Skip to main content
. 2012 Nov 30;111(3):178–186. doi: 10.1016/j.jenvman.2012.06.030

Table 2.

Summary statistics.

Variables Observations Time period Mean Standard deviation Min Max
Nitrate 15,423 1992–2008 20.62 28.69 0.00 801.21
Precip 14,169 1975–2007 2.78 1.30 0.96 10.84
Temp 14,169 1975–2007 12.58 2.65 3.22 23.54
Landuse_oilseed & protein 9974 1999–2008 0.03 0.04 0.00 0.33
Landuse_forage crops 7856 1999–2008 0.04 0.04 0.00 0.61
Landuse_cereal & maize 7856 1999–2008 0.19 0.21 0.00 3.57
Landuse_row crops & veg 7856 1999–2008 0.02 0.05 0.00 0.80
PropAL 9974 1999–2008 0.46 0.31 0.00 5.20
Farming_system 9228 1999–2008 1.87 0.21 1.00 2.00
Landcover_grassland 1087 Time constant 0.09 0.13 0.00 0.79
Landcover_cropland 1087 Time constant 0.24 0.29 0.00 0.97
Landcover_buildings 1087 Time constant 0.09 0.12 0.00 0.98
Landcover_forest 1087 Time constant 0.45 0.28 0.00 0.96
fwc 1087 Time constant 0.38 0.04 0.27 0.47
vs 1087 Time constant 8.63 4.07 1.00 15.00
Nbal 4870 2003–2007 39.99 24.05 −28.24 143.69
Fert 4870 2003–2007 99.20 42.98 0.08 181.92
Withd 4870 2003–2007 99.76 29.88 0.02 172.61