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 Table 1.1.5. Background Runoff Concentrations of
Total Phosphorus and Chemical Oxygen Demand For
Rural Land Uses.
P
COD
Source
(mg/l)
(mg/l)
Native Prairie1
0.2
49
Corn2
0.9
Continuous Corn 3
1.1
Native Grass4
0.1
31
Wheat5
1.4
Pasture 5
1.0
Alfalfa5
2.1
Corn6
0.3
Soybeans6
0.5
Small Grain6
0.6
Cropped Watershed6
0.7
59
Road ditches draining
144
cropped land6
Forest6
0.2
78
Soybeans7
1.5
1
Timmons and Holt, 1977
2
Young and Holt, 1977
3
Burwell et at., 1975
4
Crow et al., 1979
5
Olness et al., 1975
6
Young, R.A., Unpublished data, Morris, MN
7
Logan and Stiefel, 1979
(after Young et al., 1982)
A COD to BOD conversion ratio of 4.57 + 1.15 SD may be employed depending on the type
of operation and the animal feeding ration for feedlots in northern states (Young et al., 1982).
1.1-25
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