John L. Kovar

2.2k total citations
81 papers, 1.6k citations indexed

About

John L. Kovar is a scholar working on Soil Science, Environmental Chemistry and Water Science and Technology. According to data from OpenAlex, John L. Kovar has authored 81 papers receiving a total of 1.6k indexed citations (citations by other indexed papers that have themselves been cited), including 51 papers in Soil Science, 49 papers in Environmental Chemistry and 18 papers in Water Science and Technology. Recurrent topics in John L. Kovar's work include Soil and Water Nutrient Dynamics (44 papers), Soil Carbon and Nitrogen Dynamics (27 papers) and Soil erosion and sediment transport (22 papers). John L. Kovar is often cited by papers focused on Soil and Water Nutrient Dynamics (44 papers), Soil Carbon and Nitrogen Dynamics (27 papers) and Soil erosion and sediment transport (22 papers). John L. Kovar collaborates with scholars based in United States, Canada and Indonesia. John L. Kovar's co-authors include Douglas L. Karlen, Cynthia A. Cambardella, Thomas S. Colvin, Michael L. Thompson, James R. Russell, S. A. Barber, Michael S. Cox, J. M. Kelly, Thomas B. Moorman and Paul F. Bell and has published in prestigious journals such as PLoS ONE, The Science of The Total Environment and Soil Science Society of America Journal.

In The Last Decade

John L. Kovar

79 papers receiving 1.5k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
John L. Kovar United States 23 877 684 443 287 275 81 1.6k
Paul B. DeLaune United States 22 905 1.0× 584 0.9× 350 0.8× 284 1.0× 283 1.0× 79 1.7k
T. W. Welacky Canada 22 938 1.1× 795 1.2× 546 1.2× 198 0.7× 244 0.9× 53 1.8k
Helena Aronsson Sweden 23 1.0k 1.2× 963 1.4× 435 1.0× 343 1.2× 322 1.2× 56 1.7k
Dana L. Dinnes United States 10 720 0.8× 690 1.0× 406 0.9× 169 0.6× 282 1.0× 22 1.4k
William E. Jokela United States 27 1.2k 1.4× 960 1.4× 418 0.9× 232 0.8× 554 2.0× 59 2.0k
D. B. Beegle United States 22 816 0.9× 979 1.4× 355 0.8× 259 0.9× 392 1.4× 45 1.7k
H. J. Di New Zealand 22 837 1.0× 712 1.0× 268 0.6× 290 1.0× 207 0.8× 31 1.4k
Douglas B. Beegle United States 21 612 0.7× 677 1.0× 212 0.5× 165 0.6× 216 0.8× 37 1.2k
Qiuliang Lei China 23 780 0.9× 547 0.8× 517 1.2× 245 0.9× 288 1.0× 77 1.8k
Marco Roelcke China 24 853 1.0× 521 0.8× 500 1.1× 169 0.6× 228 0.8× 38 1.5k

Countries citing papers authored by John L. Kovar

Since Specialization
Citations

This map shows the geographic impact of John L. Kovar'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 L. Kovar with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John L. Kovar more than expected).

Fields of papers citing papers by John L. Kovar

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John L. Kovar. 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 L. Kovar. The network helps show where John L. Kovar may publish in the future.

