Economic efficiency of nitrogen feedings for winter wheat cultivation in northen Steppe of Ukraine

In the northern Steppe of Ukraine at the State Institution Institute of Grain Crops of NAAS for 2016–2019, we studied the influence of plant feeding with different types of nitrogen fertilizers (ammonium nitrate, urea ammonium nitrate mixture (UAN-32), ammonium sulfate) on the economic efficiency of winter wheat cultivation after black fallow and after sunflower. It was established that the lowest cost of one grain ton, the highest net income per hectare and profitability level were in the trial variant where after both predecessors against the background of pre-sowing fertilization (N30P60K30 – after black fallow and N60P60K60 – after sunflower) feeding crops with nitrogen fertilizers was locally applied on two dates: N30 on freeze-thawed soil + N30 at the end of plant tillering stage. The above indicators among the studied varieties of winter wheat, such as Kokhanka (valuable variety), Nyva odeska and Uzhynok (strong varieties), were the best in the Nyva odeska variety, and they achieved at cultivation after black fallow depending on the type of nitrogen fertilizers 2055– 2222 UAH, 28470–30089 UAH per hectare and 200.2–224.6 %, respectively. When growing the same variety after sunflower with nitrogen feedings on two dates, the indicators ranged depending on the fertilizer type: the cost of one grain ton – 2813–2953 UAH, net income – 16802–17821 UAH/ha and profitability level – 125.9–137.1 %. The Uzhynok winter wheat variety after the non-fallow predecessor had the lowest economic indicators and produced lower yield compared to Nyva odeska and Kohanka varieties. It was found that Urea Ammonium Nitrate mixture (UAN-32) fertilizer for nitrogen feedings provided the higher economic cultivation efficiency of all winter wheat varieties, and the more expensive ammonium sulfate had the lower efficiency after both predecessors. Keywords: winter wheat, variety, predecessor, mineral fertilizers, nitrogen feedings, yield, economic efficiency.