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    Nutrient use efficiency and harvest index of cassava decline as fertigation solution concentration increases

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    S18ArtOmondiNutrientInthomNodev.pdf (146.2Kb)
    Date
    2018-07-02
    Author
    Omondi, J.O.
    Lazarovitch, N.
    Rachmilevitch, S.
    Boahen, S.
    Ntawuruhunga, Pheneas
    Sokolowski, E.
    Yermiyahu, U.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    Response of cassava (Manihot esculenta Crantz) to fertigation as a form of nutrient delivery is unknown. The objectives of this study were to establish a balanced nutrition and to enhance agronomic nutrient use efficiency (ANUE) of cassava under fertigation. This study was conducted in the greenhouse and in the field. In both, the results showed a similar trend. There were six fertigation concentrations and three cassava varieties, selected for their duration of growth in the field. Shoot biomass of the long‐duration variety (Nalumino) was the highest, even though its dry root yield was the lowest (10.18 t ha−1) among the varieties. In contrast, the medium‐duration variety (Kampolombo) produced the highest dry root yield (20.34 t ha−1) and a lower shoot biomass. The highest root yield of the shortest‐duration variety (Mweru) was achieved at 200 mg N, 30 mg P, and 200 mg K L−1 (155.0, 23.3, 155.0 kg N, P, K ha−1), while Nalumino's was at 70 mg N, 7 mg P, and 70 mg K L−1 (54.3, 5.4, 54.3 kg N, P, K ha−1). ANUE and harvest index of these varieties declined as the fertigation concentrations increased. Additionally, the correlation between concentrations of N in the youngest fully expanded leaf (YFEL) blades and dry root yields was the lowest (R2 = 0.5488), whereas P and K were R2 = 0.7237 and R2 = 0.8006, respectively, an indication that nutrient concentrations in the leaf, especially N, cannot easily be used to predict root yield. When cassava reaches nutrient sufficiency, mainly N, its accumulation in the leaf continues without significant increase in the root yield.
    https://dx.doi.org/10.1002/jpln.201700455
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/4086
    Non-IITA Authors ORCID
    Stephen Boahen Asaberehttps://orcid.org/0000-0001-8946-401X
    Pheneas Ntawuruhungahttps://orcid.org/0000-0003-2330-9070
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1002/jpln.201700455
    Research Themes
    PLANT PRODUCTION & HEALTH
    IITA Subjects
    Cassava; Plant Health; Plant Production
    Agrovoc Terms
    Irrigation; Manihot Esculenta; Root Crops; Starch
    Regions
    Africa; Southern Africa
    Countries
    Zambia
    Journals
    Journal of Plant Nutrition and Soil Science
    Collections
    • Journal and Journal Articles4835
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