Sedimentation of small reservoirs is a critical factor in the degradation of land and water resources in the Sudano-Sahelian zone. Such infrastructure underpins agricultural resilience and rural livelihoods. This study used an integrated granulometric, morphometric, and spatial analysis to evaluate sediment accumulation in the Toukomtoré reservoir in Koubri, central Burkina Faso, and to inform degraded land management strategies. Ten sediment cores (maximum depth: 1.50 m) were collected along transects spanning the upstream-downstream and center-periphery axes. Thirty samples were analyzed for particle size distribution, and key parameters such as the Hazen uniformity coefficient (Cu) and the classification coefficient (Cc) were computed. Spatial interpolation was performed using QGIS, and statistical analyses were performed using R 4.4.3. The results indicate a mean sediment deposition of 90 cm, peaking at 119 cm in the upstream and central zones, which are dominated by sand (64%-80%). Subsurface layers are predominantly sandy (80%), while surface horizons show enrichment of silt and clay, indicating recent deposition. The bulk density ranged from 1.55 to 1.63 g/cm³. Critical degradation drivers include a steep watershed slope of 10.5 m/km, sparse vegetation, unsustainable tillage practices, and the absence of soil conservation structures. This sedimentation process severely reduces reservoir storage capacity and accelerates land degradation. To mitigate erosion and prolong infrastructure lifespan, this study recommends integrated watershed interventions, including vegetative buffers, check dams, and agroforestry. This study provides policymakers who manage small reservoirs in semi-arid, degraded landscapes with actionable data.

Description of the subject. Irrigation represents an important lever to improve food security and agricultural productivity, especially in the arid contexts of Burkina Faso. Objectives. This study aims to evaluate the effectiveness of fired clay jars as a sub-irrigation system for onion cultivation in Burkina Faso. Method. Soil analysis was carried out to determine the main physico-chemical parameters. A total of nine jars were buried, and their exudation flow rates were measured at regular intervals. Moisture sensors were installed around the jars where onion plants were grown. The height of the plants and the number of leaves per plant were monitored over a three-week period. Descriptive statistical analyses, complemented by a principal component analysis (PCA), were performed to identify general trends and highlight the underlying structure of the data. Results. Soil analysis showed a coarse texture, sandy-loam type, indicating good drainage capacity but low water retention capacity. The pH values ranged from slightly acidic to neutral, favorable for nutrient availability in the soil. Bulk densities ranged between 1.54 and 1.56 g.cm(-3), while organic matter content remained relatively low in soil profile no. 2 (0.19%) compared to profiles no. 1 (0.61%) and no. 3 (0.812%). The experiments carried out under soilless conditions revealed contrasting relationships between the measured flow rates, reflecting differing performance levels among the jars. Flow rate measurements of the jars ranged from 0.08 l.h(-1) to 0.14 l.h(-1), with an average rate of 0.112 l.h(-1). PCA revealed that the optimal moisture rate around the jar is located at a maximum of 20 cm within a soil depth not exceeding 30 cm. Joint analysis of plant height and number of onion leaves suggested relatively linear growth, positively correlated. Conclusions. The results of our study highlighted the effectiveness of fired clay jars for sub-irrigation of onion crops, as being a low-tech local technique suitable for smallholder farmers and potentially contributing to the implementation of sustainable solutions.

Declining agricultural fertility represent a major challenge to food security in the Sudano-Sahelian areas. In this context, it is essential to cultivate resilient cereals, such as sorghum, whose productivity depends heavily on the physical, chemical, and biological properties of the soil. This study aims to assess soil chemical fertility in order to improve soil management and optimize sorghum production. The spatial distribution of soils was determined using a Digital Elevation Model (DEM) from the ALOS PALSAR radar, with a spatial resolution of 12.5 meters. Soil data were analyzed using R software, applying descriptive statistics and principal component analysis (PCA). The soil prospecting identified three subgroups of soils: Haplic Cambisols located on the upper slope of the glacis, Ferric Lixisols on medium slopes and Gleyic Lixisols at the bottom of the glacis. Soil texture analysis showed a dominance of sandy fractions, varying from sandy-loam to sandy-clay, characteristic of soils in the Sudano-Sahelian zone. A gradient of organic matter, higher in brown soils (1.11%), compared to ferruginous soils (0.59%) and hydromorphic soils (0.40%). A strong positive correlation was observed between organic matter, nitrogen and phosphorus, suggesting that improving OM could increase soil fertility. Low N (0.013–0.099%) and P (2.17–7.81 mg/kg) contents reveal significant nutritional limitations for agricultural productivity. OM, N, and P contents are mainly concentrated in the surface horizons. Although classified as medium, the fertility of all soil types studied varies depending on the topography. These results highlight the importance of knowledge of fertility parameters and the need for differentiated management of soils according to their agronomic suitability.

