AURIFERE
PORTAIL DOCUMENTAIRE DE L'INSTITUT SENEGALAIS DE RECHERCHES AGRICOLES
Elaboré par
L’Unité d’Information et de Valorisation des Résultats de la Recherche (UNIVAL)
'Un Accès Unique aux Ressources d’Information et aux Fonds documentaires pour une Recherche d’Excellence '
A partir de cette page vous pouvez :
Retourner au premier écran avec les dernières notices... |
Détail de la série
Série Agronomy journal
Documents disponibles dans cette série
Agronomy journal, Vo l u me 1 0 4 , I s s u e 5. Crop Productivity and Nutrient Dynamics in a Shrub (Guiera senegalensis)–Based Farming System of the Sahel / E. L Dossa
Agronomy journal, Vo l u me 1 0 4 , I s s u e 5. Crop Productivity and Nutrient Dynamics in a Shrub (Guiera senegalensis)–Based Farming System of the Sahel [texte imprimé] / E. L Dossa, Auteur ; I. Diedhiou, Auteur ; Mamadou Khouma, Auteur ; M. Sène, Auteur ; A. Lufafa, Auteur ; F. Kizito, Auteur ; Arona Ndiaye Samba Samba, Auteur ; A. N. Badiane, Auteur ; Richard P. Dick, Auteur . - [s.d.] . - 10 p. (1255-1264).
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 : The indigenous shrub, Guiera senegalensis, coexists with crops to varying degrees in farmers’ fields throughout the Sahel, with little known about its biophysical and ecological interactions with soils and crops. Therefore, the objectives were to determine the effect of the presence or absence of shrubs under varying rates of fertilizer on: (i) crop growth and yield, and (ii) soil nutrient dynamics. An experiment from 2004 to 2007 was conducted in northern Senegal where G. senegalensis dominates that had a split-plot factorial design. The presence or absence of G. senegalensis was the main plot and fertilizer rate (0, 0.5, 1 or 1.5 times the recommended N–P–K rate) was the subplot in a peanut (Arachis hypogaea L.)–pearl millet [Pennisetum glaucum (L.) R. Br.] rotation. Averaging over fertilizer rate showed that G. senegalensis had significantly greater crop biomass and yields than no shrub plots (P < 0.05) for all 4 yr. This crop yield response was related to improved nutrient availability (significantly greater for crop N and P uptake in the presence than absence of shrubs in zero fertilizer plots), higher soil quality (elevated particulate organic matter (POM) with shrubs, and a significant correlation of POM with millet yield). Lysimeters below the crop rooting zone had inorganic N levels that were not significantly affected by shrubs compared to no shrub plots, which was attributed to
high variability. Combining the ecological potential to restore degraded landscapes with the agronomic benefits demonstrated here, shows that optimized G. senegalensis–crop systems should be further investigated in farmers’ fields throughout the Sahel.Exemplaires
Code-barres Cote Support Localisation Section Disponibilité CN1800026 P355-DOS Publication CNRA/Bambey Rayons Exclu du prêt Documents numériques
Cliquer pour le 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