CHANGING THE CONTENT OF HUMUS AND NUTRIENTS AVAILABLE TO PLANT SOILS DURING TWO-YEAR CULTIVATION OF COTTON BY APPLYING NEW FORMS OF ORGANIC AND ORGANO-MINERAL FERTILIZERS ON IRRIGATED TYPICAL SERIOZEME

The paper presents the results of studies of the effect on the dynamics of the content of humus and mobile nutrients in the soil when introducing new forms of organic and organomineral fertilizers based on humic substances under cotton, aimed at mobilizing (activating) soil phosphates and increasing the efficiency of applied phosphorus fertilizers. The positive effect of the use of organic fertilizers with microbiological strains, biohumus with additives of the mineral dolomite, BMG - waste from biogas technology and OMU based on phosphogypsum, waste from obtaining ammophos from phosphorites of the Central Kizylkum Desert is shown. The obtained data on the transformation of nutrients in the soil under the influence of these fertilizers make it possible to reduce the rate of mineral fertilizers by 25% or more.