Increased farm production through fertilizer use, Ghana. Agronomic experimentation and extension work in the Volta, central and Ashanti/Brong-Ahafo regions - Technical report 2

abonos agronomia agronomie agronomy application rates arachide cacahuete cassava caupi coton cotton cowpeas crop rotation crops cultivos cultural methods dose d'application economic analysis engrais extension extension activities ferme pilote fertilizers fincas experimentales groundnuts igname mais maize mandioca manioc mode de culture names pilot farms plant production plante de culture programme de formation rendement rendimiento rotation culturale soja soybeans training programmes trial methods variedades varieties vulgarisation yams yields