Hovenko R. Hovenko R. V. The productivity of corn according to fertilization in LeftBank Forest-Steppe of Ukraine

The thesis is devoted to the solution of an important scientific task of improving the technology of growing corn in order to realize the biological productivity potential of hybrids in the conditions of the Left Bank Forest Steppe of Ukraine. In the dissertation, the elements of the technology of growing corn hybrids for the conditions of the Left-Bank Forest-Steppe of Ukraine are substantiated and established by experimental determination of the effective type of nitrogen fertilizers and the frequency of foliar treatments and the phenological phase of the application of Humilin Stimul fertilizer on corn crops. The complex influence of weather conditions, characteristics of hybrids and fertilizers on the photosynthetic activity of crops and the yield of corn was determined. The dependence of the elements of the crop structure and grain quality indicators on the studied factors was established. Recommendations have been developed for the conditions of the Left Bank Forest Steppe of Ukraine for the cultivation of mid-ripening corn hybrids EC Concord and EC Asteroid. The scientifically proven and practically proven effectiveness of one-time foliar top dressing of crops with Humilin Stimul fertilizer at the rate of 3 l/ha in the phenological phase of 5–7 leaves against the background of KAS 32 fertilizer, prolonged action. Studies have shown that the duration of interphase periods of corn hybrids depended on the use of nitrogen fertilizers and differed depending on their species. It was found that it was the largest when KAS 32 fertilizer was applied. At the same time, it was established that the duration of the growing season also increased by 3–7 days on average with foliar fertilizing with Humilin Stimul fertilizer. In the course of the conducted research, the dependence of the height of the hybrid plants and the height of the attachment of the corn cob on the type of nitrogen fertilizers was revealed and confirmed. Observation of the height of the attachment of the lower cob proves a directly proportional dependence on the type of nitrogen fertilizers and the increase in the linear dimensions of the plants. The influence of the elements of corn cultivation technology on the content of photosynthetic pigments in the leaves was revealed. It has been scientifically proven and proven that the effectiveness of nitrogen fertilizer application depended on the type of fertilizer, the phenological phase of corn and the frequency of foliar treatments of crops. Research has revealed a clear dependence of the accumulation of protein content on the use of various forms of nitrogen fertilizers and foliar fertilizing of crops. Calculations of the economic and energy efficiency of application of fertilization of crops with Humilin Stimul fertilizer made it possible to establish effective combinations of application of forms of fertilizers and fertilization of crops Humilin Stimul.