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Diagnostic des Contraintes de Mise en Valeur Rizicole des Sols Fluvio-Marins du Marigot de Bignona, Basse Casamance, Sénégal
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fall, Aidara Lamine Sané, Yancouba |
| Copyright Year | 2020 |
| Abstract | Located in Lower Casamance, southwestern Senegal, the Bignona valley was severely affected by the drought of the 1970s. The drop in rainfall and river flow brought about salinization and acidification of rice fields. The objective of this study is to analyze the constraints of rice growing in fluviomarine soils of the Bignona valley, in order to propose sustainable management strategies. Seven localities (Tenghory Transgambienne, Tenghory, Boutolate, Bindago, Piran, Koutenghor and Diourou) were selected. This choice is motivated by the important degradation of rice fields by salinization and acidification. The methodology includes field surveys, soil sample analysis and land cover mapping. The results show widespread salinization and acidification of rice-field soils, with soil electrical conductivity between 0.01 and 9.77 mS/cm and pH values between 4,7 to 7,8. Marine intrusion and pyrite oxidation are, respectively, the main factors responsible for the salinization and acidification of these soils. The iron accumulation under anaerobic conditions induces another soil management constraint, namely the iron toxicity, which greatly affects the performance of rice growing. The combination of strategies appears as the most appropriate method to promote rice growing in the Bignona valley. Situe en Basse Casamance, sud-ouest du Senegal, le marigot de Bignona, a ete durement eprouve par la secheresse des annees 1970. La baisse pluviometrique et de l’ecoulement fluvial y ont entraine la salinisation et l’acidification des rizieres. L’objectif de l’etude est d’analyser les contraintes de mise en valeur rizicole des sols fluvio-marins du marigot de Bignona pour la proposition de strategies d’amenagement durables. Sept localites (Tenghory Transgambienne, Tenghory, Boutolate, Bindago, Piran, Koutenghor et Diourou) ont ete choisies. Ce choix est motive par l’ampleur de la degradation des rizieres par salinisation et acidification. La methodologie comprend des enquetes de terrain, l’analyse d’echantillons de sol et une cartographie de l’occupation du sol. Les resultats montrent une salinisation et une acidification generalisees des rizieres dans le marigot de Bignona, avec une conductivite electrique comprise entre 0,01 et 9,77 mS/cm et un pH entre 4,7 a 7,8. L’intrusion marine et l’oxydation de la pyrite sont, respectivement, les principaux facteurs responsables de la salinisation et l’acidification de ces sols. L’accumulation du fer en conditions anaerobies induit une autre contrainte, en l’occurrence la toxicite ferreuse. La combinaison de strategies apparait comme la meilleure methode pour developper la riziculture dans le marigot de Bignona. |
| Starting Page | 359 |
| Ending Page | 359 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.19044/esj.2020.v16n3p359 |
| Volume Number | 16 |
| Alternate Webpage(s) | http://www.eujournal.org/index.php/esj/article/download/12791/12667 |
| Alternate Webpage(s) | https://doi.org/10.19044/esj.2020.v16n3p359 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
