Crescimento inicial de cana-de-açúcar inoculada com fungos micorrízicos arbusculares e fósforo

Abstract

The objective of this study was to evaluate the effect of inoculation with different arbuscular mycorrhizal fungi (AMF) species and P levels (KH2PO4) on growth and nitrogen (N) and P contents in plants of sugarcane. The experiment was conducted in a greenhouse using a completely randomized design in a factorial 6×5+1, with 4 replicates, the factors being evaluated: levels of P (0, 50, 100, 200, 400 and 800 mg kg-1), inoculation with AMF (Claroideoglomus etunicatum, Gigaspora albida, Gigaspora margarita, Rhizophagus clarus and indigenous AMF in the area of sugarcane cultivation) and a control without inoculation. At 60 and 90 days after planting at a level 50 mg kg-1 of P plants inoculated with G. albida had greater height. Plants inoculated with G. albida, in level 0 mg kg-1 of P, had 300 % increase in shoot dry matter compared to the absence of inoculation. The maximum production of dry matter of shoots of plants inoculated with G. albida was 149 g associated with 424 mg kg-1 of P. The inoculation with G. albida favors the initial growth and N content of the sugarcane plants, whose dependence and mycorrhizal efficiency was 13.6% and 254%, respectively, at the dose 0 mg kg-1 of P.