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a University of Minnesota Southern Research and Outreach Center, 35838 120th Street, Waseca, MN 56093-4521
b Dow AgroSciences, 750 Double Spring Road, Almond, NC 28702
* Corresponding author (grandall{at}soils.umn.edu).
Received for publication May 27, 2002. Subsurface drainage, a water management practice used to remove excess water from poorly drained soils, can transport substantial amounts of NO3 from agricultural crop production systems to surface waters. A field study was conducted from the fall of 1986 through 1994 on a tile-drained Canisteo clay loam soil (fine-loamy, mixed, superactive, calcareous, mesic Typic Endoaquoll) to determine the influence of time of N application and use of nitrapyrin [NP; 2-chloro-6-(trichloromethyl) pyridine] on NO3 losses from a corn (Zea mays L.)–soybean [Glycine max (L.) Merr.] rotation. Four anhydrous ammonia treatments [fall N, fall N + NP, spring preplant N, and split N (40% preplant and 60% sidedress)] were replicated four times and applied at 150 kg N ha-1 for corn on individual drainage plots. Sixty-two percent of the annual drainage and 69% of the annual NO3 loss occurred in April, May, and June. Flow-weighted NO3–N concentrations in the drainage water were two to three times greater in the two years following the three-year dry period compared with preceding and succeeding years. Nitrate N concentrations and losses in the drainage from corn were greatest for fall N with little difference among the other three N treatments. Nitrate losses from soybean were affected more by residual soil NO3 following corn than by the N treatments per se. Averaged across the four rotation cycles, flow-normalized NO3–N losses ranked in the order: fall N > split N > spring N = fall N + NP. Under these conditions NO3 losses from a corn–soybean rotation into subsurface drainage can be reduced by 13 to 18% by either applying N in the spring or using NP with late fall–applied ammonia.
Abbreviations: ET, evapotranspiration • NP, nitrapyrin • RSN, residual soil nitrate nitrogen
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