Solar interception 0.196713 Nitrogen content of soil 0.427038 Carbon content of soil 0.579628 Sum of monthly Tavg where Tavg >=5 deg C 0.600044 Precipitation during the driest quarter 0.63221 Ratio of precipitation to potential evapotranspiration 0.716984 Precipitation during the coldest quarter 0.747361 Precipitation during the wettest quarter 0.806875 Bulk density of soil 0.949298 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.05699 Precipitation during the hottest quarter 1.13317 Day/night diurnal temperature difference 1.18207 Compound topographic index (relative wetness) 1.22773 Temperature during the hottest quarter 1.92261 Available water holding capacity of soil 2.00341 Temperature during the coldest quarter 3.81283