Conservation agriculture as a labour saving practice for vulnerable households. A study of the suitability of reduced tillage and cover crops for households under labour stress in Babati and Karatu districts, Northern Tanzania

adoption de l'innovation agricultura tradicional agriculture traditionnelle changement technologique conservation des sols conservation tillage cover plants data collection encuestas evaluation hogares households innovation adoption labour productivity plantas de cobertura plante de couverture productividad del trabajo soil conservation surveys technological changes traditional farming travail du sol de conservation