Nitrate + Nitrite-N Concentration in Groundwater at the Lakeland Agricultural
Complex 1991-1998.
| |
Water collection dates
|
|
Field
ID#
|
Trt
#
|
12/10/91
|
12/09/92
|
11/23/93
|
11/23/94
|
04/23/96
|
04/09/97
|
11/13/97
|
11/16/98
|
| |
ppm
|
|
101
|
1
|
41.5
|
39.7
|
29.2
|
21.3
|
39.0
|
27.3
|
21.8
|
20.6
|
|
210
|
1
|
48.5
|
44.2
|
42.0
|
27.1
|
21.2
|
22.1
|
16.8
|
16.5
|
|
303
|
1
|
21.3
|
36.4
|
28.5
|
18.0
|
23.5
|
21.6
|
20.9
|
20.8
|
|
Mean
|
|
37.1
|
40.3
|
33.2
|
22.1
|
27.9
|
23.6
|
19.8
|
19.3
|
|
CS 1
|
C. Corn
|
C
|
C
|
C
|
C
|
C
|
C
|
C
|
C
|
| |
|
|
|
|
|
|
|
|
|
|
108
|
2
|
60.5
|
47.8
|
45.6
|
49.8
|
15.5
|
12.3
|
12.7
|
10.3
|
|
203
|
2
|
14.0
|
20.0
|
18.7
|
19.1
|
13.2
|
8.9
|
9.9
|
6.7
|
|
304
|
2
|
20.1
|
20.1
|
16.4
|
14.8
|
14.0
|
8.5
|
10.5
|
7.2
|
|
Mean
|
|
31.5
|
29.3
|
26.9
|
27.9
|
14.2
|
9.9
|
11.0
|
8.1
|
|
CS 2
|
Sb-C
|
Sb
|
C
|
Sb
|
C
|
Sb
|
C
|
Sb
|
C
|
| |
|
|
|
|
|
|
|
|
|
|
111
|
6
|
43.8
|
18.4
|
14.5
|
- - -
|
8.3
|
16.6
|
11.5
|
13.1
|
|
208
|
6
|
28.6
|
38.4
|
21.3
|
16.3
|
15.3
|
6.7
|
6.3
|
6.7
|
|
306
|
6
|
42.3
|
23.8
|
23.1
|
19.1
|
10.6
|
9.7
|
7.2
|
6.5
|
|
Mean
|
|
38.2
|
26.9
|
19.6
|
17.7
|
11.4
|
11.0
|
8.3
|
8.8
|
|
CS 3
|
Sb-W/r-C
|
Sb
|
W/rc
|
C
|
Sb
|
W/rc
|
C
|
Sb
|
W/rc
|
| |
|
|
|
|
|
|
|
|
|
|
102
|
8
|
15.1
|
4.8
|
2.9
|
10.3
|
6.9
|
7.6
|
11.6
|
12.1
|
|
209
|
8
|
6.8
|
14.4
|
20.1
|
25.3
|
10.9
|
17.6
|
20.7
|
11.5
|
|
305
|
8
|
10.3
|
5.7
|
9.0
|
14.3
|
9.1
|
11.0
|
15.9
|
16.2
|
|
Mean
|
|
10.7
|
8.3
|
10.7
|
16.6
|
9.0
|
12.0
|
16.0
|
13.3
|
|
CS 4
|
A-A-A-C
|
A
|
A
|
A
|
C
|
A
|
A
|
A
|
C
|
| |
|
|
|
|
|
|
|
|
|
|
105
|
12
|
15.4
|
10.8
|
10.4
|
14.8
|
6.9
|
4.5
|
8.7
|
5.1
|
|
207
|
12
|
49.7
|
38.7
|
26.1
|
28.1
|
12.3
|
10.7
|
13.2
|
8.6
|
|
309
|
12
|
7.3
|
8.3
|
13.3
|
14.7
|
9.1
|
13.0
|
11.0
|
4.2
|
|
Mean
|
|
24.1
|
19.3
|
16.6
|
19.2
|
9.4
|
9.4
|
11.0
|
6.0
|
|
CS 5
|
O/A-A-C
|
O/A
|
A
|
C
|
O/A
|
A
|
C
|
O/A
|
A
|
| |
|
|
|
|
|
|
|
|
|
|
104
|
14
|
21.3
|
21.4
|
18.4
|
21.1
|
10.7
|
10.7
|
8.7
|
7.7
|
|
213
|
14
|
2.2
|
2.8
|
3.3
|
2.2
|
2.9
|
2.0
|
2.6
|
4.7
|
|
314
|
14
|
63.2
|
30.0
|
16.1
|
- - -
|
13.7
|
7.0
|
10.4
|
17.1
|
|
Mean
|
|
28.9
|
18.1
|
12.6
|
11.7
|
9.1
|
6.5
|
7.2
|
9.8
|
|
CS 6
|
Rotational
Grazing
|
*
|
RG
|
RG
|
RG
|
RG
|
RG
|
RG
|
RG
|
| |
|
|
|
|
|
|
|
|
|
|
ls 2
|
|
31.1
|
2.1
|
2.3
|
2.8
|
0.9
|
Empty
|
0.1
|
|
|
ls 3
|
|
6.9
|
10.6
|
ND
|
4.2
|
6.8
|
Empty
|
- - -
|
|
|
|
|
|
|
|
|
|
|
|
|
* Red Clover/Grass removed as hay 1991, grazed 1992 - 1998
1 Check wells were too low to be sampled in fall of 1999 or
spring of 2000 due to dry condtions.
2 Check well #1 - 13 feet deep
3 Check well #2 - 28 feet deep
ND = no detection
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