Resumo

CARNEIRO, R.F.V.; MARTINS, M.A.; VASQUEZ, H.M.  e  DETMANN, E.. Phosphorus levels and mycorrhizal inoculation growing stylosanthes on the soil under natural conditions. Arch. zootec. [online]. 2010, vol.59, n.227, pp.415-426. ISSN 1885-4494.

This work, carried out under greenhouse, had as objective to evaluate the response of the Stylosanthes to mycorrhizal inoculation and levels of phosphorus in soil no sterilized (natural conditions). A randomized blocks design was used in a 4 x 3 factorial scheme (four phosphorus levels: 0, 60, 120 and 240 mg/dm³ of soil; three microbiology treatments: control; inoculation with Glomus clarum and inoculation with native inoculum), with three repetitions. Two cuts of the aerial part were accomplished every 60 days. It was analyzed the production of dry matter of the aerial part and root, the accumulations of crude protein, P, K, Ca, Mg and S, percentage of mycorrhizal colonization and density of spores. The results demonstrated that the increase of the doses of P increased significantly the studied variables. Those results were evidenced by the presence of the mycorrhizal inoculation, with prominence for the presence of the species Glomus clarum, mainly for the first cut. Was estimated a reduction of 82.8 and 71.3% in the external requirement of P, for the establishment of the Stylosanthes in function of the inoculation with the Glomus clarum and native inoculum, respectively. In the second cut, effect of the microbiology treatments was verified, only for the accumulated amounts of Ca and Mg. The mycorrhizal colonization and the density of spores were not affected for the microbiology treatments.

Palavras-chave : Forage; Glomus clarum; Native inoculum; Mineral nutrition; No sterilized soil.

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