Beda (Medicago sativa L.) pichan hosili va oqsil yig‘imiga «Immuno aktiv» preparatini qo‘llash muddati va me’yorining ta’siri

Abstract

The study evaluated whether a biostimulant can raise hay yield and protein output of alfalfa on light sierozem soils of the Fergana region, Uzbekistan. In a two-factor field experiment (2024–2026), "Immuno Aktiv" was applied to alfalfa cv. 'Tashkent-1' at four phenological stages (regrowth onset, stem elongation, bud formation, flowering) at 30, 40 and 50 g ha⁻¹. All 12 treatments significantly exceeded the control in hay yield and protein output. The best result was obtained with application at regrowth onset at 50 g ha⁻¹: three-year mean hay yield increased from 23.04 to 25.76 t ha⁻¹ (+11.8%), crude protein content from 16.3 to 18.3%, and protein output from 3755 to 4722 kg ha⁻¹ (+25.8%). About half of the gain in protein output came from higher yield and half from higher protein content. The results support applying the product at early growth stages to increase the protein productivity of alfalfa.