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Fig. 6. (Left) Data of water content from the TDR system in soil B versus output (V) from the PR1/6 for Soil B. Data from the wet end are from warm summer days (Days 207 and 212) plot well to the right of those from cool winter days, indicating that output from the PR1/6 is increasing with soil temperature. In contrast, on the dry end data from warm summer days (Days 199 and 201) plots in the same location as those from cold winter days. Except for Days 199, 201, 207, and 212, all data shown were acquired between Days 2 and 67 of 2001. (Right) Calibrations for Soils A and B combined and for Soil C when Days 207 and 212, 2002 are omitted, compared with the factory calibration.
