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Near-Surface Soil Nutrient Changes over Time under Native Prairie and Managed Agriculture in Arkansas

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Document pages: 14 pages

Abstract: Landuse change from native prairie to managedagriculture can have substantial impacts on soil nutrient properties. Nutrientrelease from soil organic matter decomposition is the soil’s inherent source oflong-term fertility; thus it is imperative to understand the effects ofcontinued landuse over time to avoid mistaking actual soil property changeswith simple inter-annual variability from oneyear to the next. The objective of this study was to evaluate the effects oflanduse (i.e. managed agriculture andnative prairie) in two contrasting physiographic regions (i.e. the Ozark Highlands region of northwest Arkansas and the GrandPrairie region of east-central Arkansas) on the change in extractable soilnutrients over a 15-yr period from 2001 to 2016. Extractable soil Ca, Mg, andZn increased at least two times more over time (P Averagedacross landuse, extractable soil S increasednine times more over time (P P Averaged across region, extractable soil Mn increased 2.5 times more overtime (P

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