Degradation of cultivated soils limits agricultural productivity and soil fertility. In Burkina Faso, the effect of soil type variability on cropping systems remains poorly documented, deserving further investigation. This study tests the effect of soil variability on sorghum-cowpea cropping system agronomic performance, with and without NPK fertilization. Two soil types (Lixisols and Cambisols) were tested at two fertilization levels (0 and 100% NPK) in a greenhouse using a split-plot design in vegetation pots. The agromorphological parameters of sorghum and cowpea were evaluated. Cambisols improve sorghum and cowpea agronomic performance more than Lixisols. Adding 100% NPK stimulates cowpea production (+40% and +15% above-ground and root biomass, respectively). In sole crop, Cambisols also improve sorghum above-ground biomass compared to Lixisols (+13% and +4%, respectively). Our results show that the recommended 100 kg.ha-1 of NPK mineral fertilizer dose is not conducive to good cowpea root biomass in our sorghum-cowpea intercropping systems, as it is probably too high compared to the starter dose for cowpea in Lixisols. Thus, Cambisols could be a more competitive choice to obtain superior agronomic performance in terms of yield and crop quality (sorghum-cowpea).

In Burkina Faso, okra is one of the most important vegetable crops. Low soil fertility is one of the major constraints to okra production. The objective of this study was to evaluate the effect of mixed bovine and ovine stabling on soil properties and on growth and yield of okra in Sudano-Sahelian zone. The study was conducted during the 2023-2024 agricultural season. The experiment design used is a Randomized Complete Block Design with two treatments (with and without stabling) and four replications. The data collected are plant height, collar diameter, number of leaves, number of flowers, soil temperature and soil pH. Results of the study showed that the stabling treatment (PR) recorded the highest pH (6.27), the highest fruit weight (137.62 g plant-1) and the best fruit yield (2.75 t ha⁻¹), i.e. a yield gain of 17.62% compared to the control (TA). These results highlight that mixed cattle and sheep stabling, a source of organic matter, improves the soil and okra productivity. Thus, the practice of stabling could be an alternative to restore the soil and boost okra production in the Sudano-Sahelian zone of Burkina Faso.

Description of the subject. Irrigation represents an important lever to improve food security and agricultural productivity, especially in the arid contexts of Burkina Faso. Objectives. This study aims to evaluate the effectiveness of fired clay jars as a sub-irrigation system for onion cultivation in Burkina Faso. Method. Soil analysis was carried out to determine the main physico-chemical parameters. A total of nine jars were buried, and their exudation flow rates were measured at regular intervals. Moisture sensors were installed around the jars where onion plants were grown. The height of the plants and the number of leaves per plant were monitored over time. Descriptive statistics and a principal component analysis (PCA) were performed to explore the trends and underlying data structures. Results. Soil analysis showed a coarse texture, sandy-loam type, indicating good drainage capacity but low water retention capacity. The pH values ranged from slightly acidic to neutral, favorable for nutrient availability in the soil. Bulk densities ranged between 1.54 and 1.56 g·cm-³, while organic matter content remained relatively low in soil profile no. 2 (0.19%) compared to profiles no. 1 (0.61%) and no. 3 (0.812%). Performance tests of the jars in soilless conditions revealed varied relationships between measured flow rates, indicating differing performance levels. Flow rate measurements of the jars ranged from 0.08 l·h-1 to 0.14 l·h-1, with an average rate of 0.112 l·h-1. PCA revealed that the optimal moisture rate around the jar is located at a maximum of 20 cm within a soil depth not exceeding 30 cm. Joint analysis of plant height and number of onion leaves suggested relatively linear growth, positively correlated. Conclusions. The results of our study highlighted the effectiveness of fired clay jars for sub-irrigation of onion crops, as being a low-tech local technique suitable for smallholder farmers and potentially contributing to the implementation of sustainable irrigation solutions.

