Inoculação com Rhizobium tropici e adubação nitrogenada em diferentes cultivares de feijão na Região das Missões - RS

Abstract

The common bean plant (Phaseolus vulgaris L) is the most cultivated species in the world among the others of the Phaseolus genus, and Brazil is the major producer and consumer. The crop is demanding on nutrients, with Nitrogen being the most important and the biggest limiter of productivity. This demand can be met through the use of nitrogen fertilization and seed inoculation. Thus, the goal of this study was to evaluate the efficiency of inoculation and nitrogen fertilization in different bean cultivars. The experiment was carried out in the experimental area of UFFS – Cerro Largo – RS, Brazil, in a completely randomized design, in a 3 x 4 factorial scheme, with four replications, totaling 48 experimental units. The first factor consisted of three bean cultivars, from the black group the cultivars will be evaluated (BRS Esteio and IPR Uirapuru) and in the carioca group will be evaluated the cultivar (Pérola). The second factor to the use (WI - with inoculant) or not (NI - no inoculant) of inoculant in the seeds with (40N) or without (0N) nitrogen fertilization in the dose of 40kg N ha-1 , constituting the NI 0N, WI 0N, NI 40N, WI 40N treatments. The results were subjected to analysis of variance, and the means compared to each other by the Scott-Knott test at 5% significance, in the SISVAR statistical program. There was no interaction between bean cultivars with nitrogen fertilization and the ones using inoculants. The cultivar BRS Esteio was the best cultivar in terms of the variables evaluated. Nitrogen fertilization positively influenced the chlorophyll content in V3 and R6 and increased the number of pods/plants, however it didn't influence the other components of the yield. There was no positive response to inoculation.