Journal of Biotechnology and Biodiversity Response of cowpea to inoculation with nitrogen-fixing strains in Gurupi-Tocantins State

Rita De Cassia Cunha Saboya, Paulo Rogério, Siriano Borges, Luciano Marcelo, Fallé Saboya, Fábio Pinto, Reis Monteiro, Shara Alves De Souza, Adão Felipe, Dos Santos, Elonha Rodrigues, Dos Santos
2013 J. Biotec. Biodivers   unpublished
This study evaluated the effect of inoculation with nitrogen-fixing strains in cv. Vinagre cowpea at conditions of the southern state of Tocantins. The experiment was conducted in 2007/2008 harvest. The experimental design was randomized blocks with seven treatments and four replications. We tested five inoculants of bacteria: BR3301, BR3302, BR3262, BR3267 and BR3299, two controls, one with NPK and a control without fertilization or inoculation. At 35 and 55 days after emergence were evaluated
more » ... the following variables: number of nodules, nodule dry mass, dry mass of shoots and relative efficiency. At the end of the cycle was evaluated the number of pods per plant, weight of pods per plant and grain yield. The data were subjected to analysis of variance by F test and means were grouped by Scott-Knott, both at 5% probability. The association between the means was assessed by Pearson correlation. The BR3302 strain showed higher dry weight of nodules at 35 and 55 DAE, however the control without fertilization or inoculation and the one with NPK contributed to higher grain yield. The number of pods and weight of pods per plant were the variables that most influenced yield. It is necessary to further study on the selection of strains of nitrogen fixing bacteria to the ecological conditions of the southern state of Tocantins.