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Série European Journal of Soil Biology
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European Journal of Soil Biology. 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 ; P. M. Sembene, Auteur ; L. C. Lardy, Auteur . - Dakar (Sénégal) : ISRA/LNRPV, 2013 . - 08p. : ref,;tabl. Langues : Anglais ( eng)
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PV1700041 | H100-DIA | Article scientifique | LNRPV | Rayons | 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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CT1900008 | F080-DIA | Article scientifique | CRA/Tamba | Dépot numérique | Exclu du prêt |
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European Journal of Soil Biology, vol.75. Effects of residue quality and soil mineral N on microbial activities and soil aggregation in a tropical sandy soil in Senegal [texte imprimé] / S. N. Sall, Auteur ; Dominique Masse, Auteur ; N. H. Diallo, Auteur ; Thierno M.B. Sow, Auteur ; E Hien, Auteur ; A Guissé, Auteur . - 2016 . - pp.62-69; ill. Langues : Anglais ( eng) Catégories : | RESSOURCES NATURELLES ET ENVIRONNEMENT
| Mots-clés : | Qualité des résidus, Minéral , agrégation , sol sableux | Index. décimale : | P332-Physique et mécanique du sol : propriétés physiques du sol ; mécanique et structure du sol | Résumé : | The role played by organic residues and exogenous mineral N in the formation of stable soil aggregates in nutrient-poor, tropical sandy soils of Senegal is relatively unclear. This study assessed the effect of two representative low and high quality residues (Zea mays and Crotalaria retusa respectively) on the formation and stability of soil aggregates. The formation and stability of aggregates, soil biomass, root biomass, fungal hyphae length, C mineralization and chitinase activity, as a specific biomarker of the activity of fungal populations, were measured under controlled conditions over 120 days. In both the
control and amended soils, there were more macroaggregates (>2000 mm) and mesoaggregates (250 e2000 mm) than microaggregates (50e250 mm and <50 mm). The formation of macroaggregates and stability (MWD) were not significantly affected by the quality of residues. Amendment with organic residues shifted the distribution of the aggregate fractions. The macroaggregates increased by 26% with crotalaria and by 35% with maize residues while mesoaggregates decreased by 18% with crotalaria and by 26% with maize residues and microaggregates decreased by 8% with crotalaria and by 9% with maize residues. This study also onfirmed that macroaggregates are formed from micro- and mesoaggregates. The total microbial biomass was significantly higher in soil amended with maize residues compared to oil with crotalaria residues and the control soil although the fungal hyphae length decreased when the soil was amended with either crop residue. Chitinase activity is the most pertinent indicator associated with acroaggregation stability. Adding mineral N (equivalent to 120 kg N ha1 as urea) to the residue increased microbial biomass and reduced fungal hyphae length but had no effect on macroaggregate formation and fungal activity. These observations suggested that, for short term incubation of soil amended with residues, fungal activity plays a greater role in aggregation in sandy soils than the fungal population density. |
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CT1900010 | P332-SAL | Article scientifique | CRA/Tamba | Dépot numérique | Exclu du prêt |
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