Coinoculação com bactérias promotoras do crescimento de plantas e disponibilidade hídrica em feijão-caupi

Abstract

Crops when taken to field conditions can be subject to water imbalance which can lead to high losses in grain yield. Inoculation with plant growth-promoting bacteria may be an alternative as some species have the ability to fix N2, incite root growth and production of beneficial metabolites to plants under stress conditions. This work aims to evaluate co-inoculate A. brasilense and B. japonicum efficiency in cowpea associated with water availability. The study was carried out in a greenhouse in the experimental area of Federal University of Rondonópolis in a completely randomized block design in a 4x4 factorial arrangement with 4 replications, the treatments was: i) non-inoculated; ii) inoculation with Bradyrhizobium japonicum; iii) co-inoculation with B. japonicum and A. brasilense and iv) N-fertilizer, associated with 4 soil water tensions, 15, 30, 45 and 60 kPa. Soil water tensions were verified using tensiometers and the water volume to be irrigated was calculated using a soil water retention characteristic curve. Among the variables analyzed are phytometric characteristics, productive components, dry matter accumulation, nudulation and root growth. The data were submitted to a normality test with subsequent analysis of variance and regression analysis, all up to 10% probability. Co-inoculation showed phytometric characteristics similar to nitrogen fertilizer. At the highest tensions, there was a reduction in the formation of nodules and co-inoculation had the highest number of nodules.