Abstract
One of the most effective ways to increase the yield and quality of crops, restore soil fertility is the use of humate-containing organo-mineral fertilizers. The purposeof the work is to obtain highly effective humate-containing organo-mineral fertilizersby the interaction of phosphorite and sodium humate in acidic environments. Methodology.Methods of chemical and physicochemical analysis were used: infrared spectroscopy, X-ray phase analysis, scanning electron microscopy.Results and discussion. The influence of the norm of a mixture of acids (80-110% by stoichiometry) and the amount of sodium humate (100-150 g), temperature (20-60°C) on the interaction process in a complex heterogeneous system "phosphorite -a mixture of phosphoric and nitric acids -sodium humate" was studied. The optimal conditions for obtaining humate-containing organo-mineral fertilizers were determined: the norm of the mixture of acids from stoichiometry is 90%, the amount of sodium humate is 130 g, the temperature is 60 ° C.Conclusion.It has been established that the addition of sodium humate to the process of decomposition of phosphorite with a mixture of phosphoric and nitric acids inhibits the retrogradation of P2O5, increases the coefficients of water-soluble and assimilable forms of phosphorus, reduces the amount of acidic reagent by 10% of the stoichiometry and neutralizes the free acidity of suspensions. On the basis of the conducted studies, humate-containing organo-mineral fertilizers were obtained, containing I eatdigestible forms of phosphorus Kusv.> 90% and more than 68% of nutrients.