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SULFUR LEACHING AND LYSIMETER CHARACTERIZATION

Radiotracer studies of sulfur leaching from lysimeters in grazed pastures have shown that there was very little leaching of applied sulfur in spite of apparent total sulfur losses of 25 kg S/ha/yr. Over the range of stocking rates used, there were no significant differences in the amounts of water and sulfur recovered from the lysimeters. Uneven flows were detected in the lysimeters and, as well as emphasizing the need for caution in the use of lysimeters in the field, it is suggested that these uneven flows can be measured and used to “characterize” individual lysimeters. “Characterization” could lead to savings in the costs of replication and in construction of the very large lysimeters needed to avoid serious edge effects.