Fungos micorrízicos arbusculares e resíduos orgânicos em mudas de Peltophorum dubium (Spreng.) Taub

Abstract

The study of the relationship between arbuscular mycorrhizal fungi (AMFs), organic residues of animal origin in seedlings of forest species of economic or environmental interest are important in the symbiotic process in plants, and can directly reflect on the quality and increase in seedling biomass, through the increased efficiency in the use of nutrients in organic waste. Based on the above, research that evaluates the influence of mycorrhizal fungi and fertilization with organic residues is important for the development and expansion of promising forest species. Thus, the objective of this work was to study the responses of canafistula seedlings to AMFs and organic residues. The experiment was carried out in a greenhouse for 150 days, in a completely randomized design (DIC), in a 6x4 factorial arrangement, with four replications. The treatments were: control - without AMFs, Glomus clarum, Gigaspora margarita, Gigaspora albida and Clareoideoglomus etunicatum and MIX of species, associated with the use of three types of organic waste (chicken bed, bovine manure and sheep manure added to a composite base substrate by soil + sand (coarse) in substitution to chemical fertilization, being the treatments: soil + sand (control), soil + sand with chicken litter, soil + sand with bovine manure, soil + sand with sheep manure). Plant height (cm), diameter (mm) and height x diameter ratio (HRD) were evaluated after 30, 60, 90, 120 and 150 days after transplanting, and in the final evaluation, at 150 DAE, were evaluated: fresh shoot weight, fresh root weight, total fresh weight, dry shoot weight, dry root weight, total dry weight, shoot x root ratio, Dickson quality index (IQD), dependency and efficiency mycorrhizal. The species of arbuscular mycorrhizal fungi C. etunicatum and G. albida moderately influenced the increase in seedling biomass. The seedlings showed no mycorrhizal dependence, however, positive symbiotic efficiency for the species C. etunicatum and G. albida. The seedlings responded significantly to the use of Chicken litter, bovine manure and sheep manure, which increased positively as responses to growth and dry matter production.