Nitrogen content of soil 0.612274
Carbon content of soil 0.618269
Sum of monthly Tavg where Tavg >=5 deg C 0.704572
Precipitation during the coldest quarter 0.759117
Precipitation during the wettest quarter 0.792277
Ratio of precipitation to potential evapotranspiration 0.906576
Precipitation during the driest quarter 0.953237
Precipitation during the hottest quarter 1.13485
Bulk density of soil 1.14287
Temperature during the coldest quarter 1.17958
Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.25191
Available water holding capacity of soil 1.25853
Compound topographic index (relative wetness) 1.38512
Day/night diurnal temperature difference 1.39396
Temperature during the hottest quarter 1.83706
Solar interception 2.94631