John E. Sawyer

6.6k citations

200 papers · 4.5k indexed · 1 hit paper · h-index 37

Impact in

Soil Science top 0.2%
- Soil Carbon and Nitrogen Dynamics
Agronomy and Crop Science top 0.2%
- Crop Yield and Soil Fertility
- Agronomic Practices and Intercropping Systems

Papers in

Agronomy and Crop Science 96
- Crop Yield and Soil Fertility 84
- Agronomic Practices and Intercropping Systems 14
Soil Science 89
- Soil Carbon and Nitrogen Dynamics 79

Co-authors: Daniel W. Barker Michael J. Castellano Daniel C. Olk Antonio P. Mallarino Johan Six Kevin E. Mueller Emerson D. Nafziger John Lundvall
Journals: Agronomy Journal (42 papers)Soil Science Society of America Journal (15 papers)Journal of Soil and Water Conservation (6 papers)jpa (4 papers)Journal of Environmental Quality (3 papers)
Partner nations: United States Australia Ecuador

In The Last Decade

John E. Sawyer

189 papers receiving 4.3k citations

Hit Papers

align trajectories log scale

Integrating plant litter quality, soil organic matter stabilization, and the carbon saturation concept 2015 · 526 citations

Peers

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

The 25 scholars most cited alongside John E. Sawyer, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with John E. Sawyer Line = papers co-authored together John E. Sawyer links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

