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USDA-ARS North Appalachian Experimental Watershed, P.O. Box 478, Coshocton, OH 43812
*Corresponding author.
ABSTRACT
Leaching of NO3-N can be excessive under continuous corn (Zea mays L.) production. To reduce NO3-N losses, corn might be rotated with soybean [Glycine max (L.) Merr.], which does not require fertilizer N. Six large, undisturbed monolith lysimeters (8.1-m2 surface area, 2.4 m deep) were used to investigate NO3-N leaching in a 6-yr cornsoybean rotation study in eastern Ohio. Four lysimeters (Y103 A, B, C, and D) contained a moderately well-drained Keene silt loam (fine-silty, mixed, mesic Aquic Hapludalf) on a 6% slope, and two lysimeters (Y102 A and C) contained a well-drained Rayne silt loam on a 13% slope (fine-loamy, mixed, mesic Typic Hapludult). In the spring of each year, 224 kg N/ha as NH4NO3 was surface applied, and a rye (Secale cereale L.) winter cover crop was used following soybean. Nitrate-N levels in lysimeter percolate varied seasonally from 1 to 20 mg/L and on a 2-yr cycle, showing the influence of the crop rotation. The highest NO3-N levels usually occurred during the dormant season following corn. During the 6 yr of the study, the flow-weighted average NO3-N concentration in the percolate was 10.5 and 14.3 mg/L from the Y103 and Y102 lysimeters, respectively. Mean annual NO3-N losses in the percolate were 31.6 and 47.1 kg/ha, respectively. These NO3-N losses are smaller than losses from continuous corn production previously measured with the same lysimeters. Thus, a corn-soybean rotation may be one strategy for reducing NO3-N loading to groundwater.
Received for publication January 10, 1994.
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