**5. Conclusions**

Recycled phosphorus fertilizers can at least partly replace commercial fertilizers in wheat production. They are less abundant in phosphorus than commercial mineral fertilizers, but they contain numerous macronutrients and micronutrients. Lower rates of recycled phosphorus fertilizers are adequate sources of plant-available phosphorus in soil, and they exert a beneficial impact on the structure of fungal communities colonizing the grain. Wheat grain from the treatments supplied with recycled fertilizer at 40 and 60 kg P2O5 ha−<sup>1</sup> and the *B. megaterium* biofertilizer at 40 kg P2O5 ha−1, was colonized by fungal communities with the most desirable composition and the lowest proportion of plant pathogens. However, the influence of recycled fertilizers on the physiology of field-grown plants and possible interactions with other environmental factors have not been fully elucidated and require further research.

**Author Contributions:** Conceptualization, M.J., U.W. and M.K.K.; methodology, M.J. and U.W.; formal analysis, U.W.; investigation, M.J., U.W. and M.K.K.; resources, M.J., U.W. and M.K.K.; writing—original draft preparation, U.W. and M.J.; writing—review and editing, M.J. and M.K.K.; visualization, M.J. and U.W.; funding acquisition, M.J. and M.K.K. All authors have read and agree to the published version of the manuscript.

**Funding:** This research was funded by the National Center for Research and Development, Poland, grant number PBS 2/A1/11/2013.

**Acknowledgments:** The Institute of New Chemical Synthesis in Puławy is highly acknowledged for providing Rec and Bio-fertilizers for the field experiment. The authors kindly acknowledge the technical support of Kinga Treder and Przemysław Makowski from the University of Warmia and Mazury in Olsztyn.

**Conflicts of Interest:** The authors declare no conflict of interest.
