Skip to main content

Table 5 Student-Newman-Keuls' (SNK) Test Comparison of Chlorophyll a concentrations for Control, Nitrogen (N), Phosphorus (P), and Nitrogen plus Phosphorus (N + P), and phosphorus gradient treatments (P1–P5, representing progressively higher P concentrations) using Passive Diffusion Periphytometer in the Bosque River Watershed during the period of July 30 – August 13, 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-03 C 8 0.49 0.24    C
  N 9 0.86 0.35    C
  N+P 9 4.55 1.92 A   
  P1 7 0.67 0.17    C
  P2 7 0.71 0.24    C
  P3 9 0.67 0.24    C
  P4 9 0.85 0.42    C
  P5 9 0.79 0.19    C
NB-05 C 9 0.99 0.26    C
  N 9 1.02 0.42    C
  N+P 8 2.15 0.50   B  
  P1 9 1.08 0.34    C
  P2 9 1.13 0.37    C
  P3 9 1.17 0.36    C
  P4 8 0.89 0.34    C
  P5 9 1.99 0.59   B