Effects of different innovative bone char based P fertilizers on bacteria catalyzing P turnover in agricultural soils

Phosphorous (P) is one of the most critical macronutrient elements for plant growth, yield and quality. However, natural P sources are finite an improved recycling necessary. Therefore, we investigated effect bone char (BC) plus (BCplus) as products alternative fertilizers, on abundance microorganisms, which catalyze major steps in turnover a field experiment Central Germany. The effects were compared to conventional triple super phosphate (TSP) no fertilization. Samples analyzed from soils with three different initial soil concentrations (very low, optimal) times during winter wheat cultivation (stem elongation, heading, ripening) reveal interactions fertilizers properties. Abundances microorganisms involved uptake, solubilization mineralization assessed by quantitative real time PCR (qPCR). Additionally, potential acidic- alkaline phosphatase activity, water extractable available measured. Bacterial strategies maintain pools differed among treatments. While addition BCplus increased potential, low concentration control plots slow release BC favor biomass inducible uptake systems, displayed either high bacteria harboring phoD or pstS gene, respectively. All pronounced at heading optimal concentration. It can be assumed that sulfurization influences bacterial promoting fertilizer thereby increasing availability plants. development stage hamper turnover.