Solar interception 0.06626 Nitrogen content of soil 0.512604 Precipitation during the wettest quarter 0.643667 Carbon content of soil 0.66421 Bulk density of soil 0.671416 Available water holding capacity of soil 0.816821 Day/night diurnal temperature difference 0.868033 Precipitation during the driest quarter 0.91069 Temperature during the hottest quarter 0.927 Sum of monthly Tavg where Tavg >=5 deg C 0.952098 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.61104 Compound topographic index (relative wetness) 2.88735 Temperature during the coldest quarter 3.21434 Precipitation during the coldest quarter 3.40611 Precipitation during the hottest quarter 3.54524 Ratio of precipitation to potential evapotranspiration 4.31056