Perceptions locales de la manifestation des changements climatiques et mesures d’adaptation dans la gestion de la fertilité des sols dans la Commune de Banikoara au Nord- Bénin

Objectifs: L’étude a pour objectif d’analyser les déterminants biophysiques des changements climatiques et les mesures d’adaptations développées par les producteurs notamment dans la gestion de la fertilité des sols au Nord-Bénin.Méthodologie et Résultats: Les données ont été collectées auprès de focus groupes d’effectif variant de 6 à 12 personnes réalisés dans chacun des dix arrondissements de la Commune de Banikoara. Une enquête auprès de 986 producteurs a été réalisée sur les perceptions, les mesures d’adaptation et les déterminants socio-économiques des changements climatiques. Les données sont analysées avec le test d’indépendance de Χ², l’analyse factorielle des correspondances suivie ou non de la classification ascendante hiérarchique. Ensuite une régression logistique polychotomique ordinale a été utilisée en vue de modéliser la relation entre les déterminants socio-économiques des producteurs enquêtés et le niveau de fertilité de leur sol. Les résultats ont permis d’identifier 24 perceptions liées aux changements climatiques et 63 stratégies d’adaptation. Les stratégies d’adaptation dépendaient des niveaux de prospérité mais n’avaient pas de relation avec l’appartenance aux classes d’âges. Les déterminants socioéconomiques les plus liés à la fertilité des sols sont la location de parcelles, le nombre de charrues et le nombre de charrettes.Conclusion et Application des Résultats: L’amélioration du niveau de prospérité des producteurs est un élément clé de leur adaptation aux changements climatiques. La possession de charrues, de charrettes et la disponibilité des terres sont les déterminants socio-économiques qui expliquent au mieux l’adaptation des producteurs aux changements climatiques dans la gestion de la fertilité des sols.Local perceptions of manifestation of climate change and adaptation measures in the management of soil fertility in the Municipality of Banikoara in North BeninObjectives: The study aims to analyze the biophysical determinants of climate change and adaptation measures developed by such producers in the management of soil fertility in northern Benin.Methodology and Results: Data were collected from focus groups of staff ranging from 6 to 12 people made in each of the ten districts of the Municipality of Banikoara. A survey of 986 farmers was conducted on perceptions, adaptation and socio-economic determinants of climate change. The data were analyzed with the chi-square test of independence, the correspondence analysis or not followed by the hierarchical clustering. Then polychotomous ordinal logistic regression was used to model the relationship between socio-economic determinants of producers surveyed and the fertility of their soil. The results identified 24 perceptions related to climate change and adaptation strategies 63. Adaptation strategies depended on the levels of prosperity but had no relationship with the membership age groups. Socio-economic determinants related to most soil fertility include the rental plots, the number of plows and the number of carts.Conclusion and Application of Results: Improving the level of prosperity of the producers is a key element of their adaptation to climate change. Possession of plows, carts and land availability are the socioeconomic determinants that explain the adaptation of the best producers to climate change in the management of soil fertilit

Les Espèces vègètales de couverture du sol destinées à la culture du coton en semis direct.

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Diagnostique visuel des carences nutritionnelles du cotonnier.

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Cultivation of Cowpea Challenges in West Africa for Food Security: Analysis of Factors Driving Yield Gap in Benin

Feeding the world in 2050 requires us to find ways to boost yields of the main local crops. Among those crops, cowpea is one of the grain legumes that is playing an important role in the livelihood of millions of people in West Africa, especially in Benin. Unfortunately, cowpea on-farm yields are very low. In order to understand the main factors explaining cowpea yield gaps, we collected and analyzed detailed survey data from 298 cowpea fields in Benin during the 2017, 2018 and 2019′s rainy seasons, respectively. Composite soil samples were collected from cowpea fields and analyzed in the laboratory. Data on farm field management practices and field conditions were recorded through interviews with 606 farmers. Average cowpea grain yields were low and seldom surpassed 700 kg ha−1 on farmer’s fields. Significant differences were observed between cowpea grain yields from northern to southern Benin (p < 0.05), and the lowest yields were observed in northern Benin. These low yields are related to crop management practices, soil nutrient contents, and the interaction of both. According to the model of regression tree from northern to southern Benin, the use of mineral fertilizer, insecticide sprays to control pests, and the improvement of phosphorus, nitrogen, potassium (P, N, K) and cation sum content in the topsoil would increase cowpea grain yields. Insect pests, diseases, and soil fertility decline are the largest constraints limiting grain yield in Benin. Future research should focus on formulating site-specific fertilizer recommendations for effective cowpea cultivation in Benin, as well as the control of insect pests and diseases

Soil Fertility Level and Cropping Practices Determining Soybean Yield in Northern East and Center of Benin

Soybean is a food security crop in Benin due to its high nutritional value but its yield in the farmers’ cropping system is very low. The present study aims to provide appropriate response to the yield variability among fields in two agro-ecological zones of Benin namely: Southern Borgou zone (AEZ 3 in the north) and cotton zone of central Benin (AEZ 5). Soil samples were collected from 0-20 cm depth in 120 fields (50 in the AEZ 3 and 70 in the AEZ 5). pH (water), soil organic carbon (Walkley and Black method), total nitrogen (Kjeldahl method), CEC (0.01 N ammonium acetate at pH 7 method) and available phosphorus (Bray 1) were determined in the laboratory of Soil Science Water and Environment (LSSEE) of the National Agricultural Research Institute of Benin (INRAB). Cropping system (crop rotations, soil fertility management practices) were also collected using an open ended questionnaire. Classification and regression trees (CARTs) models were used for data analyses. Soybean yield variability among the agro-ecological zones were registered and the highest yield recorded was less than 1 t.ha-1. Considering soil characteristics, soil organic matter level was the most important variable determining yield variability. Furthermore, quantities of P applied and farmyard manure were cropping practices inducing yield variability (86.4% and 15% of the variability respectively). Our results also show that, yield differences noticed among the agro-ecological zones were induced by CEC and pH (water). The study suggested promotion of integrated soil fertility management practices to sustain soybean yield in the study area

Rhizobacterial inoculation in combination with mineral fertilizer improves maize growth and yield in poor ferruginous soil in Central Benin

The use of biotechnological approaches to increase soil fertility and productivity allows to obtain sustainable agriculture with lesser use of chemical fertilizers. The present study aimed to determine whether the inoculation of Bacillus panthothenicus, Bacillus thuringiensis, Pseudomonas putida, Pseudomonas syringae, or Serratia marcescens combined with reduced doses of NPK (nitrogen, phosphorus, potassium) fertilizer can improve the growth and yield of maize on poor ferruginous soils under field conditions in central Benin. For this purpose, maize seeds of the EVDT 97 STR C1 variety were inoculated with 10 ml suspension of five plant growth-promoting rhizobacteria (PGPR) strains, and the plots were fertilized at seeding with the recommended doses (0, 25, 50, 100%) of 200 kg/ha of NPK and 100 kg of urea for corn cultivation. The study was conducted in a completely randomized design with 3 replicates. The results showed that except for P. syringae , which induced the highest fresh aerial biomass (94.51%) and dry aerial biomass (63.63%), all other parameters were positively improved with inoculation associated with reduced doses of NPK + urea. The best height, leaf area, fresh underground biomass, and grain yield were recorded in response to the application of P. syringae + 50% NPK + urea, with an increase of 26.82, 32.23, 107.57, and 30.64%, respectively, compared to those of the control. The inoculation of seeds with P. syringae + 50% NPK + urea can be considered to be an environmentally sustainable strategy for maize cultivation