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Table 6 Student-Newman-Keuls' (SNK) Test Comparison of Chlorophyll a concentrations for Control, Nitrogen (N), Phosphorus (P), and Nitrogen plus Phosphorus (N + P) treatments using Passive Diffusion Periphytometer in the Bosque River Watershed during the period of October 10–24, 1998.

From: Measuring variability in trophic status in the Lake Waco/Bosque River Watershed

Site Treatment Number of Replicates Mean Chl. a (μg cm-2) Standard Deviation (μg cm-2) SNK Group (α = 0.05)
NB-01 Control 7 0.80 0.34   B
  N 7 0.78 0.30   B
  N+P 6 0.73 0.20   B
  P 7 0.73 0.23   B
NB-02 Control 6 1.94 1.19 A B
  N 7 1.50 0.75 A B
  N+P 6 1.50 1.09 A B
  P 7 1.54 0.85 A B
NB-03 Control 7 0.61 0.18   B
  N 7 2.13 1.12 A  
  N+P 7 1.56 1.55 A B
  P 7 0.87 0.72   B