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Activity of acid phosphatase (APase) on the root surface of white lupin, faba bean and maize grown for 12 days with low (LP) and high P (HP) supply under two N forms [Ca(NO3)2 and NH4NO3]. Values are means of four replicates and the error bars represent the standard error of the mean. Different letters (lower case) represent significant differences between the P treatments within a plant species and N form (P < 0.05).
