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Inorganic soil nitrogen in relation to soil properties in smallholder maize fields in the Kenya highlands

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We investigated the influence of soil charge properties on the distribution of inorganic soil N in maize (Zea mays) fields on smallholder farms in the subhumid highlands of Kenya. There was little or no fertilizer use in these subsistence farming systems. Soil NO3− was measured to 2 m depth in maize fields on 96 farms sampled in transects at three physiographic positions (ridgetop midslope and lower slope) in each of six soil map units (4 or 8 transects per soil map unit) covering four parent materials: acid igneous various igneous basic igneous and sedimentary. Soil NO3− concentrations varied from

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