Effect of beneficial soil microbes and inorganic fertilizers on soil nitrogen, chlorophyll and yield of upland rice on Ultisols

Abstract

The beneficial soil microbes influence plant growth and soil quality. The soil microbes include phosphate solubilizing microbes and nitrogen-fixing bacteria. The experiments had been conducted to investigate the application of phosphate-solubilizing mircrobes and nitrogen-fixing bacteria and N, P, K fertilizers on soil nitrogen (N), chlorophyll and yield of upland rice on Ultisols. This experiment arranged in a factorial Randomized Block Design, consisted of two factors with three replications. The first factor consisted of beneficial soil microbes, which were without soil microbes; with microbial consortia 1 (Pseudomonas mallei, P. cepaceae, Aspergillus niger and Penicillium sp., Azotobacter chroococum, Azospirillum sp.); with microbial consortia 2 (Azotobacter choroococum, A. viilandii, Azospirillum, Pseudomonas cepaceae, Penicillium and Acitenobacter); and mixed of mcrobial consortia 1+2. The second factor were NPK fertilizers with four levels (100%, 75%, 50% and 25% dosage of recomendation). The results showed that the application of the beneficial soil microbes and N, P, K fertilizers didn't improve soil N, chlorophyll content and yield upland rice on Ultisols.