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A Functional Approach to Soil Characterization in Support of Precision Agriculture

Lab. of Soil Science and Geology, Wageningen Univ. and Research Center, P.O. Box 37, 6700 AA Wageningen, The Netherlands

View larger version (31K): [in a new window]   Fig. 1 Measured () and simulated (—) soil moisture contents. Measurements were collected from three winter wheat fields (Sites 1–3) during the 1997 growing season

View larger version (16K): [in a new window]   Fig. 2 Measured () and simulated (—) soil N contents. Measurements were collected from a winter wheat field during the 1998 growing season

View larger version (12K): [in a new window]   Fig. 3 Validity measures calculated for the fuzzy c-means classifications in Fields A and B

View larger version (51K): [in a new window]   Fig. 4 Soil sampling sites in Field A; spatial distribution of class-membership values; CI-map reflecting spatial uncertainty of class-membership; soil functional units with representative soil profiles

View larger version (46K): [in a new window]   Fig. 5 Soil sampling sites in Field B; spatial distribution of class-membership values; CI-map reflecting spatial uncertainty of class-membership; soil functional units with representative soil profiles

View larger version (20K): [in a new window]   Fig. 6 Simulated soil-N concentrations and weekly N-uptake rates used to optimize N-fertilization in a soil functional unit during 1998