Solar interception 0.079477 Precipitation during the wettest quarter 0.121656 Nitrogen content of soil 0.332349 Carbon content of soil 0.40516 Precipitation during the driest quarter 0.47882 Precipitation during the coldest quarter 0.521844 Temperature during the hottest quarter 0.53991 Precipitation during the hottest quarter 0.546388 Bulk density of soil 0.550054 Sum of monthly Tavg where Tavg >=5 deg C 0.571146 Ratio of precipitation to potential evapotranspiration 0.660739 Day/night diurnal temperature difference 0.675033 Available water holding capacity of soil 0.79199 Compound topographic index (relative wetness) 0.921276 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.53833 Temperature during the coldest quarter 1.75635