Estudo da Fertilidade para alunos do Ensino Médio/Plantas Medicinais da Região de Tefé

Abstract

Given the infertile scenario of Amazonian soils, it is possible to observe the presence of patches of dark, highly fertile soil called Terra Preta de Índio (TPI), which have a high amount of organic matter and high concentrations of calcium (Ca2+) and phosphorus (P) . This work aimed to characterize the chemical parameters and texture of TPI soils in depth and understand the forms of fractionation of inorganic P (Pi) in the TPI profile of the Caiambé District. To characterize the TPI, analyzes of soil fertility parameters, granulometry and textural classification were carried out. The fractionation of Pi was done according to Chang and Jackson (1957), with some modifications suggested by Novais and Kamprath (1978). The amounts of P in the fractionation extracts were quantified by UV-Vis spectroscopy using the ascorbic acid method at a wavelength of 885 nm. The granulometric analysis indicated a predominance of the sand fraction and a low clay content on the surface. The chemical attributes showed high variability with depth and the fractionation results demonstrated that the high levels of P observed came, above all, from the source material, highlighting that the form of P linked to Ca was predominant in relation to the other forms of fractionation. . In this sense, the results obtained contributed to the understanding of the Caiambé TPI matrix at various depths, as well as the dynamics of the inorganic fractions of P at depth