Resposta do feijão caupi à inoculação com rizóbio e doses de molibdênio

Abstract

Cowpea (Vigna unguiculata (L.) Walp) is a crop with great economic potential in the country. However, most of the production is linked to family farming, being scarce the investment in technological innovations for culture, which propels alternative technologies such as inoculation with diazotrophic bacteria. In this way, was objetified evaluate the development of cowpea as a function of inoculation with rhizobium and the application of molybdenum doses. The experiment was carried out under greenhouse conditions, in vessels with a volume of 2 dm3, using Dystrophic Oxisol as substrate. Was imployed the randomized block design, following the 5x2 factorial scheme, being 5 doses of molybdenum (0, 40, 80, 120 e 160 g ha-1) and two strains of diazotrophic bacteria, with 5 replicates, totaling 50 experimental units. Were collected plant height data, stem diameter, Falker chlorophyll index, number of pods per plant, number of nodules, dry mass of the aerial part, root volume, root dry matter, dry mass of nodules, total dry mass (aerial part+root), number of grains per pod and mass of grains per pot. The data were submitted to analysis of variance and, when significant to the regression test and Tukey by the statistical program Sisvar. Of the analyzed variables, the Falker chlorophyll index, shoot dry mass, number of pods and dry mass of nodules presented a significant difference for strain BR 3267. In isolation, molybdenum doses had no influence on the analyzed variables, as well as rhizobia strains. The inoculation with molybdenum doses influenced root dry mass of cowpea plants.