#	Work
1	The optimum nitrogen fertilizer rate for maize in the US Midwest is increasing Nature Communications ·Mitchell Baum, John E. Sawyer, Emerson D. Nafziger, Michael J. Castellano, Marshall D. McDaniel, Mark A. Licht, Dermot J. Hayes, Matthew J. Helmers, Sotirios V. Archontoulis	2025	11
2	The nitrogen fertilizer conundrum: why is yield a poor determinant of crops’ nitrogen fertilizer requirements? Agronomy for Sustainable Development ·Peter J. Thorburn, J. S. Biggs, Laila A. Puntel, John E. Sawyer, Yvette Everingham, Sotirios V. Archontoulis	2024	13
3	Combining corn N recommendation tools for an improved economical optimal nitrogen rate estimation Soil Science Society of America Journal ·Curtis J. Ransom, Newell R. Kitchen, James J. Camberato, Paul R. Carter, Richard B. Ferguson, Fabián G. Fernández, David W. Franzen, Carrie A. M. Laboski, D. Brenton Myers, Emerson D. Nafziger, John E. Sawyer, John F. Shanahan	2023	7
4	Evaluating Critical Nitrogen Dilution Curves for Assessing Maize Nitrogen Status across the US Midwest Agronomy ·Hui Shao, Yuxin Miao, Fabián G. Fernández, Newell R. Kitchen, Curtis J. Ransom, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Carrie A. M. Laboski, Emerson D. Nafziger, John E. Sawyer, John F. Shanahan	2023	6
5	Corn Nitrogen Nutrition Index Prediction Improved by Integrating Genetic, Environmental, and Management Factors with Active Canopy Sensing Using Machine Learning Remote Sensing ·Dan Li, Yuxin Miao, Curtis J. Ransom, G. Mac Bean, Newell R. Kitchen, Fabián G. Fernández, John E. Sawyer, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Carrie A. M. Laboski, Emerson D. Nafziger, John F. Shanahan	2022	35
6	Soil hydrologic grouping guide which soil and weather properties best estimate corn nitrogen need Agronomy Journal ·G. Mac Bean, Curtis J. Ransom, Newell R. Kitchen, Peter C. Scharf, Kristen S. Veum, James J. Camberato, Richard B. Ferguson, Fabián G. Fernández, David W. Franzen, Carrie A. M. Laboski, Emerson D. Nafziger, John E. Sawyer, Robert Nielsen	2021	6
7	Data from a public–industry partnership for enhancing corn nitrogen research Agronomy Journal ·Curtis J. Ransom, Jason D. Clark, G. Mac Bean, Hurtado Romero, З. Залевски, Newell R. Kitchen, James J. Camberato, Paul R. Carter, Richard B. Ferguson, Fabián G. Fernández, David W. Franzen, Carrie A. M. Laboski, D. Brenton Myers, Emerson D. Nafziger, John E. Sawyer, John F. Shanahan	2021	7
8	Improving publicly available corn nitrogen rate recommendation tools with soil and weather measurements Agronomy Journal ·Curtis J. Ransom, Newell R. Kitchen, John E. Sawyer, James J. Camberato, Paul R. Carter, Richard B. Ferguson, Fabián G. Fernández, David W. Franzen, Carrie A. M. Laboski, D. Brenton Myers, Emerson D. Nafziger, John F. Shanahan	2021	14
9	Adjusting corn nitrogen management by including a mineralizable‐nitrogen test with the preplant and presidedress nitrate tests Agronomy Journal ·Jason D. Clark, Fabián G. Fernández, Kristen S. Veum, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Newell R. Kitchen, Carrie A. M. Laboski, Emerson D. Nafziger, Carl J. Rosen, John E. Sawyer, John F. Shanahan	2020	5
10	Weather and soil in the US Midwest influence the effectiveness of single‐ and split‐nitrogen applications in corn production Agronomy Journal ·Jason D. Clark, Fabián G. Fernández, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Newell R. Kitchen, Carrie A. M. Laboski, Emerson D. Nafziger, John E. Sawyer, John F. Shanahan	2020	19
11	Soil sample timing, nitrogen fertilization, and incubation length influence anaerobic potentially mineralizable nitrogen Soil Science Society of America Journal ·Jason D. Clark, Kristen S. Veum, Fabián G. Fernández, Newell R. Kitchen, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Carrie A. M. Laboski, Emerson D. Nafziger, Carl J. Rosen, John E. Sawyer, John F. Shanahan	2020	10
12	Soil‐nitrogen, potentially mineralizable‐nitrogen, and field condition information marginally improves corn nitrogen management Agronomy Journal ·Jason D. Clark, Fabián G. Fernández, Kristen S. Veum, James J. Camberato, Paul R. Carter, Richard B. Ferguson, David W. Franzen, Daniel E. Kaiser, Newell R. Kitchen, Carrie A. M. Laboski, Emerson D. Nafziger, Carl J. Rosen, John E. Sawyer, John F. Shanahan	2020	10
13	Legacy effects of long-term nitrogen fertilizer application on the fate of nitrogen fertilizer inputs in continuous maize Agriculture Ecosystems & Environment ·Hanna Poffenbarger, John E. Sawyer, Daniel W. Barker, Daniel C. Olk, Johan Six, Michael J. Castellano	2018	57
14	Use of the End-of-Season Corn Stalk Nitrate Test in Iowa Corn Production Iowa State University Digital Repository (Iowa State University) ·John E. Sawyer, Antonio P. Mallarino	2018	1
15	Maximum soil organic carbon storage in Midwest U.S. cropping systems when crops are optimally nitrogen-fertilized PLoS ONE ·Hanna Poffenbarger, Daniel W. Barker, Matthew J. Helmers, Fernando E. Miguez, Daniel C. Olk, John E. Sawyer, Johan Six, Michael J. Castellano	2017	132
16	Fall Nitrogen Applications and Soil Temperature Iowa State University Digital Repository (Iowa State University) ·John E. Sawyer	2014	0
17	Apply Nitrogen or Plant Corn? Iowa State University Digital Repository (Iowa State University) ·John E. Sawyer	2013	1
18	Corn Nitrogen Rate Calculator Update Iowa State University Digital Repository (Iowa State University) ·John E. Sawyer	2009	1
19	Gypsum: an old product with a new use Iowa State University Digital Repository (Iowa State University) ·John E. Sawyer	2003	1
20	Nutrient Management Plan Iowa State University Digital Repository (Iowa State University) ·Antonio P. Mallarino, John E. Sawyer, DP Dupont, K. Birkenmajer	2002	2

About John E. Sawyer

John E. Sawyer is a scholar working on Agronomy and Crop Science, Soil Science, Environmental Chemistry, Plant Science and Environmental Engineering, having authored 200 papers that have together received 4.5k indexed citations. Recurring topics across this work include Crop Yield and Soil Fertility (84 papers), Soil Carbon and Nitrogen Dynamics (79 papers), Soil and Water Nutrient Dynamics (54 papers), Plant nutrient uptake and metabolism (32 papers), Soil Geostatistics and Mapping (16 papers), Agronomic Practices and Intercropping Systems (14 papers), Nitrogen and Sulfur Effects on Brassica (9 papers) and Remote Sensing in Agriculture (8 papers). The work is most often cited by research in Soil Science (2.5k citations), Agronomy and Crop Science (1.5k citations), Environmental Chemistry (1.3k citations), Plant Science (1.6k citations) and Ecology (854 citations). John E. Sawyer has collaborated with scholars based in United States, Australia and Ecuador. Frequent 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. Their work appears in journals such as Agronomy Journal, Soil Science Society of America Journal, Journal of Soil and Water Conservation, jpa and Journal of Environmental Quality.

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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