This study assessed the effects of stone-rows spacing on soil fertility and the potential for a fertility gradient to occur in a farming setting. The study was conducted in a rural area of Sampieri, eastern Burkina Faso, within a Sudano-Sahelian environment on Lixisols with a medium slope of up to 5%. The experimental design included three plots, each with a different stone-rows spacing: 15.5 m (P1), 18.5 m (P2) and 22 m (P3). Soil samples were taken at depths of 0-10 and 10-20 cm, with interval ranging from 0 to 15 m from the rows. Soil organic carbon(C), total nitrogen (N), pH and soil microbiological activity were measured. The study showed that C, N, P and pH levels improved more on plots P2 and P1 than on plot P3. Although differences were noted for microbiology, they were not statistically significant. A correlation was found and most soil fertility parameters. However, no soil fertility gradient was evident as a function of slope when moving away from the first stone-rows line. It can be concluded that the optimal spacing between stone-rows is 18.5 m and that it is difficult to deduce a fertility gradient within this interval. However, further research is needed for validation and confirmation of these findings.

In Burkina Faso, maize (Zea mays L.) is the second most cultivated cereal. However, yields remain low due to the decline in soil fertility inherent to several factors. This study was carried out in order to valorize compost and quail droppings in maize production. It was carried out in a greenhouse vegetation vase at French Research Institute for Sustainable Development in Ouagadougou. The methodology used was based on a randomized block agronomic trial with 04 treatments repeated 5 times. The trial consisted of comparing compost (3 t ha-1), quail droppings (3 t ha-1) and NPK (14-23-14-3B-1S) (200 kg ha-1) with a control. The chemical and biological parameters of the soil after harvest and the production of maize biomass were measured. The results showed that soil amendment with compost significantly increases (P = 0.006) biomass production (125.44 ± 17.13 g) compared to NPK. Compost-treated soils significantly (P = 0.0001) improved plant height (101.22 ± 8.34 cm) and number of ears per plant (0.67 ± 0.14) compared with other treatments. Plant diameter was significantly (P = 0.0001) increased under quail droppings (13.67 ± 0.51 mm). The soil treated with quail droppings improved microbial life with increased CO2 release (2715 ± 648.81 ppm) throughout the incubation period compared with the other treatments. The quail droppings amendment provided more soil organic carbon and nutrients that were easily mineralized and assimilated by plants. At result, the quail droppings improve soil biological and chemical activities or the compost increase maize biomass yield.

