Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Hristofor KIRCHEV, Rumyana GEORGIEVA, Vanya DELIBALTOVA
A field trial has been carried out in the Experimental field of the Agricultural University - Plovdiv. The experiment was arranged according to the split-plot method. The following varieties were studied: Lasko, Boomerang, Respect and Attila (split-plot), grown under two levels of nitrogen fertilization - 60 and 180 kg/ha nitrogen (main plot). The variety Lasko differed significantly as less productive. All Bulgarian varieties have approximately the same crude protein content in the grain. Compared to them, Lasko has a higher protein content. From the correlation analysis between grain yields and other indicators, it was found that all structural elements (plant height; the number of spikes per plant; length of spikes; the mass of grains per spike and mass of 1000 grains) are positively related to the grain yields. The crude protein content is negatively related to the grain yields from which it can be concluded that higher grain yields leads to a decrease in the crude protein content in it.
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