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.

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