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... study was carried out in the commune of Illéla . It covers an area of 2700 km 2 and lies between the geographical coordinates 5˚14'38'' East longitude and 14˚27'43'' North latitude (Figure 1) [9]. The climate is Sahelo-Sudanian, semiarid, characterized by three main seasons: a cold, dry season from November to February; a hot dry season from March to May; and a rainy season from June to October. ...
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