Influence of Azotobacter inoculation on the availability of nitrogen in soil

Abstract

The change of N in the availability pool was sigmoidal with control and P; sinusoidal with inocula and P as well as with organic matter and P. The response was quasi-sigmoidal with organic matter and inocula. Amongst the single and dual combinations, Azotobacter cAroococctfw in the presence of organic matter performed better. Interaction of inocula, P and organic matter showed flattened to sharp sigmoidal change in the availability of , N. Both A. chroococcum and A. macrocytogenes in the presence of organic matter and higher dose of P exhibited better influence with well defined crest. Between the two inocula, Azotobacter chroococcum was more effective. Nitrogen availability was maximal at 20-day in all treatments under the experimental conditions.