ECONOMIC ANALYSIS OF WINTER BARLEY PRODUCTION FOR DIFFERENT SOIL TILLAGE AND NITROGEN FERTILIZATION SYSTEMS

The winter barley crop production is not adequately researched regarding soil tillage systems, especially in crop rotation with the soybean, both crops gaining importance as food for the animals. The research at experimental site Boksic (Croatia), during the years 2005 and 2006, showed no difference in yields from conventional tillage, based on mouldboard ploughing, and reduced tillage, based on diskharrowing, in each of six nitrogen fertilization levels (0, 30, 60, 90, 120 and 150 kg N ha-1). Regarding N fertilization, yield increase was not significantly higher after applied 90 kg N ha-1. The diskharrowing with 90 kg N ha-1 showed to be the most profitable tillage system.