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    Diversity of arbuscular mycorrhizal fungi in Brazil’s Caatinga and experimental agroecosystems

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    Date
    2017-05
    Author
    Pontes, J.S.
    Oehl, F.
    Marinho, F.
    Coyne, D.L.
    Silva, D.K.A. da
    Yano-Melo, A.M.
    Maia, L.C.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Striga hermonthica is a serious parasite of cereals in most of the semi-arid savanna zone of West Africa, causing substantial yield loss. It has been observed that some soybean cultivars are capable of stimulating germination of S. hermonthica seed, which would reduce the seed bank in the soil. This study was undertaken to quantify the effect of a soybean crop (compared with a sorghum control) on S. hermonthica emergence in subsequent maize in three farmers' fields in northern Nigeria. Soybean cultivar TGx 1740-7F, previously identified as efficacious for S. hermonthica seed germination, was grown at four densities without P fertilizer to test the effect of increasing plant density of soybean on subsequent S. hermonthica parasitism. The effect of P as single super phosphate was tested on the two highest soybean densities. S. hermonthica parasitism on maize was significantly lower after unfertilized soybean than after the sorghum control treatment at two of three trial sites. Soybean rotation increased maize yield by approximately 90% for the three sites combined. Increasing soybean plant density did not result in lower emerged S. hermonthica. Application of P to soybean at the higher soybean densities resulted in higher root length density, lower emerged S. hermonthica on maize (P<0.15), and significantly higher maize yield. The results suggest that an efficacious cultivar of soybean reduces S. hermonthica parasitism on a succeeding maize crop and that the effect is increased by application of P to the soybean.
    http://dx.doi.org/10.1111/btp.12436
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1859
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1111/btp.12436
    IITA Subjects
    Biodiversity; Cowpea; Grain Legumes; Plant Diseases
    Agrovoc Terms
    Agriculture; Biodiversity; Ecological Indices; Glomeromycota; Tropical Soils
    Regions
    South America
    Countries
    Brazil
    Journals
    Biotropica
    Collections
    • Journal and Journal Articles5283
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