John E. Sawyer

6.6k total citations · 1 hit paper
200 papers, 4.5k citations indexed

About

John E. Sawyer is a scholar working on Agronomy and Crop Science, Soil Science and Plant Science. According to data from OpenAlex, John E. Sawyer has authored 200 papers receiving a total of 4.5k indexed citations (citations by other indexed papers that have themselves been cited), including 96 papers in Agronomy and Crop Science, 89 papers in Soil Science and 60 papers in Plant Science. Recurrent topics in John E. Sawyer's work include Crop Yield and Soil Fertility (84 papers), Soil Carbon and Nitrogen Dynamics (79 papers) and Soil and Water Nutrient Dynamics (54 papers). John E. Sawyer is often cited by papers focused on Crop Yield and Soil Fertility (84 papers), Soil Carbon and Nitrogen Dynamics (79 papers) and Soil and Water Nutrient Dynamics (54 papers). John E. Sawyer collaborates with scholars based in United States, Australia and Ecuador. John E. Sawyer's co-authors include Daniel W. Barker, Michael J. Castellano, Daniel C. Olk, Antonio P. Mallarino, Johan Six, Kevin E. Mueller, Emerson D. Nafziger, John Lundvall, Krishna P. Woli and Mahdi Al‐Kaisi and has published in prestigious journals such as Nature Communications, Environmental Science & Technology and PLoS ONE.

In The Last Decade

John E. Sawyer

189 papers receiving 4.3k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Integrating plant litter quality, soil organic matter stabilization, and the carbon saturation concept

2015 526 citations Michael J. Castellano, Daniel C. Olk et al. profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
John E. Sawyer United States	37	2.5k	1.6k	1.5k	1.3k	854	200	4.5k
Brian J. Wienhold United States	38	3.2k 1.3×	1.5k 0.9×	1.1k 0.8×	1.1k 0.9×	796 0.9×	116	5.1k
Emerson D. Nafziger United States	40	1.9k 0.7×	2.4k 1.5×	1.7k 1.1×	887 0.7×	570 0.7×	136	4.4k
D. W. Reeves United States	34	3.4k 1.3×	2.2k 1.4×	1.9k 1.3×	954 0.7×	738 0.9×	110	5.3k
David R. Huggins United States	37	2.4k 0.9×	1.8k 1.1×	1.2k 0.8×	1.0k 0.8×	1.2k 1.4×	131	4.9k
Harold M. van Es United States	40	2.7k 1.1×	1.4k 0.9×	918 0.6×	1.1k 0.8×	600 0.7×	147	4.9k
Michel A. Cavigelli United States	34	2.0k 0.8×	1.9k 1.1×	912 0.6×	831 0.6×	1.4k 1.7×	90	4.5k
R. L. Mulvaney United States	36	2.9k 1.1×	1.7k 1.0×	988 0.7×	1.8k 1.4×	1.0k 1.2×	107	5.1k
Steve W. Culman United States	36	2.5k 1.0×	1.6k 1.0×	1.2k 0.8×	918 0.7×	1.0k 1.2×	95	4.7k
Jorge A. Delgado United States	38	2.6k 1.0×	1.7k 1.0×	963 0.6×	1.5k 1.2×	940 1.1×	125	5.1k
Michelle M. Wander United States	39	3.8k 1.5×	1.2k 0.7×	985 0.7×	1.3k 1.0×	1.2k 1.4×	94	5.5k

Countries citing papers authored by John E. Sawyer

Since Specialization

Citations

This map shows the geographic impact of John E. Sawyer's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by John E. Sawyer with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John E. Sawyer more than expected).

Fields of papers citing papers by John E. Sawyer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John E. Sawyer. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by John E. Sawyer. The network helps show where John E. Sawyer may publish in the future.

Co-authorship network of co-authors of John E. Sawyer

This figure shows the co-authorship network connecting the top 25 collaborators of John E. Sawyer. A scholar is included among the top collaborators of John E. Sawyer based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with John E. Sawyer. John E. Sawyer is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Baum, Mitchell, John E. Sawyer, Emerson D. Nafziger, et al.. (2025). The optimum nitrogen fertilizer rate for maize in the US Midwest is increasing. Nature Communications. 16(1). 404–404. 11 indexed citations

Thorburn, Peter J., J. S. Biggs, Laila A. Puntel, et al.. (2024). The nitrogen fertilizer conundrum: why is yield a poor determinant of crops’ nitrogen fertilizer requirements?. Agronomy for Sustainable Development. 44(2). 13 indexed citations