En contexte de bas-fonds sud-soudaniens, la faible productivité agricole due à une connaissance insuffisante des caractéristiques intrinsèques des sols, est un problème crucial. En effet, les statuts organique et nutritionnel des sols dans cette zone restent fortement influencés par la typologie des sols et le relief. Ainsi, l'objectif de cette étude est d’évaluer l’influence combinée de la diversité des sols et de leur position topographique sur l’activité microbienne et le cycle du carbone. L’étude a été menée sur des sols du bas-fond de Lofing dans le Sud-Ouest du Burkina Faso. Une caractérisation morpho-pédologique de la zone étudiée selon le système français et son correspondant selon WRB, 2015 a mis en évidence des sols bruns eutrophes (Vertic Cambisol), couvrant 56,29% du bas-fond. Le deuxième type concerne les sols hydromorphes peu humifères (Haplic Gleysol) couvrant 40,85% du bas-fond. Les analyses des échantillons de sols de subsurface (0-10 cm) ont montré des valeurs plus élevées en carbone total (+29%) et minéralisable (+22%), ainsi qu’en quotient métabolique (+29%) et en respiration microbienne (+36%) dans les sols hydromorphes par rapport aux sols bruns. En revanche, c’est dans les sols bruns que la biomasse et le rendement microbiens ont été plus élevés (+22% et +69%, respectivement). Il ressort de cette étude que la fraction labile de carbone et l’activité des microorganismes des sols sont fortement influencées par les apports organiques colluviaux et le niveau topographique. Ainsi, l'interaction entre la nature du sol et le niveau topographique apparaît comme un facteur clé dans l’évaluation du cycle du carbone organique des sols en contexte de bas-fonds sud-soudaniens. In the lowlands of the Sudanian climate of Burkina Faso, low crop productivity due to inadequate knowledge of the intrinsic characteristics of soils is a crucial problem. The aim of this study was to determine the influence of soil diversity and topographical position on the combined efficiency of microbial activity and the carbon cycle. The study was carried out in the Lofing lowland (south-west of Burkina Faso). A morpho-pedological characterisation of the study area according to the French system (and its correspondent according to WRB, 2015) revealed eutrophic Brown soils (Vertic Cambisols), covering 56.29% of the lowland. The second type concerns hydromorphic soils with low humus content (haplic Gleysols) covering 40.85% of the lowland. The results of analyses of subsurface soil samples (0-10 cm) showed higher values for total carbon (+29%) and mineralisable carbon (+22%), metabolic quotient (+29%) and microbial respiration (+36%) in hydromorphic soils compared with brown soils. On the other hand, it was in brown soils that microbial biomass and yield were greater (+22% and +69%, respectively). This study shows that the labile fraction of carbon and the activity of soil microorganisms are strongly influenced by colluvial organic inputs and topography. Thus, the interaction between soil type and topography is a key factor in assessing the soil organic carbon cycle in the lowlands of Sudanian climate of Burkina Faso.

In West African agro-ecosystems, soils are inherently low in soil organic carbon decreasing the capacity of soils to sustain crop productivity. Woody Residues instead of being burnt or exported out of the cropping systems, can be managed to optimize soil organic carbon build-up, nutrient cycling and crop productivity. The aim of this study was to determine the effect of woody residue amendments from Piliostigma reticulatum (D.C.) Hochst associated with sorghum-cowpea intercropping on the soil residual property and crop productivity. The investigation was carried out in two experimental sites in the Sudano-Sahelian (Gampela and Kulungu) area of Burkina Faso (West Africa). The experimental design was organized into four replicates consisting of two treatments of woody residue amendments: amended (WR+) and unamended (WR-) soils. The results for both sites showed an overall significant increase in numbers (+ 35%) and biomass (+ 64%) of cowpea nodules. The root and aerial biomasses at the flowering stage of cowpeas were significantly improved in amended soils (WR+) by 26% and 44%, respectively compared to unamended soils (WR-). In addition, the WR+ treatment increase significantly cowpea and sorghum yields by 41% and 25%, respectively, as well as water use efficiency (+ 40% and + 26%, respectively) compared to the WR- treatment. Moreover, our results exhibited a strong correlation (r = 0,95) between cowpea nodular biomass and sorghum grain yields, reflecting more contribution of cowpea ecosystem services (facilitation and complementarity) for associated sorghum productivity. However, despite favorable soil conditions (soil water and organic carbon content) that occurred by WR input, it was not sufficient to improve soil residual total nitrogen and available phosphorus. The woody residue management associated with cereal-legume intercropping is a promising option to sustain crop productivity in Sahelian agro-ecosystems.

