Precipitation during the hottest quarter 0.36061 Nitrogen content of soil 0.71385 Available water holding capacity of soil 0.730845 Precipitation during the coldest quarter 0.802144 Compound topographic index (relative wetness) 1.00282 Sum of monthly Tavg where Tavg >=5 deg C 1.09182 Precipitation during the driest quarter 1.11399 Precipitation during the wettest quarter 1.21484 Temperature during the coldest quarter 1.36178 Ratio of precipitation to potential evapotranspiration 1.50819 Solar interception 1.50972 Elevation 1.60302 Temperature during the hottest quarter 2.05877 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 2.76485 Carbon content of soil 3.48531 Day/night diurnal temperature difference 4.23536 Bulk density of soil 4.32738