O‘TLOQI-ALLUVIAL TUPROQLARIDA G‘OZA EKINING ILDIZ, ANG‘IZ QOLDIQLARI VA O‘G‘ITLARNING TUPROQ ORGANIK MODDASI BALANSIGA TA’SIRI

Abstract

This article examines the effect of cotton root and stubble residues, as well as different fertilizers, on soil organic matter balance in irrigated meadowalluvial soils of the Tashkent region. The study compared unfertilized control, vermicompost, biological mineral fertilizer, and decomposed manure treatments. The amount of organic residues entering the soil and their contribution to humus formation were determined. Humus accumulation was analyzed in the 0–30 and 30– 50 cm soil layers. Results showed that under unfertilized conditions, the humus balance was nearly zero or negative. Application of organic and biological fertilizers significantly increased humus formation. The highest positive balance was observed with the application of 40 t/ha of decomposed manure. Organic fertilizers enhanced microbial activity and stabilized soil organic matter. The findings highlight the importance of organic inputs for maintaining soil fertility. The results provide a scientific basis for sustainable agricultural practices.