Ransom, Curtis J., Newell R. Kitchen, James J. Camberato, et al.. (2023). Combining corn N recommendation tools for an improved economical optimal nitrogen rate estimation. Soil Science Society of America Journal. 87(4). 902–917. 7 indexed citations

Shao, Hui, Yuxin Miao, Fabián G. Fernández, et al.. (2023). Evaluating Critical Nitrogen Dilution Curves for Assessing Maize Nitrogen Status across the US Midwest. Agronomy. 13(7). 1948–1948. 6 indexed citations

Li, Dan, Yuxin Miao, Curtis J. Ransom, et al.. (2022). Corn Nitrogen Nutrition Index Prediction Improved by Integrating Genetic, Environmental, and Management Factors with Active Canopy Sensing Using Machine Learning. Remote Sensing. 14(2). 394–394. 35 indexed citations

Bean, G. Mac, Curtis J. Ransom, Newell R. Kitchen, et al.. (2021). Soil hydrologic grouping guide which soil and weather properties best estimate corn nitrogen need. Agronomy Journal. 113(6). 5541–5555. 6 indexed citations

Ransom, Curtis J., Jason D. Clark, G. Mac Bean, et al.. (2021). Data from a public–industry partnership for enhancing corn nitrogen research. Agronomy Journal. 113(5). 4429–4436. 7 indexed citations

Ransom, Curtis J., Newell R. Kitchen, John E. Sawyer, et al.. (2021). Improving publicly available corn nitrogen rate recommendation tools with soil and weather measurements. Agronomy Journal. 113(2). 2068–2090. 14 indexed citations

Clark, Jason D., Fabián G. Fernández, Kristen S. Veum, et al.. (2020). Adjusting corn nitrogen management by including a mineralizable‐nitrogen test with the preplant and presidedress nitrate tests. Agronomy Journal. 112(4). 3050–3064. 5 indexed citations

10.

Clark, Jason D., Fabián G. Fernández, James J. Camberato, et al.. (2020). Weather and soil in the US Midwest influence the effectiveness of single‐ and split‐nitrogen applications in corn production. Agronomy Journal. 112(6). 5288–5299. 19 indexed citations

11.

Clark, Jason D., Kristen S. Veum, Fabián G. Fernández, et al.. (2020). Soil sample timing, nitrogen fertilization, and incubation length influence anaerobic potentially mineralizable nitrogen. Soil Science Society of America Journal. 84(2). 627–637. 10 indexed citations

12.

Clark, Jason D., Fabián G. Fernández, Kristen S. Veum, et al.. (2020). Soil‐nitrogen, potentially mineralizable‐nitrogen, and field condition information marginally improves corn nitrogen management. Agronomy Journal. 112(5). 4332–4343. 10 indexed citations

13.

Poffenbarger, Hanna, John E. Sawyer, Daniel W. Barker, et al.. (2018). Legacy effects of long-term nitrogen fertilizer application on the fate of nitrogen fertilizer inputs in continuous maize. Agriculture Ecosystems & Environment. 265. 544–555. 57 indexed citations

14.

Sawyer, John E. & Antonio P. Mallarino. (2018). Use of the End-of-Season Corn Stalk Nitrate Test in Iowa Corn Production. Iowa State University Digital Repository (Iowa State University). 1 indexed citations

15.

Poffenbarger, Hanna, Daniel W. Barker, Matthew J. Helmers, et al.. (2017). Maximum soil organic carbon storage in Midwest U.S. cropping systems when crops are optimally nitrogen-fertilized. PLoS ONE. 12(3). e0172293–e0172293. 132 indexed citations

16.

Sawyer, John E.. (2014). Fall Nitrogen Applications and Soil Temperature. Iowa State University Digital Repository (Iowa State University).

17.

Sawyer, John E.. (2013). Apply Nitrogen or Plant Corn?. Iowa State University Digital Repository (Iowa State University). 1 indexed citations

18.

Sawyer, John E.. (2009). Corn Nitrogen Rate Calculator Update. Iowa State University Digital Repository (Iowa State University). 1 indexed citations

19.

Sawyer, John E.. (2003). Gypsum: an old product with a new use. Iowa State University Digital Repository (Iowa State University). 1 indexed citations

20.

Mallarino, Antonio P., et al.. (2002). Nutrient Management Plan. Iowa State University Digital Repository (Iowa State University). 2 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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