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A Method to Predict Soil Saturation Frequency and Duration from Soil Color

^a Dep. of Soil Science, Box 7619, North Carolina State University, Raleigh, NC 2795
^b Dep. of Biological and Agricultural Engineering, Box 7625, North Carolina State University, Raleigh, NC 27695

View larger version (16K): [in a new window]   Fig. 1. Schematic map of site showing all plot locations. Distances of transects from the perimeter ditch ranged from 7 to 80 m (modified from Hayes and Vepraskas, 2000).

View larger version (14K): [in a new window]   Fig. 2. Average daily soil temperatures in the Goldsboro (G), Lynchburg (L), Rains (R), and Pantego (P) plots.

View larger version (26K): [in a new window]   Fig. 3. Variation in redox potential (EH) over time for Plot 2R at a depth of 30 cm. Mean and range in EH is shown as determined from five electrodes at this depth. The data were used to determine the time required for the mean EH value to fall to where Fe reduction would occur following a saturation event. In this example, the soil had a high mean EH before December 25, and it required 21 d of saturation before the mean EH value fell into the level where Fe reduction was expected.

View larger version (22K): [in a new window]   Fig. 4. Regression lines and data points for the relationship between the average number of saturation events (NSEs) during the growing season and the percentage of redox depletions. The data show that linear relationships are justified for all depths.

View larger version (19K): [in a new window]   Fig. 5. Relationships between average number of saturation events (NSEs) and percentage of redox depletions for the periods covering the entire year and outside the growing season. Data were obtained from all plots at the site.