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Improved Management of Acid Sulfate Soils for Rice Production in Casamance, Senegal. [texte imprimé] / N.H. Diallo, Auteur . - 2016 . - p: 75 ; ill. Langues : Anglais ( eng) Catégories : | RESSOURCES NATURELLES ET ENVIRONNEMENT
| Mots-clés : | Gestion, Amelioration des sols, Production, Acide Sol | Index. décimale : | P355-Fertilisation du sol. Besoins en engrais et amendement. Alimentation minérale des plantes. Réponse des plantes | Résumé : | Casamance is a region in southern Senegal that traditionally produces rainfed rice, but Senegal produces only 1/3 of its rice consumption. Lowland areas, where rice is primarily produced, have acid sulfate soils with low pH and potential aluminum and iron toxicity. The goal of this work was to determine if soil amendments can alleviate soil acidity, counteract the negative biogeochemical effects that occur in flooded conditions, and increase rice yield. A two-year experiment was conducted to test the following soil treatments – agricultural lime, pulverized oyster shell, biochar, and control (no amendment) – in flat and raised beds. Plots amended with lime and shell materials had increased soil pH, base saturation, Ca, and cation exchange apacity. Meanwhile, biochar elevated particulate organic matter and C:N ratios. Exchangeable Fe and Al were negatively correlated with soil pH, while Geobacteraceae populations (Fe reducing bacteria) increased with pH. A greater proportion of the total Fe was strongly bound in fractions that were less bioavailable in plots amended with shell or lime, and overall rice yields were significantly higher following amendment with shell or lime. During the second growing year these effects iminished, suggesting that liming effects did not persist as expected. These results demonstrate the benefits of soil amendments that raise soil pH and suggest that this effect operates by influencing overall soil nutrient availability to rice plants, but further research is needed regarding the timing and sustainability of the beneficial liming effect. |
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CT1900009 | P355-DIA | Article scientifique | CRA/Tamba | Dépot numérique | Exclu du prêt |
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European Journal of Soil Biology, vol.57. The Influence of a Shrub-Based Intercropping System on the Soil Nematofauna when Growing Millet in Senegal [texte imprimé] / S Diakhaté, Auteur ; C Villenave, Auteur ; N.H. Diallo, Auteur ; A.O. Ba, Auteur ; D Djigal, Auteur ; Dominique Masse, Auteur ; Mbacké Sembène, Auteur ; L Chapuis-Lardy, Auteur . - 2013 . - pp.35-41: ill. Langues : Anglais ( eng) Catégories : | SCIENCES ET PRODUCTIONS VEGETALES
| Mots-clés : | Piliostigma Réticulatum, Pénnisetum Glaucum, Mil, Arbuste Glaucum, Arbuste Sahélien, Nématodes du Sol, Groupe Trophique, Indices Ecologiques | Index. décimale : | F080-Système et modes culture | Résumé : | Woody shrubs commonly co-exist with annual food crops in farmers’ fields throughout the Sahel.Management strategies that deliberately include the native shrub Piliostigma reticulatum in Senegalese cropping systems result in soil functioning enhancement that benefits to the associated cereal. The objective of this work was to evaluate shrub effect on soil nematode communities. Soil samples were collected from an experimental design where pearl millet (Pennisetum glaucum) was cultivated alone or with P. reticulatum stands and mulch. Soil nematofauna characteristics were determined and compared with results from soil under pure shrub stands and from bare soil. The analysis of soil nematofauna, characterized by the abundance of different trophic groups and related indices (MI, maturity index; EI and SI, enrichment and structure indices), allowed discrimination between treatments with or without shrub presence. The soil nematode community in millet cultivation was dominated by plant feeding nematodes, mainly from the Hoplolaimidae family, but their abundance decreased when P. reticulatum was associated to the cereal. The shrub also impacted other nematode trophic groups. The abundance of opportunistic bacterial feeders (mainly Cephalobidae) was increased in shrub treatments. Furtherresearch should explore consequences on cereal nutrition and nematicidal properties of P. reticulatum. |
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Fiches Techniques ISRA, vol. 48, n°1. Cadre méthodologique pour effectuer des enquêtes chez les producteurs dans la zone cotonnière sénégalaise. [texte imprimé] / F.B.H. Diouf, Auteur ; Mousa Sall, Auteur ; Djiby Dia, Auteur ; Mouhamed Rassoul Sy, Auteur ; Abdou Traoré, Auteur ; Ibrahima Ciss, Auteur ; Djibril Badiane, Auteur ; N.H. Diallo, Auteur ; Amadou Fofana, Auteur . - 2019 . - 5p. : ill. Langues : Français ( fre)
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