INFLUENCE OF CROP SYSTEMS IN REDUCING OF DROUGHT EFFECT FOR SUNFLOWER PLANTS

Along with cereals, sunflower is species which has seen a significant expansion in plant structure on a farm (Brad, 1990). The economic advantages of this are important (Hera et al., 1989), and by creating new hybrids are always looking for the potential to be as their genetic filled in. A lot of the new hybrids have also a good resistance for drought seasons (Pârjol et al., 1971). In the paper there was a prospect of these new genetic possibilities in terms white luvicsoil of southern territory (Ionescu et al., 1983). Were experienced three times of sowing, three densities and three hybrids in recent years. The period studied included a very dry year (2012), a favorable year (2013) and a middle one (2014). Of all the factors, the greatest influence was a time of sowing, respectively were observed large losses of grain production by delaying sowing (Bîlteanu, 1993). The time in which most hybrids produced very well was 1 to 30 April. All hybrids sown in May produced significantly negative do to drought conditions (Vrânceanu, 1974). Density had only positive influence in medium climatic environment (Holliday, 1960; Robinson et al, 1980) and less in the very favorable one. In the background of very dry, high densities (50 and 70 plants.ha-1) grain yield formation disfavored. Investigated hybrids with high production potential, behaved rather differently, because their reaction for experiment factors was less obvious. Therefore, new hybrids Sandrina, Flornil and the latest F. 911 and F. 708 alongside Favorit is recommended for cultivation in southern white luvicsoil conditions