VELCOIDADE DE INFILTRAÇÃO PELO MÉTODO DO INFILTRÔMETRO DE ANEL EM DIFERENTES TEXTURAS DE SOLOS

Abstract

Water infiltration into the soil is the process by which water percolates through the soil system from the surface, playing a crucial role in the planning of sprinkler irrigation systems and soil water management. This study aimed to measure the Infiltration Rate (IR), Accumulated Infiltration (AI), and Basic Infiltration Rate (BIR) using the ring infiltrometer method, which consists of two concentric cylinders (50 and 25 cm in diameter and 30 cm in height) buried in the soil. The study was conducted in three types of soils: Sandy, Clayey, and Very Clayey, located in the municipalities of Formoso-MG, Formosa-GO, and Planaltina-DF, respectively. After analysis, the coefficients of the Kostiakov equation for estimating accumulated infiltration were calculated using Linear Regression Analysis. The equation for estimating the infiltration rate was obtained by deriving the accumulated infiltration equation. The determination of BIR using the ring infiltrometer method proved to be feasible, simple, and practical, and can be applied in other regions. The measured BIR in different textures was classified as: medium for sandy soil (15 mm h-1), high for sandy soils due to the presence of macropores, while clayey soils showed low BIR due to micropores retaining water in the system. The clayey soil showed medium BIR (5 mm h-1), and low for the very clayey soil (3 mm h-1).