Les connaissances empiriques de la nature des sols sont des contraintes pour la mise en valeur optimale de la ressource sol au sein des petites exploitations familiales du Burkina Faso. Ainsi, pour une meilleure valorisation sectorielle du potentiel des sols, la présente étude a consisté à la caractérisation et à l’évaluation de l’aptitude culturale d’un sol pour la production de tomate. Le sol a été ainsi caractérisé selon les directives de la FAO (1994) et son aptitude culturale déterminée selon le manuel d’évaluation des terres du Bureau National des Sols (BUNASOLS, 1990). Les résultats des travaux révèlent que le sol est de type ferrugineux tropical lessivé induré profond et correspond à un Lixisol endoplinthique. Sur le plan physique, la structure est polyédrique subangulaire faiblement développée en éléments grossiers, fins et moyens dans le premier horizon et massive dans l’horizon sous-. La texture du sol est limoneuse en surface, limono-argileuse dans la partie médiane et argileuse en profondeur. Sur le plan chimique, ce sol est caractérisé de l’horizon supérieur à celui inférieur par un rapport C/N de 7, un pHH2O moyennement acide de 6 à 5,7 ; une capacité d’échange cationique de 8,62 à 8,15 méq/100 de sol. En référence aux normes d’interprétation du BUNASOLS (1990), la valeur de la capacité d’échange cationique du sol est basse car comprise entre 5 et 10 méq/100 g de sol. En comparaison avec les exigences de la culture de la tomate, le sol présente des carences physiques liés à une mauvaise condition d’enracinement du fait de la profondeur effective limitée, la texture argileuse en profondeur limitant la pénétration et la colonisation des racines des plantes de tomate. Aussi, le sol est déficient en éléments nutritifs en raison de la basse valeur de la capacité d’échange cationique. Il découle ainsi de l’évaluation que le sol a une aptitude moyenne (S2nr) pour la culture de la tomate. Empirical knowledge of the nature of soils is a constraint to the optimal use of soil resources on small family farms in Burkina Faso. With a view to making better use of soil potential by sector, this study involved characterizing and assessing the suitability of soil for tomato production. The soil was characterized in accordance with FAO guidelines (1994), and its suitability for cultivation was determined in accordance with the Bureau National des Sols land evaluation manual (BUNASOLS, 1990). The results of the work reveal that the soil is of the deep indurated leached tropical ferruginous type and corresponds to an endolithic Lixisol. Physically, the structure is subangular polyhedral, with coarse, fine, and medium elements in the first horizon and massive elements in the sub-horizon. Soil texture is silty on the surface, silty-clayey in the middle, and clayey at depth. Chemically, the soil is characterized from the upper to the lower horizon by a C/N ratio of 7; a moderately acidic pHH2O of 6 to 5.7; a cation exchange capacity of 8.62 to 8.15 meq/100g soil; and a sum of exchangeable bases of 4.59 to 6.13 meq/100g soil. In reference to the BUNASOLS (1990) interpretation standards, the cation exchange capacity of soil value is low, ranging from 5 to 10 meq/100 g of soil. Compared with the requirements of tomato cultivation, the soil shows physical deficiencies linked to poor rooting conditions due to the limited effective depth, with the deep clay texture limiting the penetration and colonization of tomato plant roots. The soil is also deficient in nutrients due to its low cation exchange capacity. As a result of this assessment, the soil has an average suitability (S2nr) for tomato cultivation.

The food supply has grown steadily over the years, while production has been hampered by the increased use of synthetic fertilizers, leading to pollution and degradation of soil physico-chemical properties. It is imperative to advocate for the promotion of sustainable farming techniques that can enhance crop yields while improving soil fertility, without the excessive utilisation of chemical fertilizers. Hence the interest of this study, which involved the use of organic compost enriched or not with Trichoderma Harzianum spores as an alternative method to assess their effect on the physico-chemical soil and agronomic parameters of the « TGX 1910-14F » soybean variety being tested in a greenhouse growing vase. The study was carried out at the Institute of Research Development (IRD) in Ouagadougou (Burkina Faso), on a completely randomized block trial with four fertilization regimes repeated five times. The trial consisted of comparing soil parameters and soybean yields under four fertilization regimes: T1 (1 l m-3 of Trichoderma harzianum spores); T2 (3 t ha-1 of compost); T3 (3 t ha-1 of compost + 1 l m-3 of Trichoderma harzianum spores), T0 (absolute control with no inputs). 4 kg of fine soil from a lixisol and sieved to 2 mm with a field capacity moisture of 150 ml kg-1 of soil were added to each fertilization regime. The results showed that T2 and T3 fertilization regimes improved the organic status, total N, P and K content, absorbable P and available P of the soils. T3 significantly (P < 0.001) increased plant height (146.80 ± 9.92 cm) and the number of soybean plant leaves (46.20 ± 2.41) compared with treatments T0 and T1. T0 and T1 fertilization regimes significantly increased (P < 0.001) the number and weight of soybean nodules compared with T2 and T3. Total soybean biomass was significantly improved (P < 0.001) under T2 and T3 compared with T1 and T0. Thus, the T2 and T3 fertilization regimes was more effective in improving soil fertility and soybean biomass production. The input of Trichoderma harzianum (T1) and fine soil with no inputs (T0) stimulated nodulation of soybean, while compost combined with Trichoderma harzianum spores (T2 et T3) had an effect on vegetative growth. It may be posited that the latter treatment could serve as an alternative means of improving soil fertility and increasing soybean yields.

