The question aims to figure out the best nutrient needs and application techniques for growing mushrooms in polybags using substrates other than traditional straw. In order to properly integrate these nutrients into the growing system, it explores different application methods, ascertains the optimal dosages or concentrations, and pinpoints the precise sorts of nutrients required for mushroom growth. The goal is to maximize mushroom yields and quality by taking care of these factors and making use of substitute substrates and container systems like polybags.