Influence of different fertilization systems on sunflower seed yield and oil content in conditions of insufficient moistening of Krasnodar region

The results of researches on influence of different fertilization systems on sunflower seed yield and oil accumulation at multiple-factor stationary trial which was conducted in northern zone of Krasnodar region in conditions of insufficient moistening during 30 years, are sated in the article. For maintenance of general soil fertility, optimization of nutrient regime of plough-layer and stabilization of sunflower seed production in this zone, it is necessary to keep scientific based crop rotations, apply mineral fertilizers at a rate N45Р53К32 per a ha in average, including under sunflower - N20Р30 and N40Р60. This rate provides oil seed yield at a level 2.80-3.35 t ha-1. The further increase of mineral fertilizer dozes under sunflower is not reasonable in conditions of this zone.