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Table 1. Chemical analysis of a composite soil sample obtained at adepth of 30--40 cm between tree rows at the beginning of the experi-ment (April 1991).
Figure 1. Seasonal variations in leaf nitrogen (A), phosphorus (B) andpotassium (C) concentrations for all treatments
Table 2. Effects of the irrigation and fertilization treatments on thecorrelation coefficients (cant at r) between nitrogen and phosphorus (N--P)and nitrogen and potassium (N--K) leaf concentrations during theexperimental period from June 1991 till December 1994 (** = signifi-P < 0.01; * = significant at P < 0.05; and ns = not significant).
Figure 6. Effect of fertilization on retranslocation (%) of N (A) and P(B) on three sampling dates

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