This study consisted to evaluate the effects of ecological practices on the yield performance of the JEWEL of orange-fleshed sweet potato (Ipomoea batatas (L.) Lam).The study was conducted in a Sudano-Sahelian cropping system (Lantargou, eastern region of Burkina Faso).Agro-ecological practices consisted of the inputs of 3.20 t/ha of compost + 2.45 t/ha of wood ash (CO + WA); 4.90 t/ha of wood ash (WA); 6.40 t/ha of compost (CO) were compared to control with no inputs (T 0 ).Each treatment was repeated four times.The crop management consisted of plowing, harrowing, raising of ridges with 40 cm height, burying of treatments, transplanting of cuttings, two weeding's, and using of biopesticide called PIOL for crop protection.Composite soil samples per treatment were also collected at tuber harvest and analyzed to determine the effects of treatments on residual soil fertility.Results showed that the plant heights and diameters under the CO were significantly (P < 0.001) improved by 16% and 12% compared to T 0 .The WA treatment significantly increased the number of large tubers by 43% (P ≤ 0.01) compared to T 0 .Total tuber numbers, large tuber numbers and tuber yields of sweet potato under CO + WA were significantly (P < 0.001) and respectively improved by 27%, 50% and 31% compared to T 0 .All treatments increased soil organic matter, N, P and K contents, and reduced soil acidity compared with those How to cite this paper:

Termites and earthworms are the main groups of invertebrates in dry tropical ecosystems and exert significant effects on bioturbation and soil reorganization. The dynamics of microbial communities, enzymes and substrates associated with the flux of energy and nutrients induced by their diverse biogenic structures are still under-investigated in agroecological-based cropping systems. The objective of this study was to determine whether the biogenic structures produced by a grass-woody forager termite (Nasutitermes torquatus) and an endogeic earthworm (Millsonia inermis) shift soil organic C (OC), nutrients, enzyme activities and microbial communities in soils amended with woody residues. The experiment was a randomized block design conducted in a Sudano-Sahelian cropping system that was amended annually with woody residues (3 Mg ha(-1)) or not amended (control soils) for six consecutive years. Samples were taken from fresh sheetings and casts (produced respectively by N. torquatus and M. inermis) and bulk soils in amended plots as well as from control soils in nonamended plots. Samples were analyzed for soil texture, OC, total nitrogen (N), available phosphorus (P), pH, enzyme activity and microbial composition. The results showed that sheetings and casts altered soil biochemical properties significantly. Sheetings and casts were remarkably enriched in OC (45-55% and 82-94%, respectively) and P (20-55% and 73-130%) compared to bulk soils and control soils. Sheetings and casts substantially stimulated beta-glucosi-dase (153-178% and 158-183%, respectively) and N-acetyl-beta-glucosaminidase (43-53% and 84-93%) activity, likely due to gut mucus excretions and favorable physicochemical conditions. Sheetings and casts did not fundamentally alter the microbial diversity but raised soil conditions favorable to selective microbial growth. Overall, casts exhibited higher nutrient content (N, P), enzyme activity, and larger total microbial biomass than sheetings. Both structures stimulated soil microbial communities and enzyme activity associated with the in-crease of pH, OC and nutrients. Earthworm casts and termite sheetings have ecological significance in OC dynamics in plant residues amended soils.

