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Agricultural development in Latin America and Africa is briefly analyzed, with particular reference to bean production. The major trends that affect bean production technology and its role in farming systems include population growth, especially in the highlands of Africa, and urbanization and in...

The process of identifying the "relevant constraints" and their incidence on breeding programs and agricultural research of international centers are explained and case histories are provided on the role of these 3 types of information (macro stage, micro stage, critical inference stage) related ...

THE METHOD USED TO SAMPLE THE MUNICIPALITIES FROM CASSAVA GROWING REGIONS IN ORDER TO CARRY OUT A CASSAVA PRODUCTION SURVEY IN BRAZIL IS DESCRIBED. IN STAGE 1, A MAP OF LATIN AMERICAN CASSAVA PRODUCTION WAS USED TO SELECT MAJOR ZONES OF INTEREST IN THE STATES OF PARA, MARANHAO, PERNAMBUCO, BAHIA,...

A partial report is given on the results of the monitoring project of cassava production systems in Manabi, Ecuador, determined from data collected on the farms during 2 visits at 3- mo. intervals. An increase in area planted to cassava, mainly due to low-risk marketing and price stability, was e...

The objectives of a cassava program in Ecuador are listed: the development and introduction of a simple technology that, without high inputs, allows the national av. yield to be increased; the economic, commercial production of cassava on acid, infertile soils of E. Ecuador (Amazonic region); and...

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...