Study of the process of producing complex organomineral fertilizers based on humin-containing superphosphate with additions of nitrogen and potassium salts

The possibility of obtaining complex organomineral NPK-fertilizers based on nodular phosphorites of Karakalpakstan and washed burned concentrate (WBC-26) from Kyzylkum phosphorites by treating them with a product of oxidized and ammoniated brown coal from the Angren deposit with subsequent addition of potassium sulfate, ammophos, urea and ammonium nitrate powders to the mixture, has been shown. The phosphate mineral of the Khodzhakul raw material consists of kurskite and francolite in equal quantities, and the Porlytau raw material consists of kurskite only. WBC-26 is of granular type, the main mineral of which is francolite. It has been established that among the developed complex fertilizers, the most concentrated in terms of the amount of nutrients is the product obtained in the presence of urea. In products made from nodule phosphate flour of Karakalpakstan, the relatively high relative content of the digestible form of phosphorus indicates their high reactivity. When introducing the proposed new types of complex fertilizers based on local raw materials, the soil structure noticeably improves, while expensive mineral fertilizers are saved by 30–35 %, and irrigation water – by 10–12 %. Additionally, cotton yield increases by 2–4 %.

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