Nitrogen content of soil 0.379252 Solar interception 0.398115 Sum of monthly Tavg where Tavg >=5 deg C 0.450168 Carbon content of soil 0.473313 Bulk density of soil 0.571867 Precipitation during the hottest quarter 0.625086 Precipitation during the driest quarter 0.686936 Precipitation during the wettest quarter 0.703825 Day/night diurnal temperature difference 0.710325 Precipitation during the coldest quarter 0.738586 Ratio of precipitation to potential evapotranspiration 0.789678 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 0.846723 Compound topographic index (relative wetness) 1.16691 Temperature during the hottest quarter 1.27008 Available water holding capacity of soil 1.45364 Temperature during the coldest quarter 2.58757