Phosphorus
availability was measured colorimetrically by the
Murphy and Riley (1962) method. Bacteria growth was
estimated by measuring absorbance at 660 nm. Samples
from cultures grown in NBRIP medium were diluted
1:1 (v/v) with 1 N HCl to dissolve the residual insoluble
phosphate and measured against a blank (Rodríguez et al.,
2000)