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    Critical soil organic carbon range for optimal crop response to mineral fertiliser nitrogen on a ferralsol

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    Critical Soil Organic Carbon Range For Optimal Crop Response To Mineral Fertiliser Nitrogen On A Ferralsol (563.0Kb)
    Date
    2016
    Author
    Musinguzi, Patrick
    Ebanyat, Peter
    Tenywa, John Stephen
    Basamba, Twaha Ali
    Tenywa, Moses Makooma
    Mubiru, Drake N.
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    Abstract
    Soil Organic Carbon (SOC) is a major indicator of soil fertility in the tropics and underlies variability in crop response to mineral fertilizers. Critical SOC concentrations that interact positively with N fertilizer for optimal crop yield are less understood. A study was conducted on a Ferralsol in sub-humid Uganda to explore the critical range of SOC concentrations and associated fractions for optimal maize (Zea mays L.) yield response to applied mineral N fertiliser. Maize grain yield response to N rates applied at 0, 25, 50 and 100 kg N ha−1 in 30 fields of low fertility (SOC < 1.2%), medium fertility (SOC = 1.2–1.7%) and high fertility (SOC > 1.7%) was assessed. Soil was physically fractionated into sand-sized (63–2000 µm), silt-sized (2–63 µm) and clay-sized (<2 µm) particles and SOC content determined. Low fertility fields (<1.2% SOC) resulted in the lowest response to N application. Fields with >1.2% SOC registered the highest agronomic efficiency (AE) and grain yield. Non-linear regression models predicted critical SOC for optimal yields to be 2.204% at the 50 kg N ha−1 rate. Overall, models predicted 1.9–2.2% SOC as the critical concentration range for high yields. The critical range of SOC concentrations corresponded to 3.5–5.0 g kg−1 sand-sized C and 9–11 g kg−1 for clay-sized C.
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    https://nru.uncst.go.ug/xmlui/handle/123456789/171
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    • Agricultural and Veterinary Sciences [1421]

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