INFLUÊNCIA DE MICRONUTRIENTES VIA TRATAMENTO DE SEMENTES NA FIXAÇÃO SIMBIÓTICA DE NITROGÊNIO DE GENÓTIPOS DE FEIJÃO

Abstract

The common bean (Phaseolus vulgaris) is an annual legume that has genetic characteristics capable of performing symbiotic nitrogen fixation (FBN). Aiming to reduce fertilization costs, breeders are increasingly seeking to develop cultivars that meet their nitrogen needs, through FBN. With this in mind, the present work aimed to evaluate the influence of the use of micronutrients via seed treatment on the FBN of bean genotypes, in their initial phase of development. The experiment was developed in a 21x2 factorial scheme, in which the first factor refers to the genotypes and the second factor to whether or not the seeds were treated with micronutrients. The trial was conducted with four replications in a randomized block design in a greenhouse. All seeds were treated with liquid inoculant based on Rhizobium tropici. The micronutrient-based seed treatment was carried out with cobalt, molybdenum, nickel and zinc. 20 days after sowing, evaluations were carried out: plant height, stem diameter, number of trefoils, root length and dry mass of the shoot and root. The best seed treatment, with or without micronutrients in the inoculant, depends on the bean genotype. In general, the CNFC20214 genotype is the one that best responds to treatment with inoculant alone. The CNFC15490 genotype responds best to the addition of micronutrients to seed treatment. Furthermore, it stands out with higher averages of plant height, number of trefoils, aerial part dry mass and root dry mass.