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.

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