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Soil Water Components Based on Capacitance Probes in a Sandy Soil

^a University of Florida, IFAS, Citrus Research and Education Center, 700 Experiment Station Rd., Lake Alfred, FL 33850 USA
^b USDA-ARS-PWA, 24106 N. Bunn Rd., Prosser, WA 99350 USA

View larger version (30K): [in a new window]   Fig. 1 Daily (A) rainfall and (B) irrigation events during 1997 for the study site

View larger version (25K): [in a new window]   Fig. 2 Schematic of the location of sprinkler and the EnviroSCAN capacitance probe under the tree canopy

View larger version (29K): [in a new window]   Fig. 3 Schematic of multiple EnviroSCAN capacitance probes layout in the field

View larger version (22K): [in a new window]   Fig. 4 A sample data showing (A and B) soil water content at each depth and (C) depth-integrated water content within the root zone (0–40 cm) and below the root zone (40–110 cm) of 4-yr-old Hamlin orange trees on a Swingle citrumelo rootstock in a Candler fine sand

View larger version (13K): [in a new window]   Fig. 5 Flow chart explaining the steps taken during the calculation of ET, drainage, and storage variations through the soil profile

View larger version (46K): [in a new window]   Fig. 6 Depth-integrated soil water content (A) within and (B) below the root zone and for (C) the entire monitored soil profile depth during 1997. The refill points indicate the soil water content at which irrigation was scheduled to replenish the water deficit. The allowable depletion of the available soil water (ASW) was 33% in February to June, and 67% during the rest of the year

View larger version (38K): [in a new window]   Fig. 7 Calculated daily mean, standard deviation, and cumulative mean values of water drainage below the root zone of 4-yr-old Hamlin orange trees on Swingle citrumelo rootstock grown in a Candler fine sand during 1997

View larger version (49K): [in a new window]   Fig. 8 Calculated daily mean, standard deviation, and cumulative values of evapotranspiration for 4-yr-old Hamlin orange trees on Swingle citrumelo rootstock grown in a Candler fine sand during 1997

View larger version (22K): [in a new window]   Fig. 9 Linear regression analysis between calculated daily evapotranspiration and potential evapotranspiration for 4-yr-old Hamlin orange trees on Swingle citrumelo rootstock grown in a Candler fine sand during 1997. SEC is standard error coefficient