Cowpea occupies a considerable place in the nutritional and economic balance of the rural population of Burkina Faso. However, its cultivation is marked by yield instability linked to soil depletion of nutrients, especially N and P, and irregular rains. The objective of this study was to evaluate the effect of phosphorus fertilization with the rock phosphate named BurkinaP, on the spatial and temporal variability of cowpea nodulation and yield. A multilocation test was conducted in 12 and 16 farmers’fields in 2013 and 2014, respectively, in 3 villages of 3 provinces of the northern region of Burkina Faso. Two treatments were compared: zaï without (ZS) and zaï with BurkinaP (ZP). Overall, dry weights of nodules and shoots at flowering stage, and grain at harvest, were significantly increased by BurkinaP. It is concluded that in soils where low availability of P limits crop yields of cowpea especially in arid sud-saharan areas of West Africa, the input of BurkinaP can improve cowpea N2-fixation, and increase and stabilize cowpea yields.

Dans la zone soudano-sahélienne du Burkina Faso, la performance des associations mixtes sorgho-niébé reste faible bien que les nombreux services écosystémiques rendus par les associations céréales-légumineuses soient connus. L’objectif de la présente étude a été de comprendre la performance des associations mixtes sorgho-niébé sur la productivité du sorgho et du sol. L’étude a consisté à conduire des tests multi-locaux avec de petits agriculteurs familiaux de la région Nord du Burkina Faso. Des traitements à base de zaï simple (ZS), zaï + 9 t ha-1 de substrats organiques (ZF) et zaï + 9 t ha-1 de substrats organiques + 50 kg ha-1 d’urée (ZFN) ont été testés en 2013, chaque traitement étant répété 9 fois. En 2014, le traitement ZFN a été remplacé par le traitement zaï + 9 t ha-1 de substrat organique + 600 kg ha-1 de Burkina Phosphate (ZFP). Chaque parcelle élémentaire a abrité l’association mixte sorgho-niébé et la monoculture du sorgho. Les résultats ont montré que l’association mixte sorgho-niébé a généralement entrainé une dépréciation des rendements du sorgho par rapport à la monoculture du sorgho. Par contre, une performance significative de +58% en 2014 et un accroissement de +10% en 2013 des rendements totaux grains de sorgho et de niébé ont été enregistrés par rapport à la monoculture du sorgho. Une grande efficacité d’acquisition des nutriments par le sorgho associé au niébé a été enregistrée en comparaison à la monoculture du sorgho. Pour une meilleure performance des cultures mixtes sorgho-niébé, les traitements ZS et ZF sont à recommander pour augmenter les rendements totaux grains de niébé et de sorgho ainsi que l’acquisition de N dans les grains du sorgho ; les traitements ZFN et ZFP sont, quant à eux, sont à recommander pour améliorer la fertilité résiduelle en N et P des sols dans la région Nord du Burkina Faso. English title: Performance of sorghum-cowpea mixed cropping system on sorghum and soils productivities in the Sudano-Sahelian zone of Burkina Faso In Sudano-Sahelian zone of Burkina Faso, the performance of sorghum and cowpea mixed cropping system remains low although the many ecosystems provided associated by cereal and legume mixed or intercropping system are known. The objective of this study was to understand the performance of these sorghum and cowpea mixed cropping system on the productivities of sorghum and soils. The study consisted to multi-local tests with small family farmers in the northern region of Burkina Faso. Treatments based on simple zaï (ZS), zaï + 9 t ha-1 of organic substrates (ZF) and zaï + 9 t ha-1 of organic substrates + 50 kg ha-1 of urea (ZFN) were tested in 2013, each treatment being replicated at 9 times. In 2014, the ZFN treatment was replaced by the zaï + 9 t ha-1 of organic substrate + 600 kg ha-1 of Burkina Phosphate (ZFP). Each elementary plot was occupied by sorghum and cowpea mixed cropping system and monocropping sorghum. The results showed that the yields of sorghum mixed by cowpea generally lowered than the yields of monocropping sorghum. In contrast, a significant performance of +58% in 2014 and an increase of +10% in 2013 on total sorghum and cowpea grains yields were recorded compared to monocropping sorghum. The high efficiency of nutrient acquisition by sorghum in mixed cropping system with cowpea was recorded compared to monocropping sorghum. For better performance of sorghum and cowpea mixed cropping system, ZS and ZF treatments are recommended to increase total sorghum and cowpea grains yields, the N acquisition in sorghum grains, and ZFN and ZFP treatments were suggested to improve residual N and P fertility of soils in the northern region Burkina Faso.