Predicting the amount of biomass produced grassland depending on the rainfall recorded in the Sahelian area of North – Senegal in West Africa

Predicting the amount of biomass produced grassland depending on the rainfall recorded in the Sahelian area of North – Senegal in West Africa This study is the logical continuation of the first article, which has established strong correlations between the amount of rainfall and herbaceous biomass produced in the Sahel region, for different winters followed. It took place in Unit Pastoral Malandou, located in the north of Senegal, located in the administrative region of Matam between latitudes 15 ° and 16 ° 30 North and longitudes 13 ° 30 and 16 ° West, thus occupying part of the pastoral zone of Senegal. The work relates to the period 1994 - 2010, on the basis of (i) collection of rainfall data, (ii) direct measurements of the herbaceous production and (iii) interviews and surveys of farmers. All data and information stored, were subject to a treatment that has shown that the variability of production of course is closely linked to that of rainfall, which the experimental verification of these links have corroborated, Now, this is, to rely on the amount of rainfall each year, based on the production of biomass measured in the surveys of selected sites on the courses, to develop a simple estimation tool grassland productivity of the study area. Satisfactory correlations obtained on three ground control sites installed in the Pastoral Unity(r ? 0.90 to 0.93), helped develop a comprehensive prediction equation of type « Y = axn », summarizing the results achieved. This equation yielded reliable estimates of quantities produced on a grassy pasture lands within the area of study but can be extrapolated to other areas that are similar to it in the Senegalese Sahel.