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Fig. 2. Poultry litter treatment effects on soil solution concentrations from suction lysimeters installed at a 50-cm depth in each plot. Means are shown by sampling date for (a) ammonium, NH₄–N, (b) nitrate, NO₃–N, (c) potassium, K, (d) calcium, Ca, (e) magnesium, Mg, and (f) sulfate, SO₄–S. Similar letters (or no letters) among the three treatments indicate no significant treatment effects according to Tukey's test ( ${alpha}$ = 0.05).