Evaluation of Azotobacter vinelandii and Pseudomonas denitrificans in Dioscorea rotundata in field conditions.

Abstract

The free-living or associative rhizobacteria promote plant growth, fix nitrogen and synthesize phytohormones. The combination of these mechanisms contributes to improve the efficiency in the use of nitrogen fertilizers and increase the productivity of crops. The objective of this investigation was to evaluate the effect of Azotobacter vinelandii DVS9 and Pseudomonas denitrificans DVS10under different levels of nitrogen chemical fertilization (50% and 75%) on the yield and nutritional quality of the tubers of Dioscorea rotundata. The study was conducted in the municipality of Morindó, Córdoba (Colombia), using a completely randomized experimental design with an increased factorial arrangement 3x2 + 2, with 3 repetitions. The results obtained indicate that the inoculation of the strain Pseudomonas denitrificans DVS10 reduced the nitrogen fertilization by 25%, the cultivation of yam hawthorn, likewise, this bacterium produced significant increases in the protein and crude fiber contents of the tuber.