This study was conducted to evaluate the morphological and agronomic performance of ten varieties of sweet potato grown in Bongor in Chad during the dry season. The average length of internodes of the main stem and means the collar diameters were measured and maximum growth rates associates were determined, the length and diameter of tuber were measured, the number of tuber per plant were recorded tuber yield, the diameter/length ratio of the tuber, the average weight of tuber and dry matter aboveground biomass were determined. The results, it appears that varieties BF 59 and BF 40 have the longest and varieties BF 108 and TIB have diameters in the larger collar internodes. The highest growth rates were noted between the 37th and 51st JAP and between the 23rd and 72nd JAP respectively for the length of internodes and the collar diameter. For agronomic parameters, variety BF 108 was more effective for most of the studied parameters. This variety seems interesting for the selection of work.

The objective of this study was to highlight the physiological, morphological and agronomic performance of varieties and descendants of sesame (Sesamum indicum) grown in Burkina Faso. Experimentation was conducted at the Gampela educational agro station located at 12

Cowpea (Vigna unguiculata (L.) Walp.) is one of the most important arid legumes cultivated for pulse and forage production in the savannas of west Africa. Its cultivation is confronted to biotic and abiotic constraints. The abiotic constraints are primarily of (recorded rainfall, temperature, poor soil). This research was conducted to identify cowpea breeding lines that tolerant to drought. Seven genotypes obtained from cowpea breeding program of marker-assisted recurrent selection (C2-111-4, C2-111-2, C2-9-3, C2-11-3, C2-31-2, C254-4 and C2-64-2), two parents of crossing (Gorom local and IT97K-499-35) and IT99K-573-2-1 (yiis yande, grown under drought stressed and non-stressed conditions. Drought stress reduced seed yield, 100 seed weight and chlorophyll stability index. Correlation between stressed and non-stressed seed yield were (r=+0.646). Biplot displays of quantitative indices of stress tolerance and genotypes seed yield indicating that genetic variability for drought tolerance existed amongst the tested germplasm with regard to seed yield and drought tolerance. According to their yielding ability and quantitative indices of stress tolerance, the genotypes (C2-31-2, C2-9-1, IT97-499-35, C2-111-4, C2-111-2, C2-9-3, C2-11-3, et C2-64-2) were grouped in low yielding under drought condition; Gorom local et C2-54-4 in order were identified as high yielding and moderate yielding under drought. IT99K-573-2-1 was found to be susceptible drought.