What question did this study set out to answer?

To determine the influence of nitrogen application timing and the nitrification inhibitor nitrapyrin on nitrate losses in subsurface drainage from a corn–soybean crop rotation.

September 1, 2003Journal of Environmental Quality

Nitrate Losses in Subsurface Drainage from a Corn–Soybean Rotation as Affected by Time of Nitrogen Application and Use of Nitrapyrin

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Authors

GRG. W. RandallUniversity of Minnesota, Waseca JVJeffrey A. VetschUniversity of Minnesota JHJesse HuffmanCanadian Institute for Public Safety Research and Treatment

Discussion

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Implication

Field experiment reveals spring nitrogen application and nitrapyrin reduce nitrate leaching in corn-soybean rotations, indicating improved water protection through optimized management.

Key Points

To determine the influence of nitrogen application timing and the nitrification inhibitor nitrapyrin on nitrate losses in subsurface drainage from a corn–soybean crop rotation.
Conducted an eight-year field study (fall 1986 through 1994) on tile-drained Canisteo clay loam soil in a corn-soybean rotation.
Evaluated four replicated anhydrous ammonia treatments applied at 150 kg N ha⁻¹ for corn: fall N, fall N + nitrapyrin, spring preplant N, and split N (40% preplant, 60% sidedress).
Flow-normalized nitrate-N losses across four rotation cycles ranked in the order: fall N > split N > spring N = fall N + nitrapyrin.
Applying nitrogen in spring or adding nitrapyrin to late fall-applied ammonia reduced nitrate losses in subsurface drainage by 13% to 18% compared to fall application alone.
Subsurface drainage during April, May, and June accounted for 62% of annual drainage volume and 69% of total annual nitrate loss.

Cite This Study

Randall et al. (2003) studied this question.

synapsesocial.com/papers/6a705ef0b27f15817827537d https://doi.org/10.2134/jeq2003.1764

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Implication

Field experiment reveals spring nitrogen application and nitrapyrin reduce nitrate leaching in corn-soybean rotations, indicating improved water protection through optimized management.

Nitrate Losses in Subsurface Drainage from a Corn–Soybean Rotation as Affected by Time of Nitrogen Application and Use of Nitrapyrin

Discussion

Member takes

Implication

Key Points

Cite This Study

Nitrate Losses in Subsurface Drainage from a Corn–Soybean Rotation as Affected by Time of Nitrogen Application and Use of Nitrapyrin

Discussion

Member takes

Implication

Key Points

Cite This Study

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