La dégradation des sols résultants des facteurs climatiques et anthropiques constitue l’un des problèmes majeurs de l’agriculture au Niger. En réponse à ce phénomène, les agroécosystèmes s’adaptent à travers la mise en oeuvre des techniques de gestion intégrée des eaux et des sols dont notamment le reboisement des terres dégradées. C’est ainsi que cette étude a été menée avec pour objectif de caractériser le sol dégradé du site de Sakey koira Tegui en vue d’un meilleur reboisement avec Acacia senegal. A cet effet, des profils pédologiques ont été ouverts et décrits suivant la topo-séquence du site. Des échantillons de sol ont été prélevés au niveau de chaque profil et analysés au laboratoire. Les résultats ont montré que la texture de sols est de type sableuse (72,32%) et limoneuse (45%). Quant aux caractéristiques chimiques des sols, le pH est acide variant de 5,1 à 5,53 sur l’ensemble des horizons avec une conductivité électrique de l’ordre de 13, 00 à 33, 00 μs/cm. Ces résultats montrent que ce sol de faible fertilité chimique, avec une prédominance sableuse pourrait être récupéré et reboisé avec Acacia senegal, sol de prédilection de cette espèce. Mots clés : caractéristiques chimiques, textures, terres dégradées, Acacia senegal, Niger.   English Title: Soil characterization of the degraded site of Sakey koira Tegui in Niger for better reforestation with Acacia senegalSoil degradation resulting from climatic and anthropogenic factors is one of the major problems of agriculture in Niger. In response to this phenomenon, agro-ecosystems are adapting through the implementation of integrated water and soil management techniques, including reforestation of degraded land. Thus, this study was conducted with the objective of characterizing the degraded soil of the Sakey koira Tegui site for better reforestation with Acacia senegal. To this end, soil profiles were opened and described according to the topo-sequence of the site. Soil samples were taken from each profile and analysed in the laboratory. The results showed that the soil texture is sandy (72.32%) and silty (45%). As for the chemical characteristics of the soils, the pH is acidic ranging from 5.1 to 5.53 over all horizons with an electrical conductivity of 13.00 to 33.00 μs/cm. These results show that this soil of low chemical fertility, with a sandy predominance, could be recovered and reforested with Acacia senegal, the soil of predilection of this species.Keywords: Chemical characteristics, textures, degraded soils, Acacia senegal, Niger.

AIM: Assessment of various fertilizers type effects on rice productivity in Niger. Study Design: The experiment was laid by using a complete randomized block design with different types of fertilizers and was replicated four times. Place and Duration of Study: The field experiment was conducted during the dry and wet season of 2020 on the irrigated perimeter of Toula (Niger). Methodology: The experiment was performed with four treatments in complete randomized blocks. The treatments applied are: T1=Bokashi, T2=Compost, T3=Biochar and T4=NPK-Urea. The monitored parameters were the rice plant development cycle and agronomic characteristics. Observations of the crop evolution during the experimentation were recorded at regular intervals. The significance of treatment impact was examined by the statistical test.  Results: The results showed that bio-fertilizers had significant effects on 1000 grain weight and the length of the vegetative cycle. As for the chemical treatments, the effects were significant on most of the rice growth parameters (height, number of grains per panicle, number of tillers per rice plant) as well as on paddy and feed biomass yield. These results also showed a positive correlation between rice growth parameters and yield irrespective of the type of treatment.

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