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Table 4 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 May 11–26, 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 8 0.40 0.16       F
  N 9 0.36 0.28       F
  N+P 9 0.37 0.13       F
  P 9 0.28 0.06       F
NB-02 Control 9 9.02 6.95   B C    
  N 9 10.09 6.76 A B     
  N+P 8 8.07 6.69   B C D   
  P 8 12.64 5.11 A      
NB-04 Control 9 2.50 0.70      E F
  N 8 3.31 1.38      E F
  N+P 7 4.41 1.77     D E F
  P 8 4.88 1.32     D E F
NB-05 Control 9 2.69 0.80      E F
  N 8 3.43 2.44      E F
  N+P 8 6.13 2.54    C D E  
  P 8 6.07 2.59    C D E  
HC Control 7 1.46 0.48       F
  N 8 1.19 0.51       F
  N+P 8 1.16 0.58       F
  P 9 1.07 0.64       F
MB Control 8 0.83 0.13       F
  N 9 1.33 0.82       F
  N+P 8 6.35 2.94    C D E  
  P 9 2.28 2.22      E F