Table 3.

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 April 5–19, 1998.

Site	Treatment	Number of Replicates	Mean Chl. a (μg cm-2)	Standard Deviation (μg cm-2)	SNK Group (α = 0.05)
NC	Control	10	0.71	0.26		B	C
	N	10	0.89	0.55		B	C
	N+P	10	1.21	0.60	A	B
	P	10	1.36	0.54	A
MB	Control	10	0.56	0.27			C
	N	10	0.73	0.24		B	C
	N+P	10	0.91	0.63		B	C
	P	10	0.85	0.40		B	C