FIELD: chemistry.
SUBSTANCE: invention relates to agriculture. A method of producing a compound bio-preparation from humus-containing substances via alkaline extraction, separating and neutralising the alkaline extract, wherein alkaline extraction is carried out with 0.1 M potassium pyrophosphate in 0.1 n KOH solution or 0.1 M sodium pyrophosphate in 0.1 n KOH solution or 0.1 M sodium pyrophosphate in 0.1 n NaOH solution at 80°C, and after separation, neutralising the alkaline extract with nitric acid HNO3 to pH 7.0-8.0, mixing, settling and obtaining a liquid end product.
EFFECT: invention increases the content of humic substances in the end product, enables to control the amount and ratio of sodium and potassium in the end product, as well as potassium and sodium salts of humic substances, increases the content of common phosphorus in the end product owing to the use of sodium pyrophosphate in the extractant, and common phosphorus and common potassium when using potassium pyrophosphate.
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