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Variations in Tension Lysimeter Leachate Volumes¹

ABSTRACT

Leachate volumes collected with tension plate lysimeters placed in a glacial outwash soil and maintained at a fixed tension varied from 1.9–629.9% of the total water applied through rainfall and/or irrigation. The amounts of K passing through plates at depths of 152 cm ranged from 0.02–86.1% of that applied at the surface. These differences were attributed to several factors including (i) nonuniform application of water, (ii) large differences in soil moisture retention and flow properties for individual strata, and (iii) irregularity of soil strata arrangement at different locations within the study area. Lateral flow to plate surfaces can result in large overestimates of the nutrient flux at a given soil depth.

¹ Contribution from the Department of Silviculture, State University College of Forestry at Syracuse University, Syracuse, N.Y. Financial assistance from National Science Foundation, GB-1279, GB-2396 and GB-6178 is gratefully acknowledged. Presented before Div. S-7, Soil Science Society of America, Nov. 6, 1967, at Wash., D.C.

² Soil Scientist, US Forest Service, Pacific Northwest Forest and Range Experiment Station, Portland, Oregon; Graduate Fellow in Soils, University of California at Berkeley; Professor of Silviculture, State University College of Forestry at Syracuse University. Work done while G.M.M. was Graduate Research Fellow in Silviculture and P.H.C. was Assistant Professor of Silviculture, State University College of Forestry at Syracuse University.

Received for publication May 15, 1969. Accepted for publication October 24, 1969.

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