Solar interception 0.175895 Precipitation during the wettest quarter 0.275946 Nitrogen content of soil 0.563337 Carbon content of soil 0.586081 Precipitation during the driest quarter 0.735647 Bulk density of soil 0.742243 Day/night diurnal temperature difference 0.959334 Sum of monthly Tavg where Tavg >=5 deg C 0.963258 Precipitation during the coldest quarter 1.15884 Precipitation during the hottest quarter 1.21068 Available water holding capacity of soil 1.23037 Temperature during the hottest quarter 1.35403 Ratio of precipitation to potential evapotranspiration 1.52375 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.76525 Compound topographic index (relative wetness) 1.96879 Temperature during the coldest quarter 3.23114