• Contact Us
    • Send Feedback
    • Login
    View Item 
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    •   Home
    • Journal and Journal Articles
    • Journal and Journal Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    Whole Repository
    CollectionsIssue DateRegionCountryHubAffiliationAuthorsTitlesSubject
    This Sub-collection
    Issue DateRegionCountryHubAffiliationAuthorsTitlesSubject

    My Account

    Login

    Welcome to the International Institute of Tropical Agriculture Research Repository

    What would you like to view today?

    Mineral N dynamics in bare and cropped Leucaena leucocephala and Dactyladenia barteri alley cropping systems after the addition of 15Nlabelled leaf residues

    Thumbnail
    Date
    1998
    Author
    Vanlauwe, Bernard
    Diels, J.
    Duchateau, L.
    Sanginga, N.
    Merckx, R.
    Type
    Journal Article
    Metadata
    Show full item record
    Abstract/Description
    In tropical cropping systems with few external imputs, efficient management of mineral N derived from added organic residues is essential for the proper functioning of the system. We studied the dynamics of mineral Nitroden (N) in the top 100 cm of soil with a system tensiometers and suction cups after applying 15N-labelled Leucaena Leucocephala and Dactyladenia bacteria residues to bare and cropped microplots installed in the respective alley cropping systems, and folloed the fate of the N for two maize-cowpea rotations (1992 and 1993). Fifty days after applying the residues (DAA), 20% of the added residue N was found in the soil profile of the bare Leucaena treatment and 5% under Dactyladenia, compared with 5% and 1%, respectively, where cropped. All values decreased to about 1% after 505 days. In the cropped soil, no mineral N derived from the residues was lost by leaching during the first 6 weeks. As the maize grew, the soil profile was gradually depleted of nitrate to near zero in the Dactyladenia treatment, whereas during the cowpea season the amount of nitrate N increased to 36 kg N ha-1 for the Leucaena treatment, and 26 kg N ha-1 for the Dactyladenia treatment. The soil of the bare microplots contained substantially more nitrate N (98 and 47 kg N ha-1 during the first year on average, under Luecaena and Dactyladenia, respectively) than that of the cropped microplots, except during 1993 cowpea season. Nitrate residing in the subsoil (80-100 cm) in the bare treatmentwas not readily leached to deeper soil. The risk of losses of native mineral N was greater during the first 50 DAA and to a lesser extent during the cowpea seasons. Improved management of the hedgerows could increase the potential of the hedgerow trees to recycle mineral N.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5666
    IITA Subjects
    Crop Systems; Soil Fertility; Maize; Cowpea; Soil Health
    Agrovoc Terms
    Cropping Systems; Residues; Bacteria; Soil Profiles; Maize; Cowpeas; Soil
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4842
    copyright © 2019  IITASpace. All rights reserved.
    IITA | Open Access Repository