B. Dyulgerova*, N. Dyulgerov Agricultural Academy, Institute of Agriculture – Karnobat, 8400 Karnobat, Bulgaria (Manuscript received 20 November 2023; accepted for publication 15 February 2024) Abstract. This study aimed to assess genetic variability for grain yield and yield-re

V. Valkova*, N. Petrovska Maize Research Institute, 5835 Knezha, Bulgaria (Manuscript received 6 June 2016; accepted for publication 18 August 2016) Abstract. The study shows the results of a preliminary evaluation of the combining ability for grain yield of 17 mutant maize lines. For

M. Ilchovska Abstract. For the purposes of preliminary evaluation of the combining ability for grain yield of 12 mutant maize lines a top cross method for early testing and the mathematical model of Savchenko(1993) for analysis of the general combining ability and specific combining a