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Department of Agricultural Engineering, Cornell Univ., Ithaca, NY 14853-5701;
USDA-ARS, U.S. Dairy Forage Research Center, Madison, WI 53706.
* Corresponding author.
ABSTRACT
Preferred movement of chloride and nitrate during runoff events following nutrient application was studied experimentally on 109 m long fields with a hard pan at shallow depth near Ithaca, NY. Chloride and nitrate applications were surface-applied and incorporated at 36 and 69 m uphill from the collection point. All of the applied chemicals, when surface-applied on saturated soil, were completely lost in the surface runoff and interflow water. When incorporated, at most 60% of the mass applied was lost. The fraction lost appeared to be related to the initial moisture content of the soil. After a chemical application, the concentration in both runoff and interflow was initially high and then decreased exponentially. The concentrations in the runoff water, interflow, and macropores were approximately equal throughout a runoff event.
Contribution from the Dep. of Agric. Eng., Cornell Univ. and U.S. Dairy Forage Res. Ctr.
Received for publication June 30, 1986.
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