03- as the sole source of N. As the proportion of NH4+ in the nutrient solution was increased Ca, Mg, Mn and B in the leaf and Ca and Mg in the root decreased, whereas P, K, and Zn concentrations in the leaf and Fe, B and Zn levels in the root increased. Finally, NH/ supplied in low and high concentrations was harmful to cucumber plants cv. Hyclos development, whereas it is really efficient when N03- and NH4+ are supplied in about equivalent amounts (60/40).
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