Carbon content of soil 0.886968 Nitrogen content of soil 1.00366 Sum of monthly Tavg where Tavg >=5 deg C 1.02746 Day/night diurnal temperature difference 1.11429 Precipitation during the driest quarter 1.22325 Precipitation during the wettest quarter 1.28207 Integer number of consecutive months where Tavg >= 5 deg C (Length of potential growing season) 1.81508 Ratio of precipitation to potential evapotranspiration 2.15952 Bulk density of soil 2.35947 Available water holding capacity of soil 2.42935 Compound topographic index (relative wetness) 2.58024 Temperature during the hottest quarter 3.36099 Precipitation during the hottest quarter 3.51924 Precipitation during the coldest quarter 4.0095 Solar interception 4.60288 Temperature during the coldest quarter 5.31809