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Abstract
Maize (Zea mays L., hyhrid Pioneer 3737) and wheat (Triticum aestivum L., cultivar Jantar) were grown hydroponically in nutrient solutions containing 10 mM nitrogen (N) as either the nitrate (NO3) anion or the ammonium (NH4) cation or in a 1:1 combination of both. Maize and wheat plants had different responses to the N sources. Maize growth and biomass accumulation were greatest with the equal combination of NO3 and NH4, while NO3 only was more favourable for wheat. The effects of the different N sources were detected on the 14th and 21st day for maize and wheat plants, respectively.