Diagnostic des Contraintes de Mise en Valeur Rizicole des Sols Fluvio-Marins du Marigot de Bignona, Basse Casamance, Sénégal

Fall, Aïdara C. A. Lamine; Sané, Yancouba

doi:10.19044/esj.2020.v16n3p359

Cited by 1 publication

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“…Different studies conducted under pot or field conditions have indicated that appropriate agronomic management increases rice production in ASS. To cope with iron toxicity, several strategies have been proposed: add mineral fertilisers to improve soil fertility [38]; apply phosphogypsum and lime to increase available Ca and soil pH and lower toxic iron and aluminium levels [34,39,52]; add organic residue, which could stimulate the activity of reducing bacteria [32] to lead to a rise in pH under flooded conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The iron oxides on the inner container wall that formed during the experiment were probably the product of Fe 2+ oxidation. This Fe 2+ was generated by the reduction of Fe (III) in the soil, which requires organic carbon, and it was diffused to the overlaying water, where it was re-oxidised [52]. Consequently, the soil solution was rusty in colour and a fine orange layer appeared in the soil several mm under the soil surface.…”

Section: Discussionmentioning

confidence: 99%

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

Bautista,

Oliver,

Lidón

et al. 2023

Land

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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 (Alex) 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 Alex. The Alex reduction was greater for the stabler organic amendments: manure and biochar.

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