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Fig. 1. Mean soil-test values across five sites after 4 yr of no-till or chisel-disk tillage without fertilization but with previous broadcast fertilization for row and inter-row sampling zones. Figure 1A, data for soil-test P and P fertilization. Figure 1B, data for soil-test K and K fertilization. * Significant (P $≤$ 0.1) tillage or sampling zone differences. CI, confidence interval (P $≤$ 0.1) of a treatment mean.