https://biotechnology.kiev.ua/index.php/en/journal-archive-en/2026-en/2026-en-no2

The need for sustainable agriculture and a circular economy encourages the search for effective ways to utilize organic waste and transform it into valuable resources. Digestate, a by-product of anaerobic digestion of organic materials (biogas residue), is a promising organic fertilizer. This article presents a comprehensive analysis of the quality of digestate obtained from a mixture of coffee, barley, and chicory waste, based on detailed biochemical studies. Purpose. The aim of the study was to assess the physicochemical properties of the digestate, the content of macro- and microelements, the amino acid profile, the potential presence of biostimulants, microbiological safety, and the concentration of heavy metals in comparison with regulatory requirements. Materials and Methods. The physicochemical and microbiological parameters of the digestate derived from a mixture of coffee, barley, and chicory wastes were analyzed using standard methods. Results. The obtained data indicate the agronomic feasibility and environmental safety of using this digestate as an organic fertilizer. The analysis of digestate derived from coffee, barley, and chicory wastes demonstrates its potential as a high-quality, safe, and multifunctional organic fertilizer that provides essential macro- and microelements, improves soil physicochemical and biological properties, and exhibits biostimulant activity. Conclusions. The digestate produced from a mixture of coffee, barley, and chicory wastes is an environmentally friendly, safe organic fertilizer with high agronomic potential and may be recommended for improving soil fertility and crop yields.