Bone and ash-based P biofertilizers and an aq. suspension of ash were used for growing spring wheat and compared with phosphorite and superphosphate in growth dynamics, biomass accumulation and selected physiol. attributes of the plants in field expts. The grain mass increase in plants fertilized with the biofertilizer was higher than that fertilized with phosphorite and comparable to that fertilized with superphosphate. The photosynthesis intensity was at the same or at a higher level than after use of conventional fertilizers. The other growth parameters did not differ significantly.