A research was conducted into the influence of effective microorganisms (EM) and sheep manure on the duration of the process of composting, compost quality and the cost effectiveness of the process. Physical, chemical and biological characteristics of initial material and the prepared compost were analysed. The results of the analysis indicate that 200 days, for how long the process lasted, is not enough to produce a stable and mature compost suitable for use as fertilizer and substrate for production of transplant plants, while the fertilizer obtained by composting straw mixed with sheep manure and inoculated with EM is of the highest quality.Obavljeno je istraživanje utjecaja efektivnih mikroorganizama (EM) i ovčjeg gnoja na trajanje procesa kompostiranja, kvalitetu komposta i ekonomsku isplativost postupka. Analizirana su fizikalna, kemijska i biološka svojstva početnog materijala i gotovog komposta. Rezultati analiza pokazuju da je 200 dana, koliko je proces trajao, nedovoljno da bi se dobio stabilan i zreo kompost, pogodan za uporabu kao gnojivo i supstrat za proizvodnju presadnica, a najkvalitetniji je bio onaj dobiven kompostiranjem slame miješane s ovčjim gnojem i inokulirane EM
