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Fig. 2. Mean soil-test values across five sites after 4 yr of no-till or chisel-disk tillage and deep-band fertilization (13 to 18 cm depth and spaced 76 cm) for band/row (BR) and inter-band/inter-row (IBR) sampling zones. Figure 2A, data for soil-test P and P fertilization. Figure 2B, 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.