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Fig. 4. Soil Mehlich III–extractable PO₄–P from the (a) 0- to 8-cm depth (excluding O horizon) and (b) 8- to 24-cm depth presented as micrograms of P per gram of soil. Plotted are treatment means for each sampling date. Similar letters (or no letters) among the three treatments indicate no significant treatment effect at that date according to Tukey's test ( = 0.05).

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