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.