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Errors Associated with the Use of Soil Survey Data for Estimating Plant-Available Water at a Regional Scale

^a Pacific Agric. and Agri-food Res. Ctr. (Agassiz), Agric. Canada Res. Branch, Soil Sci. Dep., Univ. of British Columbia, 139-2357 Main Mall, Vancouver, British Columbia, Canada V6T 1Z4
^b CDT Technologies, Richmond, British Columbia, Canada

View larger version (26K): [in a new window]   Fig. 1 Regression and comparison of measured water-holding capacity and estimated plant-available water (PAW) calculated using measured soil properties as inputs to the procedure from Ritchie (1986) for 70 sites. Plant-available water is expressed as volume fraction

View larger version (24K): [in a new window]   Fig. 2 Regression and comparison of measured water-holding capacity and estimated plant-available water (PAW) calculated using measured soil properties as inputs to the procedure from Ritchie et al. (2000) for 70 sites. Plant-available water is expressed as volume fraction. The estimation procedure is bound at 0.146 to avoid illogical results

View larger version (24K): [in a new window]   Fig. 3 Regression and comparison of measured and soil survey–derived particle size fractions for 70 sites

View larger version (29K): [in a new window]   Fig. 4 Regression and comparison of total plant-available water calculated using measured inputs and horizon thickness and of total plant-available water calculated using soil survey–derived inputs and horizon thickness. Both calculations were done using the estimation procedure for plant-available water from Ritchie et al. (2000)