Predictor Importance Values for pecan (Carya illinoinensis)

Predictor Name	Importance Score	Rank
Annual precipitation (mm)	20.39	1
Mean May-September precipitation (mm)	8.59	39
Mean annual temperature (°C)	15.97	6
Mean May-September temperature (°C)	11.72	24
Mean temperature of coldest month (°C)	13.84	12
Mean temperature of warmest month (°C)	11.11	27
Annual aridity index	12.54	18
Minimum elevation	12.11	20
Maximum elevation	15.71	7
Average elevation	12.79	15
Median elevation	13.42	14
Range of elevation	17.04	3
Elevation coefficient ofvariation	16.86	4
Elevation standard deviation	12.68	16
Annual daylength coefficient of variation	15.19	8
Total available water capacity (cm, to 150 cm)	14.37	11
Total available water supply (cm, to 150 cm)	12.26	19
Depth to water table (cm)	9.98	33
Soil permeability rate (cm/hr)	9.63	35
Soil calcium carbonate (% by weight)	14.62	10
Soil cation-exchange capacity	11.75	23
Soil pH	16.74	5
Soil bulk density (g/cm3)	17.69	2
Organic matter content (% by weight)	9.41	37
Potential soil productivity	12.56	17
Soil erodibility factor, rock fragment free	9.52	36
Soil erosion by wind (tons/acre/year)	10.62	29
Percent soil passing sieve No. 10 (coarse)	11.53	26
Percent soil passing sieve No. 200 (fine)	5.74	43
Percent clay (< 0.002 mm size)	10.29	30
Percent sand (< 0.002 mm size)	11.8	22
Percent silt (< 0.002 mm size)	10.22	31
Percent of texture clayey	9.05	38
Percent of texture loamy	9.64	34
Percent of texture sandy	11.04	28
Percent of texture other	14.98	9
Alfisol (%)	13.63	13
Aridisol (%)	3.05	45
Entisol (%)	8.13	40
Histosol (%)	7.56	42
Inceptisol (%)	10.19	32
Mollisol (%)	11.62	25
Spodosol (%)	5.29	44
Ultisol (%)	7.91	41
Vertisol (%)	11.95	21