Fig. 1
a Geographical location of the soil sampling sites in Argentina. b Representative NBRIP plates containing Ca3(PO4)2 as the sole source of phosphorus (P) after plating soil suspensions and subsequent incubation for 7 days at 28 °C. a Total bacteria in NBRIP medium (TBNBRIP), colonies able to develop under P-limiting conditions with and without Ca3(PO4)2 (solubilization halo was enumerated as total bacteria in NBRIP medium), b phosphate-solubilizing bacteria (PSB), i.e., colonies with Ca3(PO4)2 solubilization halo (enumerated as PSB). c Representative ribotype analysis of PSB isolates from Bengolea soils under different cropping practices. NE natural environment, GAP good agricultural practice, BAP bad agricultural practice (see section Site description for a full description of cropping practices and control). RFLP Restriction fragment length polymorphism, Hae, Hinf restriction enzymes HaeIII and HinfI, respectively