PRODUCTION OF CHELATE POLYMER-CONTAINING MICROFERTILIZERS BASED ON HUMIC ACID AND AMMOPHOS

摘要

The present article considers the production process of chelate polymer-containing micro fertilizers based on the humic acid obtained at the decomposition of a coal waste of the Lenger deposit (Kazakhstan) and etherified derivatives of hydrolyzed polyacrylonitrile (EDPAN). The chemical composition of the initial components and produced polymer-containing micro fertilizer determined using scanning electron microscopy, differential thermal and infrared analysis is given. To improve the quality of the fertilizer produced, boric acid, copper sulphate, iron sulphate and ammonium molybdate were added as microelements and the EDPAN as a chelation agent. In the course of the research, it was found that EDPAN acts as a chelation agent owing to the content of carboxyl groups of fatty acids and increases the assimilability of microelements by plants. Also, the elemental analysis showed that the introduction of EDPAN into the mixture promotes the formation of a granular crystalline structure of the chelate polymer-containing micro fertilizers. The micro fertilizers produced are characterized by a high content of humic substances, which participate in the soil structurization, accumulation of macro and micronutrients in the assimilable form and are intended for raising the level of crop yield.