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Showing items 1 through 9 of 82.
  1. Library Resource
    Conference Papers & Reports
    April, 1980
    Africa

    Le Conseil alimentaire mondial réuni a Rome en 1974 a recommande aux gouvernements de prendre des mesures pour instaurer la reforme agraire et transformer progressivement les structures et les "relations socio-économique dans' les zone rurales afin d'accélérer la planification et la mise en œuvre de programmes "de développement rural intègre qui amèneraient une augmentation de.la production agricole et l’intégration sociale.

  2. Library Resource
    Conference Papers & Reports
    March, 1980
    Africa

    Au cours des deux dernières décennies, la situation alimentaire et

    agricole en Afrique s'est radicalement détériorée. En moyenne, pour chaque personne habitant dans la région, l’accès aux produits alimentaires est actuellement beaucoup plus difficile qu'il y a dix ans, et les normes alimentaires moyennes sont tombées en-deçà, des besoins nutritionnels.

  3. Library Resource
    Conference Papers & Reports
    December, 1980
    Africa

    On peut distinguer trois grandes périodes dans l'évolution de l’exploitation minière de l'Afrique en développement : la période précoloniale qui se situe avant 1890, date du paréage du continent en colonies, 1ère coloniale et les premiers temps de l'après-indépendance (de 189O à 1969 environ) et la période allant de le fin de la période d’accession à l’indépendance à nos jours (à partir de 1970).

  4. Library Resource
    Journal Articles & Books
    December, 1980
    Peru, Colombia, Argentina, Mexico, Brazil, Central America, Northern America, South America

    White mold, caused by the fungus Sclerotinia (Whetzelinia) sclerotiorum, is distributed worldwide and has more than 300 hosts. It infects flowers, cotyledons, seeds, leaves or injured plant tissue. The disease can be controlled by crop rotation, flooding, reduced seeding rates, application of chemical products in the middle of the flowering period, modifying plant architecture and the use of resistant var. Many soil microorganisms are associated with sclerotia and may cause them to degrade or fan to germinate. The symptoms and damage caused by the disease are illustrated in color.

  5. Library Resource
    Journal Articles & Books
    December, 1980
    Colombia, Central America, South America

    Efforts to develop cassava technology for the vast areas of acid infertile soils were continued Large-scale germplasm screening in the field was begun in Carimagua for tolerance to low levels of P and acidity and in Quilichao, for tolerance to low levels of P. Various fertilizer trials were used to determine: (a) nutrient absorption and distribution within the plant during a 12-mo.

  6. Library Resource
    Journal Articles & Books
    December, 1980
    Colombia, Central America, South America

    Research of the physiology section was centered on identifying the characters associated with high root yields and quality in cassava under stress conditions. Plant reaction to water stress was studied, specifically regarding growth and yields of var. M Mex 59 and M Col 22 with a period of artificial rain exclusion. Observations were made throughout the stress period and subsequent recovery. Water stress reduced LAI notably although M Mex 59 maintained a LAI approx. twice that of M Col 22 during the stress period. LAI for both var.

  7. Library Resource
    Journal Articles & Books
    December, 1980
    Colombia, Central America, South America

    Research of the physiology section was centered on identifying the characters associated with high root yields and quality in cassava under stress conditions. Plant reaction to water stress was studied, specifically regarding growth and yields of var. M Mex 59 and M Col 22 with a period of artificial rain exclusion. Observations were made throughout the stress period and subsequent recovery. Water stress reduced LAI notably although M Mex 59 maintained a LAI approx. twice that of M Col 22 during the stress period. LAI for both var.

  8. Library Resource
    Journal Articles & Books
    December, 1980
    Colombia, Central America, South America

    Efforts to develop cassava technology for the vast areas of acid infertile soils were continued Large-scale germplasm screening in the field was begun in Carimagua for tolerance to low levels of P and acidity and in Quilichao, for tolerance to low levels of P. Various fertilizer trials were used to determine: (a) nutrient absorption and distribution within the plant during a 12-mo.

  9. Library Resource
    Journal Articles & Books
    December, 1980
    Venezuela, Brazil, Central America, South America

    Different nutritional deficiencies or toxicities may limit bean development and yield. N and P deficiencies are the most frequent, although deficiency of minor elements and Al/Mn toxicity can reduce yields considerably. Nutritional problems are usually diagnosed by soil and plant tissue analyses and the observation of symptoms produced by nutritional disorders. Optimum pH for bean production varies between 6.5-7.5; within these limits, the majority of the plant nutrients have their max availability. Color illustrations are given of the symptoms of plant deficiencies and toxicities.

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