Nitrogen content of soil 0.996538 Sum of monthly Tavg where Tavg >=5 deg C 1.03499 Carbon content of soil 1.09332 Precipitation during the driest quarter 1.24229 Day/night diurnal temperature difference 1.40123 Precipitation during the wettest quarter 1.48525 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.77326 Bulk density of soil 2.1896 Ratio of precipitation to potential evapotranspiration 2.19022 Compound topographic index (relative wetness) 2.57937 Available water holding capacity of soil 2.60536 Temperature during the hottest quarter 3.64176 Precipitation during the hottest quarter 3.6687 Precipitation during the coldest quarter 4.0095 Solar interception 4.60288 Temperature during the coldest quarter 5.61585