The rate and sequence of adoption of improved cereal technologies; the case of rain-fed barley in the Mexican Altiplane

adoption de l'innovation agricultural chemicals agricultural development agricultural structure analisis analyse analysis barley cebada cereales cereals condiciones ambientales condition de milieu crops cultivos cultivos de grano economic plants encuestas engrais environment environmental conditions environnement equipment equipo farm size farm structure fertilizers grain crops herbicidas herbicide herbicides innovation adoption medio ambiente methode methods modernisation modernization orge plant production plantas plante plante de culture plants production produit agrochimique profitability rentabilidad statistics structure agricole structure d'exploitation agricole surveys technologie technology tecnologia