Quantcast Table 1.1.6. Background Runoff Concentrations For Total Nitrogen From Rural Land Uses

 
  
 
Table 1.1.6. Background Runoff Concentrations For Total Nitrogen From Rural Land Uses.
Total Nitrogen Concentration
Source
Reference
(mg/l)
Native prairieMinnesota
5
Timmons and Holt (1977)
Native prairie-Oklahoma
9
Crow et al. (1979)
Continuous corn-Minnesota
91
Young and Holt (1977)
Rotation corn-Minnesota
44
Young and Holt (1977)
Continuous corn-Minnesota
131
Burwell et al. (1975)
Wheat-Oklahoma
2
Olness et al. (1975)
Oats-Minnesota
49
Burwell et al. (1975)
Rotation pasture-Oklahoma
2
Olness et al. (1975)
Continuous pasture-Oklahoma
3
Olness et al. (1975)
Alfalfa-Oklahoma
4
Olness et al. (1975)
Alfalfa-Minnesota
60
Burwell et al. (1975)
Fallow-Minnesota
186
Burwell et al. (1975)
Aspen-birch forest-Minnesota
0
Timmons and Holt (1977)
(after Young et al., 1987)
Reduction in animal waste pollutant concentrations in runoff moving as overland flow through a
vegetative buffer is calculated below from regression models determined from field measurement studies
(Young et al., 1982).
Dc1
= -27.9 + 42.8 log Tc
(1.1.28)
Dp1 = -49.3 + 50.5 log Tc
(1.1.29)
DN1 = -16.8 + 42.3 log Tc
(1.1.30)
Where:
Dc1 = percent reduction in COD concentration
(if < 0, Dc1 = 0)
Dp1 = percent reduction in TP concentration
(if < 0, Dp1 = 0)
1.1-26

 


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