The effect of nitrogen-fixing bacteria towards upland rice plant growth and nitrogen content

Abstract

This study was performed to observe the associative effect of Nitrogen-fixing bacteria and combination of each with nitrogen dosage on Nitrogen content and upland rice plant growth. Klebsiella pneumonia and Azospirillum brasilense were applied, while urea used as fertilizer on 0, 25, 50, and 75 kg N/Ha. The result revealed that inoculation of nitrogen-fixing bacteria to upland rice can increase tiller formation, shoot and root dry weight and plant N Total production. The effect of A. brasilense on increase tiller formation, biomass dry weight (shoot and root) and N total production revealed to tendency to increase compare to K. pneumonia. Differences in nitrogen fertilizer did not cause a significant effect on all parametric measured, except plant N content. Bacteria and nitrogen fertilizer interaction did not cause a significant effect on all parametric measured. From the regression analysis, there was a correlation between root dry weight with shoot dry weight; and the correlation between root dry weight with plant N total production.