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  • 1
    Electronic Resource
    Electronic Resource
    The influence of soil variability on tree establishment at an experimental agroforestry site in North East Nigeria (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 13 (1997), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. The characteristics and variability of soils within a 30 ha experimental site in N. E. Nigeria are analysed in relation to tree establishment. Profile description and analyses for some 480 surface samples of the sandy to clayey surface soils from Lake Chad lacustrine sediments provide baseline properties against which any subsequent modifications resulting from agroforestry practices can be assessed and to which initial tree performance can be related. This has been undertaken using principal component and spatial analyses. Inherited soil properties show spatial variations across the site which can be related to the soil textural parameters. The initial survival of trees planted for agroforestry experimentation shows strong correlations with the inherited characteristics of the soil rather than with acquired soil properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.1997.tb00549.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The evaluation of preliminary farming systems technologies: Zero-tillage systems in West Africa
    Amsterdam : Elsevier
    Agricultural Systems 11 (1983), S. 95-103 
    Details
    ISSN: 0308-521X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0308-521X(83)90024-0
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of coppiced teak (Tectona grandis L.F.) regrowth and roots on intercropped maize (Zea mays L.) (1985)
    Springer
    Agroforestry systems 3 (1985), S. 381-386 
    Details
    ISSN: 1572-9680
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Trenching and shoot removal showed the relative influences of living roots and the canopy cast by teak (Tectona grandis L.F.) coppice regrowth on the growth and yield of interplanted maize (Zea mays L.). Teak and maize were planted at 1.8 × 1.8 m and 0.3 × 1.8 m spacing respectively. Competition for light started about four weeks after planting and caused etiolated height growth of maize. When combined with root competition it caused stunted growth. Shading also substantially reduced total dry matter production, grain yield, number of cobs per plant, average cob weight, and weight of grains per cob of maize (P〈0.01). Living teak roots alone did not have a significant effect (P〉0.05) on maize height growth, total dry matter production, grain yield, number of cobs per plant,average cob weight and weight of grains per cob. However, combined with shading, living roots of teak appreciably reduced total dry matter yield and average cob weight of maize (P〈0.01).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00055719
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  • 4
    Electronic Resource
    Electronic Resource
    Soil andLeucaena leucocephala L. growth variability underFaidherbia albida Del. andZiziphus spina-christi L. Desf. (1993)
    Springer
    Agroforestry systems 21 (1993), S. 287-292 
    Details
    ISSN: 1572-9680
    Keywords: tree mixtures ; soil nutrients ; crop yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In order to obtain data which will facilitate the scientific development of multiple intercropping of trees in agroforestry systems, the effects ofFaidherbia albida Del. orZiziphus spina-christi L. Desf. on soil quality and on yield of interplantedLeucaena leucocephala L. were investigated. The distance to which bothFaidherbia albida andZiziphus spinachristi trees improved soil quality as well asLeucaena leucocephala andSorghum vulgare L. production around them was about two times the radius of the tree crown. Higher yields of plants underZiziphus spina-christi thanFaidherbia albida were explained by similarly higher concentrations of available phosphorus (P). Other soil parameters, including total nitrogen (N), were similar under both species; being higher under the tree canopies than away from them. The study identified optimum tree spacing for agroforestry to be twice the tree crown radius. It also demonstrated the advantages of multiple tree mixtures over pure stands in improving soil quality and productivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705247
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  • 5
    Electronic Resource
    Electronic Resource
    The economic potential of leguminous tree crops in zero-tillage cropping in Nigeria: a linear programming model (1985)
    Springer
    Agroforestry systems 2 (1985), S. 129-138 
    Details
    ISSN: 1572-9680
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract An economic evaluation of zero-tillage farming system against the background of small-scale farmers in south west Nigeria was undertaken using the linear programming method to maximize yearly net return on Alfisols. Alternative crop rotation systems considered were maize-maize, maize-Stylo, maize-maize/Stylo, maize-pigeon pea, maize-maize/pigeon pea, and maize/Leucaena-maize/Leucaena. The maximum net profit farm plan, for an individual farmer with N300.00 cash investment, comprised 1.35 ha (95%) maize/Leucaena-maize/Leucaena and 0.07 ha (5%) maize-Stylo rotation systems. Net profit associated with the plan was N978.58 while shadow prices of rejected systems ranged between N66.68 and N168.24, indicating stability of the model. Under severe cash constraints and where hired labour was available at relatively low cost the maize/Leucaena alley cropping system was the most promising package. The results suggested a promising future for the combined production of agricultural and forestry crops under an integrated land management system by small-scale farmers in the humid tropics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00131270
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  • 6
    Electronic Resource
    Electronic Resource
    Crop production on soil under some forest plantations in the Sahel (1987)
    Springer
    Agroforestry systems 5 (1987), S. 185-188 
    Details
    ISSN: 1572-9680
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The production of maize (Zea mays L.), guinea corn (Sorghum vulgare L.) and groundnuts (Arachis hypogea L.) grown in pots on soils sampled under neem (Azadiracta indica A. Juss), Eucalyptus camaldulensis Dehnh, and Prosopis juliflora Swartz, plantations in the Sahel region of Nigeria was investigated. Ordinary field soil adjacent to the plantation formed the control against which forest and species effects on the soil were compared. Crops, particularly maize and sorghum, produced higher dry matter on forest influenced soil than on ordinary field soil. The leguminous groundnuts however, appeared to have fixed its own nitrogen and therefore depended less on the inherent fertility advantages of the forest soil. The highest crop yield was obtained on the soil under neem followed by Prosopis, Eucalyptus and ordinary field. Since forest species differed in their effects on crop yield, further indentification, categorization and development of species with positive effects on crop yield was suggested for priority attention.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00047521
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