The DOI matches its Crossref record.
Fertilizer Nitrogen: Contribution to Nitrate in Surface Water in a Corn Belt Watershed
Abstract
Measurements of nitrate concentration and relative enrichment in nitrogen-15 were made on samples of the surface waters of a typical Illinois corn belt watershed and the effluent of the subterranean tiles that drain the cropped land in the region. From these measurements, we estimate that at the time of peak nitrate concentration in the spring of 1970 a minimum of 55 to 60 percent of the nitrogen found as nitrate in the surface waters of this watershed originated from fertilizer nitrogen.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cited by
Atmospheric nitrogen is a reliable standard for natural 15N abundance measurements
Mariotti, A. (1983) · Nature · doi:10.1038/303685a0 · Cited by 908
Zhang, Y., Shi, P., Song, J., & Li, Q. (2018) · Applied Sciences · doi:10.3390/app9010018 · Cited by 121
Using15N to determine a budget for effluent-derived nitrogen applied to forest
Tozer, W. C., Wilkins, K. J., Wang, H., van den Heuvel, M., Charleson, T., & Silvester, W. B. (2005) · Isotopes in Environmental and Health Studies · doi:10.1080/10256010500053649 · Cited by 7
Metadata
- Authors
- Kohl, D. H., Shearer, G. B., & Commoner, B.
- Venue
- Science
- Published
- 1971-12-24
- Volume
- 174
- Issue
- 4016
- Pages
- 1331-1334
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2058139107
- Cited by
- 297
- References
- 0
- FWCI
- 5.94
- Type
- journal article
- Language
- en
- Open access
- closed
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Fertilizer Nitrogen: Contribution to Nitrate in Surface Water in a Corn Belt Watershed. https://app.cochat.ai/papers/10.1126/science.174.4016.1331
- The paper
- Kohl, D. H., Shearer, G. B., & Commoner, B. (1971). Fertilizer Nitrogen: Contribution to Nitrate in Surface Water in a Corn Belt Watershed. Science. https://doi.org/10.1126/science.174.4016.1331
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.