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In the period 2018-2020, an experiment was carried out with tomato variety "Nikolina F1" on leached cinnamon forest soil. The influence of increasing irrigation and fertilizer rates delivered by fertigation on tomato yields was studied. The experiment contained 8 variants at two irrigation rates (1-4 variants - 100% MMC; 5-8 variants - 50% MMC) and increasing levels of fertigation (T1 and T5 - without fertilization; T2 and T6 - N15P8K15; T3 and T7 - N20P12K20; T4 and T8 - N25P16K25). The results show that the formed yields of tomatoes during the studied years are the result of the influence of climatic factors, applied fertilization and irrigation rates. The average yields of tomatoes from the three experimental years range between 2864.0 and 5601.3 kg.da-1 with an average yield of 4363.96 kg.da-1. With average yields for the three experimental years of 2145.3 kg.da-1 for 2018; 5513.63 kg.da-1 for 2019 and 5430.5 kg.da-1 for 2020, as the plants of variant T3 fertilizes with N20P12K20 and full irrigation rate - 100% MMC realized the highest yields, in 2018 with 23.1 %, in 2019 with 37.2% and in 2020 with 21.6% higher than the average yields for the respective years. The three-factor statistical analysis of the average yield data shows that the influence of the year is the strongest - 67.77% of the formed yields are dependent on the experimental year. The degree of influence of the applied fertigation is 19.5%, of the irrigation rate - 1.3%, of fertigation and the year is 7.48%, and the joint influence of fertilization and the irrigation rate is less than 1%. [ABSTRACT FROM AUTHOR]

During the period 2018-2020, on leached Cinnamon forest soil at outdoor irrigation conditions, studies were conducted with determinant tomato variety Nikolina F1 -- medium early production. The influence of 50 and 100% irrigation rates and increasing fertilization by fertigation (N15P8K15; N20P12K20 и N25P16K25) on the quality of the formed production has been established. The results of the three-year study show higher quality indicators in tomatoes with reduced irrigation compared to 100% irrigation rate - 6.0% higher dry matter content, 12.3% more total sugars, 16.99% higher sugar-acid number, as well as an acid content reduced by 8.3%. In terms of dry matter, total sugars and sugar-acid number, the variant fertilized with N20P12K20 is optimal for both irrigation rates. In both irrigation rates, there is a trend for the acid content in the fruits to increase with the fertilizer rate, while in the case of ascorbic acid, there are no pronounced trends over the years. The regression dependences represented by polynomial equations between the quality indicators for tomatoes and the applied fertilization depending on the irrigation rate show high values of the coefficients of determination (R2 between 0.58 and 0.99), except for the dry matter and total sugars at full irrigation rate in 2020 [ABSTRACT FROM AUTHOR]