agriculture Article Sulfur-Enriched Bone Char as Alternative P Fertilizer: Spectroscopic, Wet Chemical, and Yield Response Evaluation Dana Zimmer 1,2, Kerstin Panten 3 , Marcus Frank 4,5 , Armin Springer 4 and Peter Leinweber 1,5,* 1 Soil Science, University of Rostock, Justus-von-Liebig-Weg...