Dry Mass and Nitrogen Translocation in Spring Barley

Agricultural University, BG-4000 Plovdiv, Bulgaria


KOSTADINOVA, S., 2003. Dry mass and nitrogen translocation in spring barley. Bulg. J. Agric. Sci., 9: 363–368

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 new and perspective for Bulgaria spring barley genotype No 14 from ICARDA. The plants were grown on four levels of nitrogen nutrition – 0, 150, 300 and 450 mg N/kg soil.
It was established that plants were synthesized 10–88 % more DM at pre-anthesis than at post-anthesis. Nitrogen fertilizing was diminished the relative amount of DM accumulated at pre– and post-anthesis and pre- to post-anthesis N uptake. Dry mass translocation (DMT) and efficiency (DMTE) was increased with N levels up to N300. Contribution of pre-anthesis dry mass to the grain yield (CAVG) was low and it was slightly depended on nitrogen fertilizing. The highest nitrogen translocation (334 mg N/pot) was established at level N300. Genotype No14 was characterized with high NTE (mean value 60 %). The highest NHI/GHI ratio was established at unfertilized plants (1.70). Nitrogen fertilizing was decreased the relative part of nitrogen in the grain.

Key words: accumulation; dry mass; nitrogen; translocation efficiency; spring barley