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    Organic acids in the rhizosphere and root characteristics of soybean (Glycine max) and cowpea (Vigna unguiculata) in relation to phosphorus uptake in poor savanna soils

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    nwoke-organic-2008.pdf (228.2Kb)
    Date
    2008-10
    Author
    Nwoke, O.C.
    Diels, J.
    Abaidoo, R.C.
    Nziguheba, Generose
    Merckx, R.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Root characteristics associated with phosphorus (P) uptake under limiting soil-P conditions were examined in two sets of greenhouse experiments. Average diameter and length of soybean, cowpea, maize and sorghum roots were assessed after 7 weeks in three low-P soils amended with P fertilizer at 0, 3, 6, 11 and 23 mg Pkg. Organic acids in the rhizosphere of soybean, cowpea and pigeon pea were separately evaluated in one soil amended with or without rock phosphate, iron phosphate, aluminium phosphate, calcium phosphate, or triple super phosphate. Unplanted soil served as the control. The growth of soybean, cowpea, maize, and sorghum was significantly improved with P application in all the soils and the amount of P applied played an important role. The shoot dry matter yield and P accumulation correlated significantly with the root length of cowpea and the average diameter of sorghum roots. Citric acid was the only organic acid detected in measurable quantities in the rhizosphere of all plants tested; on average, it varied from 4 (pigeon pea) to 17 (soybean) ìmolg soil. For soybean, the secretion of citric acid appeared important for P acquisition in P-limiting environments whereas for cowpea, the size of the roots may be more important.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3595
    IITA Subjects
    Grain Legumes; Nutrition; Genetic Improvement
    Agrovoc Terms
    Legumes; Low Phosphorus Availability; Rhizosphere; Sparingly Soluble P
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4835
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