Lysimeter and Field Measurements of Chloride and Bromide Leaching in an Uncultivated Loamy Sand1
- P. G. Saffigna,
- D. R. Keeney and
- C. B. Tanner2
Field and lysimeter measurements were made of Cl and Br leaching in a Plainfield loamy sand at Hancock, Wisconsin. Chloride and Br were excellent companion tracers, moving in a 1:1 ratio through the 500-cm field profile to the water table even when large differences in halide leaching occurred between adjacent sites. Half of the Cl or Br applied to the lysimeters was leached through the 125-cm lysimeter profile in 13 or 17 cm of drainage during 22- and 205-day experiments, respectively. Edge effects in the lysimeter were studied by applying Br near the edge and Cl in the center. Bromide was detected in the lysimeter drainage before Cl, but overall, edge effects were small.
Lateral movement of Cl and Br in the lysimeter profile was < 20 cm. This helps explain why large localized variations in solute transport can persist to considerable depth in this sandy soil. The differences in the distribution of halide between adjacent soil profiles within the lysimeter and field exceeded the average differences between the field and the lysimeter soil profiles.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © .