The best variety for polenta is hardy. This variety comes from ancient Romanian varieties such as Hăngănesc, Portocaliu, Moldovenesc oranj etc., and is more often known as Romanian corn, but its origin is also from America. The appearance of the hard grain gives the cornmeal superior qualities for human consumption. In order to obtain hybrids with superior food qualities and significant productivity in the experimental field, under monoculture conditions, the set of parents are studied and evaluated, from which the best inbred lines with optimal specific qualities are selected. With the participation of inbred lines as parental forms in systemic topcross and diallels (complete or incomplete), hybrid combinations were synthesized for experimentation. Based on the diallel crossing scheme, the combining ability of these hybrid combinations of corn with hard grain was evaluated, the most attention was drawn to grain production.