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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Agroforestry systems 17 (1992), S. 97-118 
    ISSN: 1572-9680
    Keywords: West African parkland savanna ; tree-crop relations ; tree management ; shade influence ; Vitellaria paradoxa ; Parkia biglobosa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Les rendements en graines de sorgho sous le karité et le néré sont respectivement environ 50% et 70% plus basses que celles hors des houppiers. La fertilité du sol, étant le facteur limitant pour la production primaire dans la région, est au moins assez favorable sous les arbres que hors des houppiers. L'ombre sous les arbres, réduisant la lumière sous le néré à 20% au minimum, est probablement largement responsable pour la réduction des rendements sous les arbres. Les profits par la vente des produits des arbres sont plus élevés que les pertes de rendements céréaliers, ce qui explique pourqoui les arbres sont conservés dans les champs. La taille des branches, la selection des cultures qui résistent l'ombre et la selection des arbres peuvent réduire les pertes de rendements, mais n'auront pas un grand effet sur la productivité des arbres ni des cultures.
    Notes: Abstract Sorghum grain yields under the karité and the néré are reduced by an average of 50% and 70% respectively, in comparison with yields in the open field. Soil fertility, limiting primary production in the region, is at least as favorable under the tree canopies as in the open field. Reduced light intensity, to a minimum of 20% under the néré canopy, is probably largely responsible for low sorghum production under the tree canopies. Benefits from the tree products are more valuable than losses in cereal yields, explaining why trees are maintained on the agricultural fields. Pruning of tree branches, selection of (shade-) crops and tree selection could reduce crop yield losses but cannot be expected to increase tree- and crop production.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Mathematical methods of operations research 35 (1991), S. 321-345 
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The cast-plate-method of manufacturing acrylic-glass gives raise to a batch scheduling problem on parallel processing units. This paper introduces the real world problem as well as an appropriate mathematical programming formulation. We describe a heuristical approach for gaining production sequences that employ the parallel processing units to capacity.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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