![]() ![]() ![]() We observed an increased SOC content, SOC stock, and A-horizon thickness with EC a and wetness index. Regression kriging was selected as prediction model where EC a and local topographic information (i.e., slope gradient, slope aspect, elevation, wetness index, altitude above channel network etc.) were used as predictors. The mean A-horizon thickness for agricultural soils was 28cm compared to 15cm under adjacent grassland. Average SOC concentration of the A-horizon from soil sampling area A, B, and C were 6.1, 7.1, 8.3gkg −1, respectively. Soil samples were collected from three different areas (area A, B, and C) that were sampled through grid sampling (GS, n=100), conditioned latin hypercube sampling (cLHS, n=100), and random sampling (RS, n=150) schemes. This study mapped the spatial variability of SOC concentration, A-horizon thickness, and SOC stocks from the Central Sands in Wisconsin. Soil organic carbon (SOC) plays a crucial role in maintaining fertility and productivity in sandy soils. ![]()
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