• 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?

    Shoot water content and reference evapotranspiration for determination of crop evapotranspiration

    Thumbnail
    View/Open
    U17ArtOmondiShootNothomDev.pdf (330.5Kb)
    Date
    2017
    Author
    Omondi, J.O.
    Mungai, N.W.
    Ouma, J.P.
    Baijukya, Frederick P.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    Determination of water requirement for crops in resource limited areas is challenging, yet worsened by the common assumption that all crop varieties within a species have similar water requirements. The objective of the study was to indirectly determine crop evapotranspiration of soybean varieties, using reference evapotranspiration and shoot water content under tillage and no tillage cultivation. The treatments were no tillage and conventional tillage as main plots, and soybean varieties Nyala, SB19, and SB20 as sub-plots, replicated three times. Crop evapotranspiration (ETC) and crop coefficient (KC) were different among varieties, and increased during growth period. SB20 had the highest KC (0.8437 at 87 days after planting - DAP); followed by SB19 (0.7888 at 70 DAP), and Nyala (0.7026 at 66 DAP). Conversely,water use efficiency (WUE) was 0.58 in SB19, 0.52 in Nyala, and 0.47 in SB20.Validation of the calculated ETC using a crop production function showed a correlation of r = 0.97 between the observed and predicted yields of the three varieties. Furthermore, the normalised root mean square error (NRMSE) and the index of agreement (d) were 0.14 and 0.87, respectively indicating accurate fit. Calculated crop coefficient strongly correlated with observed shoot water content of Nyala (R2 = 1), SB19 (R2 = 1), and SB20 (R2 = 1).
    http://dx.doi.org/10.4314/acsj.v25i4.1
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2441
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.4314/acsj.v25i4.1
    IITA Subjects
    Grain Legumes; Soybean
    Agrovoc Terms
    Crop; Evaporation; Glycine Max; Shoot; Soyabean; Transpiration
    Regions
    Africa; East Africa
    Countries
    Kenya
    Journals
    African Crop Science Journal
    Collections
    • Journal and Journal Articles5283
    copyright © 2019  IITASpace. All rights reserved.
    IITA | Open Access Repository