Folia Horticulturae

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The effect of fertilization with nitrate and urea forms of nitrogen on quality and storage ability of lettuce grown in a foil tunnel. II. Nitrate and nitrite content, activity of nitrate and nitrite reductase

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 presented of a two-year experiment concerning the effect of nitrate (N-NO3) and urea (N-NH2) nitrogen applied in fertilization of lettuce grown in a foil tunnel on nitrate and nitrite reductase activity and content of nitrate and nitrite in lettuce harvested and stored at low (5°C) and high (20°C) temperature. Of the two investigated cultivars Prado was characterized by a higher nitrate content as well as higher nitrate and nitrite reductase activity than Oresto.

During the storage of lettuce heads a considerable decrease in nitrate reductase activity and a significant increase in nitrite content was observed.

Rożek S., Sady W., Leja M., Myczkowski J., 1995. The effect of fertilization with nitrate and urea forms of nitrogen on quality and storage ability of lettuce grown in a foil tunnel. II. Nitrate and nitrite content, activity of nitrate and nitrite reductase. Folia Horticulturae 7/1: 107-116.