THE INFLUENCE OF DIRECT CURRENT DISCHARGES ON VEGETAL ORGANISMS EXPOSED DURING EARLY ONTOGENETIC STAGES
Pages 137-140
Iuliana Motrescu, C. Astefanoaei, C. Nadejde, D. E. Creanga, G. Stoian
Abstract
The impact of direct current pulses on vegetation was studied in the frame of laboratory experiment, based on sunflower response to electromagnetic stress. The direct current device delivers short pulses (40 ms) of relative high amplitude (15 kV) between a point electrode and a plate one. Plant seedlings during their early ontogenetic stages were exposed to various numbers of electric pulses for five consecutive days. The influence on the photosynthesis was studied by measuring the fresh substance mass, the dry substance and the water accumulation at the end of the experiment. The chlorophyll ratio was assayed, since the ratio chla/chlb may be taken as an indirect indicator of photosynthesis efficiency.