Crescimento e nodulação de Enterolobium contortisiliquum cultivado em solos de diferentes sistemas de uso no Sudoeste do Piauí

The aim of this study was to evaluate the effect of soil use systems from Southwest of Piaui State, Brazil, in growth and natural nodulation of tamboril [ Enterolobium contortisiliquum (Vell) Morong] seedlings. The experiment was conducted in greenhouse at the Federal University of Piaui, in Bom Jesus, PI. The experiment design was completely randomized with ten replications. Treatments were consisted of four soil use systems (two areas of native forest, one grassland and one agriculture area). Seedlings were collected 85 days after planting, when height (H), collar diameter (CD), number of nodules (NN), nodule fresh matter (NFM), shoot (SDM), roots (RDM) and total dry matter (TDM), ratio of shoot and roots dry matter (SDM/TDR), Dickson quality index (DQI) and nitrogen accumulation in shoots (NAS) were evaluated. Nodulation occurred in all soil use systems. Seedlings grown under soils from agriculture and grassland areas showed higher performance on nodulation, H, CD, SDM and NAS than soils from native forest areas.