Published in Scientific Papers. Series A. Agronomy, Vol. LIX
Written by Svetla KOSTADINOVA, Galia PANAYOTOVA, Lyubena KUZMANOVA
A pot experiment was carried out to determine dry mass and nitrogen accumulation until anthesis and at grain filling period, and dry mass translocation and utilization in grain filling of Bulgarian barley genotype Krami. The plants were grown on four levels of nitrogen nutrition – 0, 100, 200 and 300 mg N/kg soil. It was established that plants were synthesized 3-61% more dry biomass at pre-anthesis than at post-anthesis. Nitrogen fertilizing was diminished the relative amount of dry mass accumulated at pre- and post-anthesis and pre- to post-anthesis nitrogen uptake. The highest NHI/HI ratio was established at unfertilized plants – 1.67 and its values were slightly depended on the nitrogen levels. Pre- to post-anthesis N uptake was decreased with increasing N levels from 6.1 (at unfertilized plants) to 3.4 (at N300). Nitrogen fertilizing was decreased the relative part of nitrogen in the grain. Dry mass translocation efficiency ranged from 18.8% in unfertilised plants to 22.4% at applying N100. The mean nitrogen translocation efficiency was 60% and significant differences were obtained between unfertilized plants and those grown at N200.
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