PSHS main page    Folia Horticulturae

Current issue content   Search      

Effects of changes in photosynthetic irradiance of greenhouse tomatoes on nitrogen uptake, distribution, and nitrogen compound metabolism

Mieczysław Paradowski, Katarzyna Kamińska, Władysław Gosiewski

Department of Vegetable Crops
Faculty of Horticulture, Warsaw Agricultural University
Nowoursynowska 166, 02-766 Warszawa, Poland

Investigations were performed on greenhouse tomatoes of the Vivia cultivar grown under greenhouse hydroponic conditions. 74 days after planting the seeds three experimental variants were introduced. Some of the plants were left under the same conditions, while the rest were transferred to chambers with a higher intensity of irradiance. Within this group plants were isolated which received an increased concentration of nitrogen components in the medium. In order to observe the effects of these conditions on the uptake and ditribution of nitrogen and the metabolism of nitrogen compounds in the plants, part of the nitrogen was added to the medium in the form of 15N.

An increase in irradiance caused increased nitrogen uptake and the rate of its metabolism. An increase of mineral components caused nitrogen uptake and led to nitrate accumulation in the plants.

Paradowski M., Kamińska K., Gosiewski W., 1995. Effects of changes in photosynthetic irradiance of greenhouse tomatoes on nitrogen uptake, distribution, and nitrogen compound metabolism. Folia Horticulturae 7/1: 15-25.