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The different methodological stages of cassava on-farm trials and their relationships regarding the objectives and functions of the Cassava Program at the Centro Internacional de Agricultura Tropical (CIAT) are outlined. Site selection, farm trial design and analysis, and some illustrative result...

Activities of international cooperation during 1981 are listed. Training courses in cassava production, tissue culture, physiology, and in advanced research for postgraduate work were attended by 38 professionals from 16 countries. From 1973 to 1981 cassava hybrid seeds have been distributed in L...

Se presentan las actividades de cooperacion internacional durante 1981. Se dictaron cursos de capacitacion cientifica sobre produccion de yuca; cultivo de tejidos; fisiologia; y especializacion de posgrado a 38 profesionales de 16 paises. Desde 1973 hasta 1981 se ha distribuido semilla hibrida en...

Advances in research of the soil and plant nutrition section of CIAT's Cassava Program in 1981 are given regarding symptoms of Ca and S deficiency, germplasm screening for adaptation to high acidity and/or low P; effect of fertilization (long-term fertility); level and time of K application; effe...

During 1981 the analysis of the potential adoption and impact of improved cassava production technology was continued at various levels and included: farm-level studies of the profitability of improved technology and constraints to adoption; analysis of costs of processing and marketing; and rese...

Durante 1981 se continuo el analisis de la adopcion potencial y el impacto de la tecnologia mejorada en la produccion de yuca en varios niveles se incluyo: estudios sobre la rentabilidad de tecnologia mejorada en fincas y limitaciones para la adopcion; analisis de costos de procesamiento y mercad...

Losses in root and planting material production caused by different pests as well as their biological control are evaluated. Studies of pests damaging dried cassava in storage were initiated. Biological aspects and form of attack of the following pests are described: stemborers (Lagochirus rogers...

During 1981, the efforts to use meristem-culture methods have continued, together with thermotherapy for recovering healthy clones. Frog skin disease was eradicated up to 100 percent in different cassava clones during various propagation cycles through the culture of small meristem tips. A routin...

Since product development according to consumer-defined specifications constitutes a key to success for integrated cassava products, the process for generating and selecting concepts for new products and turning them into successful commodities are described. New products also cover traditional c...

Puesto que el desarrollo de productos segun especificaciones definidas por el consumidor constituye una clave para el exito de los proyectos integrados de yuca, se describe el proceso seguido para generar y seleccionar conceptos para productos nuevos y transformarlos en productos basicos exitosos...

Development models are outlined to shed light on cassava's potential to generate economic growth. Since small cassava producers are to a large extent marginalized from the development process in Latin America, the CIAT cassava program has tried to define development strategies that are clearly or...

Se esbozan algunos modelos de desarrollo para aclarar el potencial de la yuca en la generacion de crecimiento economico. Debido a la marginacion de los pequenos agricultores de yuca del proceso de desarrollo en America Latina, el programa de yuca del CIAT ha tratado de definir estrategias de desa...

Detailed information on the activities of the CIAT breeding program and African regional and national programs is presented, with special emphasis on the Great Lakes Regional Project in Central Africa. The main activities carried out in 1985 in the areas of training, var. development and introduc...

Se presenta informacion detallada sobre las actividades del programa de mejoramiento del CIAT y de los programas regionales y nacionales en Africa, con enfasis especial en el Proyecto Regional de los Grandes Lagos en Africa central. Se resumen y se presentan los principales resultados de las acti...