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    Determinants of fertilizer microdosing-induced yield increment of pearl millet on an acid sandy soil

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    S16ArtIbrahimDeterminantsInthomDev.pdf (507.1Kb)
    Date
    2016-10
    Author
    Ibrahim, A.
    Abaidoo, R.C.
    Fatondji, D.
    Opoku, A.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Recent studies have reported the benefits of fertilizer microdosing in increasing crop yields in low input cropping systems. Little information is however available on the mechanisms underlying this effect. The objective of this study was therefore to explore the root-based mechanisms governing the growth enhancing phenomena of the fertilizer microdosing technology. A two-year experiment was conducted at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Research Station in Niger. Four treatments comprising (i) 2 g hill−1 of diammonuim phosphate (DAP), (ii) 6 g hill−1 of compound fertilizer NPK, (iii) broadcasting of 200 kg ha−1 of compound fertilizer NPK (recommended rate) and (iv) unfertilized control was arranged in a randomized complete block design with four replications. On average, fertilizer microdosing treatments (2-g DAP hill−1 and 6-g NPK hill−1) achieved 86% and 79% of the grain yields recorded from broadcasting of 200-kg NPK ha−1, respectively, in 2013 and 2014. The leaf area index and leaf chlorophyll content significantly increased with fertilizer microdosing at the early stage of millet growth. At the same stage, fertilizer microdosing enhanced the lateral root length density in the topsoil (0–20 cm) by 72% and 40% at respective lateral distances of 25 cm and 50 cm from the centre of the hill compared with broadcast of 200-kg NPK ha−1. Fertilizer microdosing did not significantly change soil pH in the root zone. It is concluded that the positive effect of fertilizer microdosing in increasing millet yield results from the better exploitation of soil nutrients due to early lateral roots proliferation within the topsoil.
    https://dx.doi.org/10.1017/s0014479715000241
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1443
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1017/s0014479715000241
    IITA Subjects
    Integrated Soil Fertility Management; Soil Fertility
    Agrovoc Terms
    Fertilizers; Pearl Millet; Soil Fertility; Fertilizer Microdosing; Technology
    Regions
    Africa; West Africa
    Countries
    Niger
    Journals
    Experimental Agriculture
    Collections
    • Journal and Journal Articles4842
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