The objective of this work was to evaluate the effect of sewage sludge soil amendment, on nodulation and N2 fixation on bean nodulated with native rhizobia in greenhouse. Treatments were: no fertilization and no sludge; complete fertilization; 14.8 t ha-1, 29.6 t ha-1 and 59.2 t ha-1 of sewage sludge; and bean inoculated with selected rhizobia strains+N at planting. The doses of sewage sludge were calculated based on N crop requirement. The highest values obtained with the acetylene reduction activity, nodule number and mass by doses 14.8 t ha-1 and 29.6 t ha-1 of sludge demonstrated that soil amendment with sludge may increase bean native rhizobia efficiency.
Phaseolus vulgaris; nitrogenous fertilization; nitrogenase activity; biosolid
