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Fig. 2. Variation in the concentration of total phosphorus (TP) and reactive phosphorus (RP) for different particle-size fractions in near-surface flow to 30 cm from untreated 30-m² plots for three consecutive sampling periods: (a) 2 Mar. 1999, (b) 4 Mar. 1999, and (c) 10 Mar. 1999. The data are means of six replicate plots; the error bars represent 1 SE. The variation in TP and RP for different particle-size fractions is significant (p = 0.05).