LES ESPECES VEGETALES INDICATRICES DE LA FERTILITE DE SOLS DANS LA COMMUNE URBAINE D?AGUIE AU NIGER

A study based on farmers? surveys and phytosociological surveys in the fields were conducted in four villages of the urban commune of Agui? to determine plant species indicators of soil fertility. In each of the four villages (Doramaoua, Dan Kada, Kodaou and Dan Tchiro), fifteen farmers were randomly surveyed. Results indicated that some plants species gives information on the soils status in which they were grown. Hence plants species indicators of good soil fertility are Piliostigma reticulatum, Faidherbia albida, Guiera senegalensis, Dichrostachys cinerea, Bauhinia rufescens, Prosopis africana, Acacia nilotica, Albizia chevalieri et Ziziphus mauritiana for trees; Merremia tridentata, Eragrostis tremula, Dactylotenium aegyptium, Commelina forkalaei, Cassia mimosoides, Sporobolus spicatus, Cenchrus biflorus et Corchorus tridens for herbaceous. However, plant species, such as: Striga hermonthica, Merremia tridentata and Eragrostis tremula are indicators of poor soils. Therefore, there is an indigenous knowledge based on plant species that allows to know the state of fertility of soils.