Programme d'amenagement hydro-agricole des terres rizicultivables de la Basse-Guinee. Rapport ad hoc

acid soils agronomia agronomie agronomy arable soils arroz calidad conception design drainage systems fertilidad del suelo fertilisation fertilizer application gestion des eaux gestion du sol hidrografia hidrologia hydrographie hydrography hydrologie hydrology irrigation systems manejo del suelo muestreo multiplication des plantes plant propagation quality reconocimiento de suelos red de drenaje rice riz saline soils sampling seed semence semillas sistemas de riego soil fertility soil management soil surveys sol acide sol arable sol salin suelo salino suelos cultivables variedades varieties water management