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    Improvement of the physical fertility of a degraded Alfisol with planted and natural fallows under humid tropical conditions

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    salako-improvement-2001.pdf (752.1Kb)
    Date
    2001
    Author
    Salako, F.
    Hauser, S.
    Babalola, O.
    Tian, G.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Topsoil (0–15 cm) bulk density, aggregate stability, soil dispersibility, water retention and infiltration were measured between 1989 and 1996 on an Alfisol under rehabilitation in southwestern Nigeria. The planted leguminous species were Pueraria phaseoloides, Senna siamea, Leucaena leucocephala, Acacia leptocarpa and A. auriculiformis. Also, plots with natural fallow and maize/cassava intercropping were included. Level (minimum) and mound tillage with hoes was adopted for the cultivated areas under study after 4 and 6 year fallow periods. Under fallow, the soil bulk density decreased from1.56 to 1.11 t m73.The continuously cropped treatment (level tillage) had significantly higher bulk density than the fallowed subplots after 6 years. Mean soil penetrometer resistance ranged from 75 to 157 kPa for fallowed plots and from 192 to 295 kPa for the continuously cropped (level tillage) subplot. Surface soilwater contentswere similar for all the treatments during the soil strength measurements. Although soil aggregates were generally of low stability and not well formed, they were improved by fallowing. Soil structural improvement by planted fallows was similar to that by natural fallow, but the trees were more promising for long-term fallow (>6 years) than the herbaceous P. phaseoloides. However, the improvement in soil structure after 4 or 6 year fallow could not be maintained in subsequent cropping. Furthermore, the significant improvement in soil bulk density caused by A. auriculiformis and natural fallow was more rapidly lost on the cultivated subplots compared with other fallow treatments. Thus, soil structure recovery under a fallow does not imply a sustained improvement when stress is applied to this soil. Post-fallow soil management options such as residue incorporation and tillage to ameliorate compaction or soil strength will be necessary to enhance the improvements by fallow species.
    https://doi.org/10.1111/j.1475-2743.2001.tb00006.x
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3760
    Digital Object Identifier (DOI)
    https://doi.org/10.1111/j.1475-2743.2001.tb00006.x
    IITA Subjects
    Soil Fertility; Climate Change; Grain Legumes; Soil Health; Soil Information; Forestry
    Agrovoc Terms
    Soil Fertility; Alfisols; Fallow; Legumes; Trees; Soil Physical Properties; Humid Tropics
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4835
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