Folia Horticulturae

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The effect of fertilization with different forms of nitrogen on greenhouse lettuce quality and its changes during storage. II. Nitrate and nitrite content

Stanisław Rożek*, Włodzimierz Sady**, Maria Leja*, Jan Myczkowski*

**Department of Plant Physiology
**Department of Soil Cultivation and Fertilization
**Faculty of Horticulture, Agricultural University
**29 Listopada 54, 31-425 Kraków, Poland

The results are given of two years' investigations concerning the effect of nitrate (N-NO3), ammonium (N-NH4), and urea (N-NH2) nitrogen fertilizers applied using the film nutrient technique (NFT) on nitrate and nitrite reductase activity, nitrate and nitrite level, and also free amino acid content in greenhouse lettuce harvested and stored at low (5°C) and high (20°C) temperature. Among the determined compounds nitrite reductase and nitrates seemed to be the most stable during the storage period.

Rożek S., Sady W., Leja M., Myczkowski J., 1994. The effect of fertilization with different forms of nitrogen on greenhouse lettuce quality and its changes during storage. II. Nitrate and nitrite content. Folia Horticulturae VI/1: 53-62.