Effectiveness of Applied Nitrogen Rates in Barley
Veselin Sevov* and Nikolay Minev
ABSTRACT
The effectiveness of nitrogen rates 0, 40, 80 and 120 kg N.ha-1 on the productivity and the indexes Partial factor productivity and Agronomic efficiency of malting barley was studied in the experimental field of Agricultural University of Plovdiv, Bulgaria in the period of 2023-2025. The total nitrogen as NH4NO3 was applied as top dressing. The experimental design was a randomized, complete block design with four replications and a size of experimental plots of 18 m2 after a sunflower as a predecessor. A high effect of low N40 fertilization of barley variety Emon has been proven in terms of PFP-N and AE-N indicators. The productivity per unit of soil and fertilizer nitrogen (PFP-N) for grain, for grain + straw and for grain protein exceeds 3.17, 2.93 and 2.93 times, respectively, those at the N120 rate in 2024 and 2.7, 2.5 and 2.2 times, respectively, in 2025.
