The effectiveness of humic fertilizers when cultivation corn for green mass in Western Kazakhstan under irrigated conditions

In 2021–2023 fertilizers based on humic acids were studied in irrigated dark chestnut soils of the Bayterek region in the Western Kazakhstan region. The research subjects included the hybrid corn F1 Lider 240, grown for green mass and humic fertilizers produced by Life Force Group, LLC (Saratov, Russia): Reasil® micro Amino Zn (1.0 L/ha), Reasil® micro Hydro Mix (1.0 L/ha), and Reasil® Forte Carb-N-Humic (2.0 L/ha). They were applied with nitrogen fertilizing N40. All studied types of fertilizers had a beneficial effort on the growth and development of corn: plant height, dry aboveground biomass gain, leaf area, and leaf weight. The maximum yield of green corn mass (69.5 t/ha on average over three years) was obtained with the treatment N40 (before the first irrigation) + 1.0 L/ha Reasil® micro Amino Zn (in the 7-9 leaf stage) + Reasil® Forte Carb-N-Humic (2.0 L/ha) in the 11-13 leaf stage. A noticeable increase in the removal of nitrogen, phosphorus, and potassium from the soil after the application of humic acids-based fertilizers was observed.