HYDRODYNAMIC AND HYDRODISPERSIVE CHARACTERIZATION OF A FLUVIC CAMBISOL IN THE NORTHEAST REGION OF BRAZIL1

Albedson Miranda Palácio Filho,Sanderson Hudson Da Silva Malta,Lívia Previatello Da Silva,André Maciel Netto,Fernando Cartaxo Rolim Neto,Marcus Metri Corrêa

doi:10.1590/1983-21252020v33n118rc

Abstract

ABSTRACT The determination of the hydraulic and hydrodispersive properties of soil is necessary for the understanding of water dynamics and soil solute transport, and they are used as input data in several models. Determinations of soil hydraulic and hydrodispersive parameters are usually obtained by separate methodologies. Axisymmetric infiltration tests using a single ring infiltrometer with a conservative tracer (KBr) in the field (Beerkan-Solute) lead to the determination of the most realistic hydraulic and hydrodispersive properties of the study area. The objective of this work was the hydrodynamic and hydrodispersive characterization of an irrigated soil, classified as Fluvic Cambisol, from the lowland areas of the northeastern semi-arid region, located in the backwoods of the state of Pernambuco, in the municipality of Serra Talhada-PE. The hydrodispersive parameters were determined with the CXTFIT 2.0 program, using the CDE and MIM models. The studied soil presented hydrodynamic characteristics with high values of sorptivity (S) that were associated with high values of saturated hydraulic conductivity (Ks), indicating that the soil has good permeability and resistance to surface crumbling caused by rain drops or soil management. It was observed the predominance of the convective process, being the CDE model the one that presented the best performance in the transport of the KBr tracer under field conditions, indicating the absence of two water regions mobile and immobile in the studied soil.

Highlights

In recent decades, with the intensification of land use for agricultural purposes, there has been concern about the environment and an interest in studying the leaching of fertilizers (GHIBERTO; LIBARDI; TRIVELIN, 2015) and chemical pesticides (TOCCALINO et al, 2014) in the soil
There are few studies in Brazil related to the determination of hydrodispersive parameters under field conditions, especially with the semi-arid soils in northeastern Brazil (NETTO et al, 2013)
The dry bulk density was lower in the area with banana cultivation when compared with the other two areas, which was expected due to cultural treatments, such as soil preparation, and the incorporation of organic matter, such as crop remains (Table 2)

Summary

Introduction

With the intensification of land use for agricultural purposes, there has been concern about the environment and an interest in studying the leaching of fertilizers (GHIBERTO; LIBARDI; TRIVELIN, 2015) and chemical pesticides (TOCCALINO et al, 2014) in the soil. Applied for the purpose of increasing agricultural productivity, fertilizers and pesticides interact with soil and water, and they may exceed the depth of the plant root system and contaminate groundwater. In this sense, knowing the behavior and destination of water and solute in the soil is of fundamental importance, especially in issues related to environmental impact. There are existing studies in the literature involving solute transport and other chemical substances in laboratory conditions (MILFONT et al, 2006; DING et al, 2014; SIDOLI et al, 2016; RODRÍGUEZ-LIÉBANA; MINGORANCE; PEÑA, 2018) and field conditions (DYNIA; SOUZA; BOEIRA., 2006; COPPOLA et al, 2011; GHIBERTO; LIBARDI; TRIVELIN, 2015). There are few studies in Brazil related to the determination of hydrodispersive parameters under field conditions, especially with the semi-arid soils in northeastern Brazil (NETTO et al, 2013)

Objectives

Methods

Results

Conclusion