УДК 633.853.494:57.042.2

E.O. Domaratsky

Abstract. Over the past 20 years, the level of rainfall in different regions of Ukraine has increased by 50-100 mm per year. The significant increase in temperature and the decrease in relative humidity during the growing season did not improve, but complicated the vegetation conditions of most crops. According to the forecasts of FAO UN experts, if this scenario does not change, already  by the  year 2030  about 650 million people will suffer from hunger. Significant impact, leading  to changes in climatic conditions is the human economic activity, including industrial production and agriculture.

The change in climatic conditions is an inevitable process, and therefore the task of agrarians is to quickly adapt to such transformations, as well as to find an instrument that will mitigate the negative impact of stress factors on agrocenoses.

The article presents the results of the influence of nitrogen mineral fertilizers and multifunctional feeding Helafit Combi^® in different periods of use (early spring feeding and leaf foliar  feeding) in winter rape sowing on the level of leaf vegetation.
It is proved that the coefficient of water consumption significantly decreased after fertilizing and the use of the growth regulating feedings. Neither fertilizers in the form of early spring feeding nor leaf treatment with Helafit Combi^® alone did not affect the growth and development processes, but their combination. If the treatment of plants with  N₆₀ reduces the water consumption by 3.6%, and  the treatment with Helafit Combi^® reduces this figure by only 2.7%, then the synergistic effect can be observed  in their complex action (water consumption decreases by 9.3%, and optionally from N₉₀ + Helafit Combi^® – by 14.5%).

After fertilization with the N₉₀ dose, the maximum level of crop yield was achieved, and in the complex with foliar feeding with  Helafit Combi^® there was achieved  increase in yields of up to 1,3 t/ha or 56%.

Key words: winter rape, water stress, soil moisture, Helaphite Combi®, yield.