EFFECTIVE APPLICATION OF THE COMPLEX MINERAL FERTILIZER LYUBOFOS IN CROP VARIETIES OF ALFAALFA ZAYKEVYCH IN CONDITIONS OF THE CENTRAL FOREST STEPP OF UKRAINE

The article presents the results of research on the use of alfalfa cultivar Zaykevych mineral fertilizer Lyubofos NPK (Ca, S) 4-12-12-(5-20) at different times and application rates. The purpose of the research. Recently in Ukraine little attention has been paid to fodder plants and alfalfa blue. In connection with the changing requirements for the fertilizer system and the emergence of new complex fertilizers in Ukraine, it was decided to investigate the impact of terms and rates scientific production center BNAU of application of mineral fertilizer Lyubofos on the productivity of green mass of alfalfa variety Zaykevych obliquely during the growing season. Research methods: field, laboratory, comparative, analysis, generalization, mathematical and statistical. Results. Comparing the data of average daily temperatures and precipitation, we can conclude that the duration of the growing season between mowings of alfalfa was greatly influenced by air temperature. The use of Lyubofos fertilizer has a positive effect on the yield of alfalfa green mass. As the doses of fertilizer increase, so does the yield. With the application of 200 kg/ha in the physical mass of Lyubofos, the increase compared to the control without fertilizers is 30 %, and the application of 400 kg/ha increases the yield by 67 %. It was found that early spring feeding of alfalfa plants Lyubofosis more effective than autumn. The best yield result is 119.4 t/ha or +225 % to control, for application in autumn and spring at 400 kg/ha f. m. Lyubofos, N32P96K96(Ca40, S160). Analysis of yield between mowing’s shows that alfalfa provides the highest yield of green mass in the first (36.5 %) and second (39.8 %) mowing’s and significantly lower in the third (23.7 %). Conclusions: According to three-year studies of alfalfa cultivation in the Forest-Steppe of Ukraine, the best option for one-time use of Lyubofos mineral fertilizer is its spring application at the rate of 400 kg / ha, or N16P48K48 (Ca20, S80). This ensured a yield of 88.8 t / ha over the years of use. The survival of alfalfa plants during the study period increased by 47.1 % compared to the control. With separate use of Lyubofos fertilizer, the best option was to apply 400 kg / ha in autumn and spring, which amounted to N32P96K96(Ca40, S160). The survival of plants under control in this variant is the highest 47.2 %, and the yield in the amount for 2020-2021 was 119.4 t/ha. Keywords: alfalfa, mineral fertilizer, norms and terms of application, yield of green mass.