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Friesen, Dennis K. ,  [Development and diffusion of integrated Striga control practices for small-scale farmers in western Kenya] ,  Development and diffusion of integrated Striga control practices for small-scale farmers in western Kenya

Gijsman, AJ ,  Oberson, Astrid ,  Tiessen, H. ,  Friesen, Dennis K. ,  [A cautionary note about the use of the CENTURY soil-organic-matter model for ecosystems on highly-weathered tropical low-P soils] ,  A cautionary note about the use of the CENTURY soil-organic-matter model for ecosystems on highly-weathered tropical low-P soils

Friesen, Dennis K. ,  [Culticore : sustainable crop rotation and ley farming systems for the acid-soil savannas] ,  Culticore : sustainable crop rotation and ley farming systems for the acid-soil savannas

Amézquita Collazos, Edgar ,  Friesen, Dennis K. ,  Scovino Sanz, JI ,  [Indicadores de sostenibilidad : parámetros edafoclimáticos y diagnóstico del perfil cultural] ,  Indicadores de sostenibilidad : parámetros edafoclimáticos y diagnóstico del perfil cultural

Oberson, Astrid ,  Friesen, Dennis K. ,  Tiessen, H. ,  Moir, JO ,  [Effects of improved pastures and phosphorus inputs on phosphorus transformations in a Colombian oxisol] ,  Effects of improved pastures and phosphorus inputs on phosphorus transformations in a Colombian oxisol