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Détail de l'auteur
Auteur Saidou Sall
Documents disponibles écrits par cet auteur
Affiner la rechercheAgronomy journal, Vo l u me 1 0 5 , I s s u e 4. Crop Productivity and Nutrient Dynamics in a Shrub-Based Farming System of the Sahel / E. L Dossa
Agronomy journal, Vo l u me 1 0 5 , I s s u e 4. Crop Productivity and Nutrient Dynamics in a Shrub-Based Farming System of the Sahel [texte imprimé] / E. L Dossa, Auteur ; I. Diedhiou, Auteur ; Mamadou Khouma, Auteur ; M. Sène, Auteur ; A. N. Badiane, Auteur ; Arona Ndiaye Samba Samba, Auteur ; K. B Assigbetsé, Auteur ; Saidou Sall, Auteur ; A. Lufafa, Auteur ; F. Kizito, Auteur ; Richard P. Dick, Auteur ; Jyotisna Saxena, Auteur . - [s.d.] . - 10 p. (1237-1246).
Langues : Anglais (eng)
Catégories : RESSOURCES NATURELLES ET ENVIRONNEMENT Mots-clés : Guiera senegalensis, Fertilisation, Productivité Index. décimale : P355-Fertilisation du sol. Besoins en engrais et amendement. Alimentation minérale des plantes. Réponse des plantes Résumé : Piliostigma reticulatum (DC.) Hochst., an indigenous shrub, forms an important vegetative component of parkland cropping systems in the Sahel; however, its biophysical interactions with soil and crops are not well understood. Therefore, the objectives were to determine the impact of P. reticulatum, under varying fertilizer rates, on crop yield response and soil nutrient dynamics. The experiment had a split-plot factorial design, where the main plot was shrub (presence or absence) and the subplot was fertilizer rate (0, 0.5, 1.0, or 1.5 times the recommended N–P–K fertilizer rate) applied to a peanut (Arachis hypogaea L.)–pearl millet [Pennisetum glaucum (L.) R. Br.] rotation. In 3 of the 4 yr, P. reticulatum improved or had no effect on crop yields when averaged across fertilizer rates. Overall, millet and peanut biomass and N and P uptake by millet increased in the presence of shrubs and with increasing fertilizer rate. Contrary to P, inorganic N in the soils changed very rapidly, reaching very low levels by the end of the growing season. The N content of soil leachates below the rooting zone was generally lower beneath than outside the shrub canopy, suggesting that the shrub conserves N that is otherwise lost through leaching. Piliostigma reticulatum increased particulate organic matter, indicating that this shrub improved soil quality. These results suggest that P. reticulatum, under nonthermal management and a higher density than typically found in farmers’ fields, has ecological benefits with improved soils and reduced loss of N, which has implications throughout the Sahel. Exemplaires
Code-barres Cote Support Localisation Section Disponibilité CN1800030 P355-DOS Publication CNRA/Bambey Rayons Exclu du prêt Documents numériques
Cliquer pour le pdfURL Applied and Environmental Microbiology., vol.75, n°15. Quantification of Key Genes Steering the Microbial Nitrogen Cycle in the Rhizosphere of Sorghum Cultivars in Tropical Agroecosystems. / Brigitte Hai
Applied and Environmental Microbiology., vol.75, n°15. Quantification of Key Genes Steering the Microbial Nitrogen Cycle in the Rhizosphere of Sorghum Cultivars in Tropical Agroecosystems. [texte imprimé] / Brigitte Hai, Auteur ; .N H. Diallo, Auteur ; Saidou Sall, Auteur ; Felix Haesler, Auteur ; Kristina Bonzi Schauss, Auteur ; M.K. Assigbetsé, Auteur ; J.L. Chotte, Auteur ; Jean Charle Munch, Auteur ; Micheal schloter, Auteur . - [S.l.] : Applied and Environmental Microbiology., 2009 . - pp.4993-5000 : ill.
Langues : Anglais (eng)
Catégories : RESSOURCES NATURELLES ET ENVIRONNEMENT Mots-clés : Cycle Géochimique, Sorgho, fertlisation, cultivars, fixation d'azote Index. décimale : P012- Ressources naturelles liées à l'agriculture Résumé : The effect of agricultural management practices on geochemical cycles in moderate ecosystems is by far better understood than in semiarid regions, where fertilizer availability and climatic conditions are less favorable. We studied the impact of different fertilizer regimens in an agricultural long-term observatory in Burkina Faso at three different plant development stages (early leaf development, flowering, and senescence) of sorghum cultivars. Using real-time PCR, we investigated functional microbial communities involved in key processes of the nitrogen cycle (nitrogen fixation, ammonia oxidation, and denitrification) in the rhizosphere. The results indicate that fertilizer treatments and plant development stages combined with environmental factors affected the abundance of the targeted functional genes in the rhizosphere. While nitrogen-fixing populations dominated the investigated communities when organic fertilizers (manure and straw) were applied, their numbers were comparatively reduced in urea-treated plots. In contrast, ammonia-oxidizing bacteria (AOB) increased not only in absolute numbers but also in relation to the other bacterial groups investigated in the urea-amended plots. Ammonia-oxidizing archaea exhibited higher numbers compared to AOB independent of fertilizer application. Similarly, denitrifiers were also more abundant in the urea-treated plots. Our data imply as well that, more than in moderate regions, water availability might shape microbial communities in the rhizosphere, since low gene abundance data were obtained for all tested genes at the flowering stage, when water availability was very limited. Exemplaires
Code-barres Cote Support Localisation Section Disponibilité CT1900004 P012- HAI Article scientifique CRA/Tamba Dépot numérique Exclu du prêt Documents numériques
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