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Détail de l'auteur
Auteur K. B Assigbetsé
Documents disponibles écrits par cet auteur
Affiner la rechercheThe rhizosphere biology of native shrub-based cropping systems: An unrecognized potential to optimize crop production in the Sahel / L. C. Lardy
The rhizosphere biology of native shrub-based cropping systems: An unrecognized potential to optimize crop production in the Sahel [texte imprimé] / L. C. Lardy, Auteur ; Ndèye Yacine Badiane Ndour, Auteur ; S. J. Debenport, Auteur ; Brian B. M. Gardener, Auteur ; K. B Assigbetsé, Auteur ; Mathew B. H. Bright, Auteur ; P Schreiner, Auteur ; Hassna Founoune Mboup, Auteur ; I. Diedhiou, Auteur ; .N H. Diallo, Auteur ; R Bayala, Auteur ; R. P. Dick, Auteur . - Dakar (Sénégal) : ISRA/LNRPV, 2014 . - 05p.
Langues : Anglais (eng)Exemplaires
Code-barres Cote Support Localisation Section Disponibilité PV1700031 P355-LAR Article scientifique LNRPV Rayons Exclu du prêt Documents numériques
Cliquer pour voir pdfURL 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 / 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 Plant soil, N° 327. Spatial patterns of P fractions and chemical properties in soils of two native shrub communities in Senegal / E. L Dossa ; S. Diedhiou ; J. E. Compton ; K. B Assigbetsé ; Richard P. Dick
Plant soil, N° 327. Spatial patterns of P fractions and chemical properties in soils of two native shrub communities in Senegal [texte imprimé] / E. L Dossa, Auteur ; S. Diedhiou, Auteur ; J. E. Compton, Auteur ; K. B Assigbetsé, Auteur ; Richard P. Dick, Auteur . - [s.d.] . - 14 p. (185–198).
Langues : Anglais (eng)
Catégories : RESSOURCES NATURELLES ET ENVIRONNEMENT Mots-clés : Sol de canopée, Fractions P, Sahel Semi-aride, Arbuste, Piliostigma reticulatum, Guiera senegalensis Index. décimale : P340-Biologie et biochimie du sol Résumé : Two shrub species (Piliostigma reticulatum (D.C.) Hochst (Caesalpinioideae) and Guiera senegalensis J.F. Gmel (Combretaceae) are commonly found in farmers’ fields at varying densities in semi-arid Senegal and throughout the Sahel where soils have chronically low phosphorus (P) availability. It seems plausible that shrub litter and the rhizospheres could influence P fractions and other chemical soil properties that affect crop productivity. Thus, a study was done at two sites, on the distribution of inorganic and organic soil P pools, organic C levels, and pH in soil beneath and outside the canopies of P. reticulatum and G. senegalensis (0-30 cm depth). Both sites had low total P ranging from 64 mg P kg−1 to 135 mg P kg-1, and low extractable PO4 (resin Pi) (1–6 mg P kg−1) with P fractions dominated by NaOH-P. Organic P (Po) made up about 50% of total P, and most of the organic P (>60%) was found in the NaOH-P fractions. The labile P, particularly bicarb-Po was higher in soil beneath shrub canopies (8.4 mg P kg −1), than outside the canopy (6.2 mg P kg −1). Similarly, C, N and P to a lesser extent, were more concentrated beneath shrub canopies. P. reticulatum soil was dominated by the NaOH-Po fraction, whereas G. senegalensis had higher bicarb-Po at one of the study sites. An index of biologically available organic P (Bicarb- Po) / (Bicarb-Po+Bicar-Pi+Resin Pi) was >60% and indicates that biological processes represent an important part of P cycling in these shrub ecosystems. The differential ability of shrubs in modifying soil chemical properties under their canopies has major implications for biogeochemical cycling of nutrients and C in sandy soils of semi arid Sahelian ecosystems. Exemplaires
Code-barres Cote Support Localisation Section Disponibilité CN1800035 P340-DOS Publication CNRA/Bambey Rayons Exclu du prêt Documents numériques
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