Variabilidade de fósforo e potássio disponível no solo em diferentes espaçamentos de plantio de Tachigali vulgaris

The objective of this work was to evaluate the vertical and horizontal variability of the content of phosphorus and potassium on the soil of a “tachi-branco” (Tachigali vulgaris) plantation, with approximately seven and a half years old, in three spacings, located in Dom Eliseu, PA. Sample plots were arranged in randomizes blocks with four replications, in which 16 soil collecting points were randomly selected at four depth. The collected soil samples were transported to the soil laboratory of the Agricultural Research Corporation of Belem/Para “Embrapa Amazonia Oriental”, where the chemical analyzes was carried out. It was concluded that in the denser spacings, there was a significant difference between the depths for the phosphorus and potassium content, showing a higher proportion in the soil surface. However, in relation to total depth, results showed significant difference between the spacings, such as thicker and less thick.