Improving the Chemical Properties of Acid Sulphate Soils from the Casamance River Basin

Inmaculada Bautista (), Joana Oliver, Antonio Lidón, Jose María Osca and Neus Sanjuán
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Inmaculada Bautista: Research Group in Forest Science and Technology (Re-ForeST), Research Institute of Water and Environmental Engineering (IIAMA), Universitat Politècnica de València, Camí de Vera s/n, 46020 Valencia, Spain
Joana Oliver: Research Group in Forest Science and Technology (Re-ForeST), Research Institute of Water and Environmental Engineering (IIAMA), Universitat Politècnica de València, Camí de Vera s/n, 46020 Valencia, Spain
Antonio Lidón: Research Group in Forest Science and Technology (Re-ForeST), Research Institute of Water and Environmental Engineering (IIAMA), Universitat Politècnica de València, Camí de Vera s/n, 46020 Valencia, Spain
Jose María Osca: Departamento de Producción Vegetal, Universitat Politècnica de València, 46020 Valencia, Spain
Neus Sanjuán: Research Group in Analysis and Simulation of Food Processes (ASPA), Departamento de Tecnología de Alimentos, Universitat Politècnica de València, 46020 Valencia, Spain

Land, 2023, vol. 12, issue 9, 1-20

Abstract: The anoxic conditions produced after the reflooding of acid sulphate soil (ASS) can reduce sulphate and/or Fe(III) with a consequent rise in pH. This study aimed to compare the effect of different amendments on ASS remediation and to analyse the effect on soil pH and exchangeable aluminium. Two mid-term incubation experiments were carried out to analyse the effect of amendments and water management on ASS. Soil samples were taken in the Santak Valley from four agricultural plots. During the first experiment, each soil sample was subject to two water management systems (flooded and non-flooded) and three amendment types (rice straw, manure, and lime). During the second experiment, the flooded condition was performed with three organic amendments (rice straw, manure, and biochar). In the first experiment, the amendments with organic matter (rice straw, and manure) increased the pH more under the flooded conditions, and manure was effective in reducing exchangeable aluminium (Al ex ) to 45% in the control soil. In the second experiment, all the organic amendments reduced soluble Al, but whereas straw increased soluble Fe, biochar diminished it. The amendment addition increased the soil pH and reduced Al ex . The Al ex reduction was greater for the stabler organic amendments: manure and biochar.

Keywords: iron toxicity; acid sulphate soils; exchangeable aluminium; redox potential; organic amendments (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jlands:v:12:y:2023:i:9:p:1693-:d:1228230

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