A monolithic weighing lysimeter for characterizing the fate and transport of agricultural chemicals in soils
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Four monolithic weighing lysimeters (1.83 in × 1.83 in × 1.52 m deep) were installed at Kansas State University in 1994 with undisturbed soils from two different locations in Kansas. The soil tanks were constructed with 6.4-mm (0.25-in.) thick metal plate, instrumented with solute suction tubes, drain tubes, tensiometers, thermocouples, and neutron probe access tubes; and installed on load cells. A tipping bucket rain gauge was installed to monitor precipitation at the site. Load cells, thermocouples, and the rain gauge were connected to a datalogger and measurements were read automatically through a computer-telephone network system. Herbicides and fertilizers were applied at conventional rates for corn during 1995-1997. Weekly water samples collected from different depths of the lysimeters were analyzed for atrazine and nitrate-N concentrations. Soil moisture contents were measured using a neutron probe and tensiometers. During three years of chemical transport investigation, the system effectively characterized the fate and transport of agricultural chemicals in soils. This system will be utilized to collect several more years of chemical transport data for developing and validating predictive models of chemical leaching through soils.
author list (cited authors)
Kalita, P. K., Kluitenberg, G. J., Barnes, P. L., Schwab, A. P., Koelliker, J. K., Steichen, J. M., ... Oard, D. L.