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    Response of grain legumes to phosphorus application in the guinea savanna agro-ecological zones of Ghana

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    U18ArtAdjeinsiahResponseInthomDev.pdf (1008.Kb)
    Date
    2018
    Author
    Adjei-Nsiah, Samuel
    Alabi, B.U.
    Ahiakpa, J.K.
    Kanampiu, F.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Grain legumes (cowpea, peanut, and soybean) play important roles in household food and income security in smallholder farming systems in the Guinea Savanna agro-ecological zones of Ghana. However, yields are low, rarely exceeding 600 kg ha−1, prompting the need to evaluate responses of grain legumes to P fertilizer applications for two seasons. Conducting P studies is critical to help farmers adopt economic-based recommendations. Treatments evaluated in 2015 for the three crops were (i) farmers’ practice (no input and planted by farmer); (ii) control (no input and planted by researcher), and (iii) triple super phosphate (TSP) fertilizer. However, for soybean, an additional two treatments (inoculant only and inoculant plus TSP fertilizer) were included. In 2016, the treatments were the same, except on-farm demonstrations were not conducted on cowpea. The demonstrations were laid out in a Randomized Complete Block Design with each demonstration representing a replicate within a region. On average, P-fertilizer application increased yields by 296; 527, and 390 kg ha−1 for cowpea, peanut, and soybean grains, respectively. On average over the two seasons, P-fertilizer increased yield by 9.85; 13.00, and 17.56 per kg ha−1 kg−1 P applied for cowpea, soybean, and peanut, respectively, and these applications were cost effective. Peanut showed little response to P in the Upper East Region compared with a greater response in the Northern and Upper West Regions, suggesting that benefits from P-fertilizer for peanut may be location-specific. On average, rhizobium inoculation increased grain yield by 157 kg ha−1 across the three regions and significantly positive effects of inoculation were observed in both seasons. Our results show that substantial increases in grain legume yield may be achieved by applying P fertilizers, but farmers cannot afford them because of their relatively high cost. Planting adapted and improved varieties and using rhizobium inoculants may provide the most economically viable and low risk options for increasing yields of grain legumes in the savanna agro-ecological zones of Ghana
    http://dx.doi.org/10.2134/agronj2017.11.0667
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3430
    Non-IITA Authors ORCID
    Samuel Adjei-Nsiahhttps://orcid.org/0000-0002-7394-4913
    Fred Kanampiuhttps://orcid.org/0000-0002-2480-6813
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.2134/agronj2017.11.0667
    IITA Subjects
    Cowpea; Farming Systems; Food Security; Grain Legumes; Plant Production
    Agrovoc Terms
    Grain Legumes; Food Security; Farming Systems; P-Fertiliser; Smallholders; Cowpeas; Peanut; Soybeans
    Regions
    Africa; West Africa
    Countries
    Ghana
    Journals
    Agronomy Journal
    Collections
    • Journal and Journal Articles4835
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