Assumptions of a research project on a new technol. for prodn. of phosphate fertilizers by microbial solubilization based on renewable raw materials (bones, fishbone and ashes from burning sludge from biol. wastewater treatment plant). A selection of microorganisms suitable for solubilization of P-contg. raw material will be done. Lab. and pilot scale expts. will be carried out. Liq. and granular fertilizers will be produced.