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.
Equations for Following Nutrient Transformations in Soil, Utilizing Tracer Data
1954570 citationsDon Kirkham, W. V. BartholomewSoil Science Society of America Journalprofile →
Equations for Following Nutrient Transformations in Soil, Utilizing Tracer Data: II.
1955484 citationsDon Kirkham, W. V. BartholomewSoil Science Society of America Journalprofile →
Peers — A (Enhanced Table)
Peers by citation overlap · career bar shows stage (early→late)
cites ·
hero ref
This map shows the geographic impact of Don Kirkham'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 Don Kirkham with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Don Kirkham more than expected).
This network shows the impact of papers produced by Don Kirkham. 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 Don Kirkham. The network helps show where Don Kirkham may publish in the future.
Co-authorship network of co-authors of Don Kirkham
This figure shows the co-authorship network connecting the top 25 collaborators of Don Kirkham.
A scholar is included among the top collaborators of Don Kirkham 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 Don Kirkham. Don Kirkham is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Kirkham, Don, et al.. (1968). Advance of irrigation water on the soil surface in relation to soil infiltration rate: A mathematical and laboratory model study. Iowa State University Digital Repository (Iowa State University). 36(565). 1.3 indexed citations
13.
Corey, J.C., Don Kirkham, & D. R. Nielsen. (1967). The Movement of Chloride and Nitrate through Certain Iowa Soils. UNI ScholarWorks (University of Northern Iowa). 74(1). 130–141.3 indexed citations
Kirkham, Don, et al.. (1964). Solving tile drainage problems by using model data. Iowa State University Digital Repository (Iowa State University). 35(523). 1.
Schilfgaarde, Jan van, Don Kirkham, & Richard K. Frevert. (1956). Physical and mathematical theories of tile and ditch drainage and their usefulness in design. Iowa State University Digital Repository (Iowa State University). 32(436). 1.18 indexed citations
19.
Kirkham, Don & W. V. Bartholomew. (1954). Equations for Following Nutrient Transformations in Soil, Utilizing Tracer Data. Soil Science Society of America Journal. 18(1). 33–34.570 indexed citations breakdown →
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.