Uso de propriedades físico-hídricas do solo na identificação de camadas adensadas nos Tabuleiros Costeiros, Sergipe

Abstract

A presença de camadas subsuperficiais no solo fortemente adensadas, afeta a infiltração e o movimento de água dificultando o manejo da água durante a irrigação. Visando identificar e caracterizar essas camadas coesas nos tabuleiros do Platô de Neopolis de Sergipe se determinaram e se utilizaram as propriedades físico-hídricas do solo densidade, porosidade, retenção da água e condutividade capilar. A Condutividade Capilar foi determinada através do método do perfil instantâneo empregando-se o modelo de Libardi. Os atributos físicos determinados (densidade, porosidade, retenção da água e condutividade capilar) mostraram-se adequados à identificação e caracterização do caráter coeso da camada quando presente no perfil do solo.

Detailed soil survey of an experimental watershed representative of the Brazilian Coastal Plains and its practical application

“…The soils of the Coastal Plains originated from pre-weathered sediments of the Barreiras Formation and their main land uses are sugarcane, livestock, silviculture, and orchards (Souza et al, 2004;Fonsêca et al, 2007;Costa et al, 2009c). The dominant soil class is Yellow Argisol (Carvalho Filho;Fonseca, 2013), presenting chemical and physical properties somewhat restrictive to management.…”

“…The dominant soil class is Yellow Argisol (Carvalho Filho;Fonseca, 2013), presenting chemical and physical properties somewhat restrictive to management. Chemically, the restriction is caused by the low cation exchange capacity and nutrient contents, due to the essentially kaolinitic nature of the Barreiras Formation sediments and the weathering-leaching processes, while the physical restrictions are related to the low permeability and cohesive subsurface horizons that prevent plant root deepening, thus limiting water and nutrient absorption by the roots (Fonsêca et al, 2007), as a natural consequence of reducing the effective soil depth explored by the root system. However, these constraints can be minimized through management practices, mainly for perennial crops, such as the use of fertilizers and subsoilers to overcome the chemical and physical constraints, respectively.…”

Pedotransfer Functions for Water Retention in the Main Soils From the Brazilian Coastal Plains

“…The soils are mainly derived from pre-weathered sediments of Barreiras Formation and the more expressive uses are sugarcane, cattle raising, forestry (eucalyptus) and fruticulture (Fonsêca et al, 2007). A remarkable characteristic of those soils are the cohesive subsuperficial horizons, which difficult the root system deepening and maximize the water stress mainly for perennial crops (Carvalho Filho;Fonseca, 2013).…”