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Showing items 1 through 9 of 106.
  1. Library Resource
    Conference Papers & Reports
    December, 1972
    Colombia, Central America, South America

    Yield trials with farmers and acceptance surveys were conducted in Colombia in 1969-1970 to assess the potential use of opaque-2 maize in the tropical regons of the country. Yields were variable, particularly from one farm to another. In spite of this variability which may have confused the results, and analysis of variance was applied, using farms as replications.

  2. Library Resource
    Conference Papers & Reports
    December, 1988

    A regional workshop was held in Ethiopia (Eastern Africa) to assess the status, future needs, and methodological issues of soil fertility research for bean cropping systems on the continent. Traditional forms of soil fertility maintenance, diagnosis of soil fertility constraints, nutrient requirements, use of fertilizers, cropping systems and soil fertility, and soil organic matter and the use of green manures and mulching were addressed.

  3. Library Resource
    Conference Papers & Reports
    December, 1990

    El Programa de Arroz del CIAT ha intensificado el mejoramiento de la tolerancia a los suelos ácidos de sabana. Las principales limitantes del arroz en este ecosistema son: falta de variedades de arroz adaptadas a los suelos ácidos e infértiles, limitaciones biológicas (enfermedades e insectos), e información inadecuada sobre algunas prácticas agronómicas. El mejoramiento varietal se ha orientado hacia el desarrollo de variedades de arroz aptas para producir en un sistema de mínimos insumos. Se describe un procedimiento para la selección de variedades en el campo.

  4. Library Resource
    Conference Papers & Reports
    December, 1988
    Tanzania, Zambia, Malawi, Sub-Saharan Africa, Africa

    Several traditional methods of maintaining soil fertility in bean-based cropping systems are reviewed as follows: visoso, large- scale chitemene, ngoro or matengo pit (Mbinga District, Tanzania), mambwe land-use system of northern Zambia (fundikila), mounds of the Wafipas (SW Tanzania), tumba land-use system (southern Tanzania), guie (central highlands of Ethiopia), mafuku in Zaire, termite mounds, agroforestry, relay intercropping systems, coffee- banana-bean cropping system of the Wahayas of Bukoba (Tanzania), removal of maize tassels (northern Malawi), and storage of nutrients in weeds (

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