Caracterização de matéria orgânica de cupinzeiros do Agreste Alagoano: perspectivas de aplicação agrícola

Abstract

Termites, considered as pests in agricultural crops, may represent a source of nutrients for agricultural application, due to the presence of organic matter derived from the action of the organisms. The soil, type of vegetation and organisms directly influence the characteristics of this material. In this sense, the present work aimed to extract and characterize the organic matter present in mounds of termite mounds in pasture in two cities in the agreste region of Alagoas, São Sebastião and Feira Grande. Studies were carried out on the physical-chemical composition of the soil that makes up the mounds of termite mounds. The analyzes consisted of the determination of pH in water, organic matter of the samples was determined by the calcination method. The micro, macronutrients and metallic species were determined in the soil samples by atomic emission spectroscopy with plasma induced by microwave (MP-AES)) and physical attributes (soil texture, soil bulk density, particle density, total porosity and SH extraction occurred using the method adopted by the International Society of Humic Substances (IHSS). Absorbance readings were taken at 270nm, 407nm, 465nm and 665nm, through the E4/E6 ratio, the E2/E4 ratio. The characterization of the SH samples was carried out by ultraviolet spectroscopy in the visible region and Spectroscopy in the Infrared Region with Fourier Transform - FTIR. The micro, macronutrients and metallic species were determined by the open system digestion method. Therefore, the present research becomes relevant to obtain knowledge the most in-depth on the organic matter of mounds of termite mounds from pastures in the agreste of Alagoas for agricultural application, mainly in regions subject to desertification such as the agreste of Alagoas.