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Table 1 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 July 17 – 30, 1997 (from Matlock et al., 1999, included for comparison).

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 10 0.88 0.60     D E
  N 10 0.95 0.38     D E
  P 9 1.06 0.53     D E
  N + P 10 0.98 0.53     D E
NB-02 Control 10 4.58 0.86 A     
  N 10 5.10 1.61 A B    
  P 9 6.22 1.91 A B    
  N + P 10 5.19 1.86 A B    
NB-04 Control 7 1.73 0.37    C D  
  N 5 2.08 0.38    C D  
  P 9 2.49 0.51    C   
  N + P 8 5.73 1.36 A B    
MB Control 10 0.47 0.20      E
  N 9 0.52 0.08      E
  P 9 0.90 0.32     D E
  N + P 10 5.87 1.93 A B    
NC Control 10 0.48 0.14      E
  N 10 0.59 0.17      E
  P 9 2.70 1.16    C   
  N + P 10 2.67 0.82    C