Precipitation during the hottest quarter 0.370129 Precipitation during the coldest quarter 0.378403 Day/night diurnal temperature difference 0.386457 Carbon content of soil 0.391682 Sum of monthly Tavg where Tavg >=5 deg C 0.58579 Ratio of precipitation to potential evapotranspiration 0.660739 Nitrogen content of soil 0.736158 Precipitation during the wettest quarter 0.770325 Precipitation during the driest quarter 0.797069 Compound topographic index (relative wetness) 0.854162 Available water holding capacity of soil 0.95665 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.07263 Temperature during the coldest quarter 1.28321 Bulk density of soil 1.79396 Temperature during the hottest quarter 1.88795 Solar interception 4.02203