B-FERST’s main objective is to integrate the valorisation of bio-wastes in agriculture management plans creating anew circular and bio-based value chains considering a bilateral interaction between farming and fertiliser sectors focused on a paradigm shift in the fertiliser value chain with 8 specialised fertilisers. Specialised nutrient mixes are required to achieve a more sustainable management of resources by tailor-made nutrient dosing adapted to farmer systems. The SUSTAINABILITY of B-FERST is based on the reuse of bio-waste to replace non-renewable, non-domestic and energy intensive raw materials: 1) Bio-based solid fertilisers including renewable sources of macronutrients (N,P,K) obtained from 3 by-products streams: i) ashes, as source of P & K from: Waste Water Treatment Plants (WWTP) (sewage sludges), & agri-food such as: slaughterhouse waste, olive & livestock wastes; ii) struvite as source of P & N from WWTP & agro waste (pig slurries), and; iii) compost as source of organic carbon compound, N, P & K from Organic Fraction of Municipal Solid Waste) OFMSW, WWTP & agro waste (manure -livestock-). 2) Biostimulants for soil nutrient improvement from two approaches: selected microbiological strains as Microbial Plant Biostimulant (MPB) or Non-Microbial Plant Biostimulant (NMPB) from cardoon oil meal processing (agricultural by-products) and compost extracts. Bio-degradable coatings based on biopolymers will be used when MPB is added to the fertiliser products to protect the beneficial microorganisms and guaranty their performance. The VIABILITY is based on previous R&D from other RIA projects. The manufacturing process will be demonstrated at a demonstrative industrial scale. Then specialised fertilisers will be performed and validated in 5 crops tests (Spain, Italy, France, Poland and Ukraine) comparing their functionality to that of traditional fertilisers in terms of: sustainable sourcing, logistics, soil and growing conditions, reaching a TRL6