Actinobactérias e adubação orgânica no manejo de Scutellonema bradys no crescimento e nutrição de plantas de inhame

Abstract

This work was carried out to study aspects related to the use of organic fertilizers and actinobacteria, isolated or combined, the S. bradys management and yam plant growth promoting. Was evaluated: 1) The strains ability to produce extracellular enzymes and to solubilize calcium phosphate; 2) The in vitro effect of secondary metabolites produced by actinobacteria strains and plant aqueous extracts in the S. bradys mortality; 3) The effect of soil inoculation and incubation with strains of actinobacteria and organic fertilizers, in the S. bradys population in yam rhizophores, biomass and nitrogen, phosphorus and potassium levels in the yam part aerea. The AC 92 strain, stood out, providing a 42% reduction in the nematodes population in rhizophores when used in combination with Crotalaria juncea. When applied alone, the actinobacteria strains promoted increments of up to 170.7% (AC 26) and organic fertilizers up to 49.9% (Cajanus cajan) in biomass production in the yam aerial part. The interaction between actinobacteria strains and organic fertilizers significant increments of up to 103.5% (AC 92 x Gliricidia sepium) in P content in yam aerial part. Regardless of the application form, the actinobacteria strains and organic fertilizers had no effect on K content in plants. The actinobacteria strains and organic fertilizers, when applied alone, resulted in an increase to 34.7% (AC 92) and 33.9% (Gliricidia sepium) in N content in the aerial part. The actinobacteria strains use and organic fertilizers application presents as a viable alternative for sustainable management of S. bradys, growth and nutrition in the yam crop.