Solar interception 0.215676 Nitrogen content of soil 0.564818 Day/night diurnal temperature difference 0.788683 Bulk density of soil 0.832984 Precipitation during the wettest quarter 0.834599 Carbon content of soil 0.995179 Available water holding capacity of soil 1.08721 Sum of monthly Tavg where Tavg >=5 deg C 1.11549 Precipitation during the driest quarter 1.24581 Temperature during the hottest quarter 1.69877 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.949 Temperature during the coldest quarter 2.2265 Compound topographic index (relative wetness) 2.75697 Precipitation during the coldest quarter 3.47651 Precipitation during the hottest quarter 3.89263 Ratio of precipitation to potential evapotranspiration 4.31358