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    Norms for multivariate diagnosis of nutrient imbalance in Arabica and Robusta coffe in the East African highlands

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    S12ArtWairegiNormsInthomNodev.pdf (367.2Kb)
    Date
    2012
    Author
    Wairegi, L.W.I.
    Asten, Piet J.A. van
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Poor soil fertility is a constraint to coffee production. Targeting fertiliser recommendations to nutrient deficiencies can contribute to improved crop response to fertiliser. This study aimed to derive and compare the Compositional Nutrient Diagnosis (CND) and Diagnosis and Recommendation Integrated System (DRIS) norms for Arabica and Robusta, and to investigate nutrient interactions using data derived from 164 plots. The high-yield sub-populations of Arabica had significantly (p < 0.01) higher P (0.23 vs. 0.14) and K (2.87 vs. 2.04), and lower N (2.96 vs. 3.61), Ca (0.99 vs. 1.50) and Mg (0.40 vs. 0.23) than those of Robusta.With respect to the CND norms, Arabica had significantly (p < 0.001) higher P and K, and lower N, Ca and Mg means of row-centered log ratios than Robusta. The relationship between the CND and DRIS indices had coefficient of determination (R2) = 0.75–0.99 for both coffee types. The relationship between nutrient imbalance indices for CND and DRIS had R2 of 0.95 (Arabica) and 0.76 (Robusta). Both coffee types had negative N–Ca, P–Mg and K–Mg interactions. Arabica had positive N–Mg and K–Ca interactions and Robusta had positive N–K, P–K and Ca–Mg interactions and negative N–P, N–Mg, P–Ca and K–Ca interactions. The study concludes, there is a need for cultivar-specific norms, but such norms developed under one set of conditions may not be applicable under different conditions. The study also concludes that both CND and DRIS can be used to determine nutrient imbalances, and fertiliser requirements could be cultivar-specific.
    https://dx.doi.org/10.1017/S0014479712000142
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1415
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1017/S0014479712000142
    IITA Subjects
    Soil Fertility
    Agrovoc Terms
    Coffee; Cash Crop; Highlands; Nutrient
    Regions
    Africa; East Africa
    Countries
    Kenya; Uganda
    Journals
    Experimental Agriculture
    Collections
    • Journal and Journal Articles4839
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