Efeito de diferentes espaçamentos de plantio de Tachigali vulgaris L.G.Silva & H.C.Lima na fertilidade do solo

Abstract

Different planting spacings of forest species can act differently in increasing or decreasing the levels of chemical elements in the soil, which affects its composition and quality. Defining adequate planting spacing for a given forest species is important, not only to optimize productivity, but also for decision-making in the recovery of degraded soils. This work aimed to evaluate the changes occurring in the chemical properties of a soil planted with Tachigali vulgaris at different spacings, approximately seven and a half years old. The work was carried out at Fazenda Gênesis, in the municipality of Dom Eliseu (PA). Soil samples were collected at four depths in 30 m x 50 m plots with four replications for each spacing. Sixteen soil collection points were randomly selected for each plot. The soil samples were sent to the Embrapa Amazônia Oriental laboratory where chemical analyzes were carried out. The PCA results showed that Al was negatively correlated with other soil attributes at all depths. The two-way ANOVA graphs (p < 0.05) demonstrated that the 4 m x 3 m spacing had the highest values in the chemical attributes beneficial to the soil at most depths in relation to at least one of the other two spacings studied, and lower values for Al, making this spacing the most suitable for recovering degraded areas/soils.