Co-authorship network of co-authors of John L. Kovar

This figure shows the co-authorship network connecting the top 25 collaborators of John L. Kovar. A scholar is included among the top collaborators of John L. Kovar 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 L. Kovar. John L. Kovar is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Malone, Robert W., John L. Kovar, Bryan D. Emmett, et al.. (2025). Rye performance in central Iowa under different seeding and nitrogen fertilizer rates. Agronomy Journal. 117(4).
2.
Chatterjee, Amitava, Kelly R. Thorp, Peter O’Brien, et al.. (2025). Long-term DSSAT simulation of nitrogen loss to artificial subsurface drainage flow for a corn-soybean rotation with winter rye in Iowa. Agricultural Water Management. 312. 109464–109464. 1 indexed citations
3.
Kovar, John L., et al.. (2025). Long-term field study on corn response to sulfur fertilization in Iowa, USA. Field Crops Research. 330. 109990–109990.
4.
O’Brien, Peter, et al.. (2024). Thermal time and precipitation dictate cereal rye shoot biomass production. Field Crops Research. 315. 109473–109473. 4 indexed citations
5.
Ruis, Sabrina J., John L. Kovar, Kenneth M. Wacha, et al.. (2024). Organic cropping systems enhance soil health indicators in a Mollisol of the US Corn Belt. Soil Science Society of America Journal. 89(1). 2 indexed citations
6.
Rogovska, Natalia, John L. Kovar, Robert W. Malone, et al.. (2024). Impact of tillage, cover crop, and in situ bioreactors on nutrient loss from an artificially drained Midwestern Mollisol. Journal of Environmental Quality. 54(3). 590–604. 1 indexed citations
7.
O’Brien, Peter, Márcio Renato Nunes, Sabrina J. Ruis, et al.. (2024). Contrasting soil management systems had limited effects on soil health and crop yields in a North Central US Mollisol. Soil Science Society of America Journal. 88(5). 1723–1735. 5 indexed citations
8.
Kovar, John L., A. N. Papanicolaou, Amitava Chatterjee, et al.. (2024). The LTAR Cropland Common Experiment at Upper Mississippi River Basin–Ames. Journal of Environmental Quality. 53(6). 978–988. 2 indexed citations
9.
Margenot, Andrew J., et al.. (2023). Streambank erosion and phosphorus loading to surface waters: Knowns, unknowns, and implications for nutrient loss reduction research and policy. Journal of Environmental Quality. 52(6). 1063–1079. 12 indexed citations
10.
Malone, Robert W., Huaiqing Wu, Zhiming Qi, et al.. (2023). Harvested winter rye energy cover crop: multiple benefits for North Central US. Environmental Research Letters. 18(7). 74009–74009. 9 indexed citations
11.
Moore, Peter, et al.. (2023). Sediment and phosphorus contributions from eroding banks in a large intensively managed watershed in western Iowa, United States. JAWRA Journal of the American Water Resources Association. 60(1). 148–162. 2 indexed citations
12.
O’Brien, Peter, Bryan D. Emmett, Robert W. Malone, et al.. (2022). Nitrate losses and nitrous oxide emissions under contrasting tillage and cover crop management. Journal of Environmental Quality. 51(4). 683–695. 22 indexed citations
13.
Nunes, Márcio Renato, Mriganka De, Marshall D. McDaniel, et al.. (2021). Science‐based maize stover removal can be sustainable. Agronomy Journal. 113(4). 3178–3192. 9 indexed citations
14.
Crusciol, Carlos Alexandre Costa, et al.. (2021). Potassium Bioavailability in a Tropical Kaolinitic Soil. Agronomy. 11(10). 2016–2016. 15 indexed citations
15.
Kovar, John L., et al.. (2016). Phosphorus source—sink relationships of stream sediments in the Rathbun Lake watershed in southern Iowa, USA. Environmental Monitoring and Assessment. 188(8). 453–453. 24 indexed citations
16.
Kovar, John L., et al.. (2011). Grazing management effects on stream bank erosion and phosphorus delivery to a pasture stream. Canadian Journal of Soil Science. 91(3). 385–396. 12 indexed citations
17.
Bortolon, Leandro, John L. Kovar, & Clésio Gianello. (2009). Phosphorus depletion from rhizosphere solution by maize grown in compost-amended soil.. eScholarship (California Digital Library). 1 indexed citations
18.
Baum, Kristen A., Gary M. Pierzynski, Peter J. A. Kleinman, et al.. (2006). Evaluating the Influence of Storage Time, Sample‐handling Method, and Filter Paper on the Measurement of Water‐Extractable Phosphorus in Animal Manures. Communications in Soil Science and Plant Analysis. 37(3-4). 451–463. 3 indexed citations
19.
Wortmann, Charles S., Matthew J. Helmers, Antonio P. Mallarino, et al.. (2005). Agricultural Phosphorus Management and Water Quality Protection in the Midwest. Iowa State University Digital Repository (Iowa State University). 4 indexed citations
20.
Cox, Michael S., Paul F. Bell, & John L. Kovar. (1996). Differential tolerance of canola to arsenic when grown hydroponically or in soil. Journal of Plant Nutrition. 19(12). 1599–1610. 54 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Paul B. DeLaune Breakdown of academic impact, for papers by T. W. Welacky Breakdown of academic impact, for papers by Helena Aronsson Breakdown of academic impact, for papers by Dana L. Dinnes Breakdown of academic impact, for papers by William E. Jokela Breakdown of academic impact, for papers by D. B. Beegle Breakdown of academic impact, for papers by H. J. Di Breakdown of academic impact, for papers by Douglas B. Beegle Breakdown of academic impact, for papers by Qiuliang Lei Breakdown of academic impact, for papers by Marco Roelcke
Rankless by CCL
2026