Determination of the degree of using potential efficiency of the photosynthetic process in tomato production
Jerzy Mydlarz*, Włodzimierz Starzecki*, Andrzej Libik**
**Institute of Plant Physiology
**Polish Academy of Sciences
**Sławkowska 17, 31-016 Kraków, Poland
**Department of Vegetable Crops
**Faculty of Horticulture, Agricultural University
**29 Listopada 54, 31-425 Kraków, Poland
The actual photosynthetic activity was assessed three times during the
vegetation period of plants of the tomato cultivar Sidonia grown in the
greenhouse. The conditions of irradiation of a particular leaf, its
position on the plant, and its spacial orientation were taken into
account. The potential intensity of photosynthesis was determined by
exposing the leaf to direct solar radiation, which secured the saturation
of photosynthesis with radial energy.
Apart from the degree of shading, the main factors deciding the actual photosynthetic level in
production are: the inactivation of the photosynthetic apparatus,
increasing with the age of the leaf, and the decreasing potential
efficiency of the photosynthetic process of young leaves, successively set
on constantly ageing plants. The actual photosynthetic intensity of shaded
leaves in a stand reaches 50-70% of its potential efficiency. The
improvement of irradiation conditions by defoliation may result in a
fuller use of the potential efficiency of the photosynthetic apparatus.
Mydlarz J., Starzecki W., Libik A., 1993. Determination of the degree of using
potential efficiency of the photosynthesis process in tomato production.
Folia Horticulturae V/1: 109-118.