Solar interception 0.057463 Nitrogen content of soil 0.368504 Sum of monthly Tavg where Tavg >=5 deg C 0.421009 Precipitation during the hottest quarter 0.430356 Bulk density of soil 0.448919 Carbon content of soil 0.482745 Precipitation during the coldest quarter 0.5231 Precipitation during the driest quarter 0.640779 Precipitation during the wettest quarter 0.701212 Day/night diurnal temperature difference 0.705681 Ratio of precipitation to potential evapotranspiration 0.805333 Compound topographic index (relative wetness) 1.10087 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.29426 Temperature during the hottest quarter 1.5821 Available water holding capacity of soil 1.63019 Temperature during the coldest quarter 4.70013