Carbon content of soil 0.744895 Sum of monthly Tavg where Tavg >=5 deg C 0.784091 Precipitation during the wettest quarter 0.872938 Nitrogen content of soil 0.898359 Day/night diurnal temperature difference 0.948532 Precipitation during the driest quarter 0.96885 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.84449 Available water holding capacity of soil 1.9626 Ratio of precipitation to potential evapotranspiration 2.15952 Bulk density of soil 2.39806 Temperature during the hottest quarter 2.50265 Compound topographic index (relative wetness) 2.58024 Precipitation during the hottest quarter 3.51924 Precipitation during the coldest quarter 3.98517 Temperature during the coldest quarter 4.00986 Solar interception 4.60288