P. D. Johnstone

1.6k total citations
103 papers, 1.3k citations indexed

About

P. D. Johnstone is a scholar working on Agronomy and Crop Science, Genetics and Pathology and Forensic Medicine. According to data from OpenAlex, P. D. Johnstone has authored 103 papers receiving a total of 1.3k indexed citations (citations by other indexed papers that have themselves been cited), including 39 papers in Agronomy and Crop Science, 26 papers in Genetics and 17 papers in Pathology and Forensic Medicine. Recurrent topics in P. D. Johnstone's work include Genetic and phenotypic traits in livestock (25 papers), Reproductive Physiology in Livestock (23 papers) and Ruminant Nutrition and Digestive Physiology (18 papers). P. D. Johnstone is often cited by papers focused on Genetic and phenotypic traits in livestock (25 papers), Reproductive Physiology in Livestock (23 papers) and Ruminant Nutrition and Digestive Physiology (18 papers). P. D. Johnstone collaborates with scholars based in New Zealand, Cambodia and United States. P. D. Johnstone's co-authors include M.A. Gemmell, B.I.P. Barratt, I.R. Hall, A. G. Sinclair, G. H. Davis, Jennifer L. Juengel, R. M. Dolby, Malcolm H. Douglas, L. C. Smith and R. W. Kelly and has published in prestigious journals such as Bioinformatics, New Phytologist and Soil Biology and Biochemistry.

In The Last Decade

P. D. Johnstone

101 papers receiving 1.2k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
P. D. Johnstone New Zealand 21 306 268 255 199 143 103 1.3k
Alison Kelly Australia 24 283 0.9× 452 1.7× 978 3.8× 283 1.4× 43 0.3× 79 1.8k
Christina Marley United Kingdom 16 333 1.1× 69 0.3× 249 1.0× 199 1.0× 214 1.5× 45 880
Maurice Mahieu Guadeloupe 18 138 0.5× 136 0.5× 86 0.3× 242 1.2× 424 3.0× 75 891
A. Arieli Israel 30 1.6k 5.1× 676 2.5× 261 1.0× 227 1.1× 349 2.4× 85 2.5k
D.K. Revell Australia 21 709 2.3× 281 1.0× 126 0.5× 219 1.1× 296 2.1× 59 1.2k
E. Pfeffer Germany 24 576 1.9× 253 0.9× 214 0.8× 135 0.7× 124 0.9× 120 2.1k
E. V. Nordheim United States 17 420 1.4× 291 1.1× 196 0.8× 90 0.5× 146 1.0× 33 1.0k
B.E. Brent United States 17 852 2.8× 162 0.6× 168 0.7× 113 0.6× 108 0.8× 38 1.2k
J. V. Nolan Australia 33 2.5k 8.1× 901 3.4× 329 1.3× 504 2.5× 464 3.2× 168 3.6k
T. Fujihara Japan 19 956 3.1× 293 1.1× 269 1.1× 70 0.4× 68 0.5× 95 1.6k

Countries citing papers authored by P. D. Johnstone

Since Specialization
Citations

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

Fields of papers citing papers by P. D. Johnstone

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by P. D. Johnstone. 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 P. D. Johnstone. The network helps show where P. D. Johnstone may publish in the future.

Co-authorship network of co-authors of P. D. Johnstone

This figure shows the co-authorship network connecting the top 25 collaborators of P. D. Johnstone. A scholar is included among the top collaborators of P. D. Johnstone 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 P. D. Johnstone. P. D. Johnstone 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.
Teixeira, Edmar, P. D. Johnstone, E. Chakwizira, et al.. (2015). Quantifying key sources of variability in cover crop reduction of N leaching. 1 indexed citations
2.
Fisher, M. W. & P. D. Johnstone. (2002). A putative effect of ambient temperature during the rut on time of calving in young red deer hinds. New Zealand Journal of Agricultural Research. 45(4). 305–308. 3 indexed citations
3.
Johnstone, P. D.. (1998). Should sequential designs be used for comparative experiments on animals?. New Zealand Journal of Agricultural Research. 41(4). 561–566.
4.
Sinclair, A. G., et al.. (1998). Comparison of six phosphate rocks and single superphosphate as phosphate fertilisers for clover‐based pasture. New Zealand Journal of Agricultural Research. 41(3). 415–420. 6 indexed citations
5.
Sinclair, A. G., P. D. Johnstone, L. C. Smith, et al.. (1997). Relationship between pasture dry matter yield and soil Olsen P from a series of long‐term field trials. New Zealand Journal of Agricultural Research. 40(4). 559–567. 23 indexed citations
6.
Morton, James D., A. G. Sinclair, P. D. Johnstone, et al.. (1995). Effects of frequency of application of triple superphosphate and Sechura phosphate rock on pasture DM production, herbage P concentration, and Olsen P soil tests. New Zealand Journal of Agricultural Research. 38(4). 543–552. 5 indexed citations
7.
Morton, James D., M.B. O’Connor, L. Nguyen, et al.. (1994). Effects of triple superphosphate and Sechura phosphate rock on clover and nitrogen content of pasture. New Zealand Journal of Agricultural Research. 37(4). 569–575. 3 indexed citations
8.
Scott, Ian & P. D. Johnstone. (1994). Variations between years in the ram effect when Coopworth or Poll Dorset rams are introduced to seasonally anovular Coopworth ewes. New Zealand Journal of Agricultural Research. 37(2). 187–193. 10 indexed citations
9.
Roberts, A. H. C., A. G. Sinclair, P. D. Johnstone, et al.. (1994). Changes in soil Olsen P over six years with annual applications of triple superphosphate or reactive phosphate rock (Sechura). New Zealand Journal of Agricultural Research. 37(2). 229–237. 13 indexed citations
10.
Johnstone, P. D., et al.. (1993). Design and analysis of multi‐site agronomic evaluation trials. New Zealand Journal of Agricultural Research. 36(3). 323–326. 3 indexed citations
11.
Sinclair, A. G., P. D. Johnstone, L. C. Smith, et al.. (1993). Effect of reactive phosphate rock on the pH of soil under pasture. New Zealand Journal of Agricultural Research. 36(3). 381–384. 12 indexed citations
12.
Fennessy, P. F., W. E. Bain, G. J. Greer, & P. D. Johnstone. (1992). Carcass characteristics of progeny from ram lambs selected for high or low ultrasonic backfat thickness. New Zealand Journal of Agricultural Research. 35(2). 177–183. 11 indexed citations
13.
Barratt, B.I.P., et al.. (1992). Effect of native weevils (Coleoptera: Curculionidae) on white clover establishment and yield in tussock grassland. New Zealand Journal of Agricultural Research. 35(1). 63–73. 8 indexed citations
14.
Isaacs, Kim L., et al.. (1991). Influence of maternal liveweight on reproductive performance and wool production of heterozygous Booroola Merino × Coopworth (Fec B Fec + ) and Merino × Coopworth ewes. New Zealand Journal of Agricultural Research. 34(1). 55–67. 5 indexed citations
15.
Kelly, R. W. & P. D. Johnstone. (1983). Influence of site of ovulation on the reproductive performance of ewes with 1 or 2 ovulations. New Zealand Journal of Agricultural Research. 26(4). 433–435. 6 indexed citations
16.
Kelly, R. W. & P. D. Johnstone. (1982). Reproductive performance of commercial sheep flocks in South Island districts. New Zealand Journal of Agricultural Research. 25(4). 519–523. 21 indexed citations
17.
Lowther, W. L. & P. D. Johnstone. (1979). Coating materials for commercial inoculated and coated clover seed. New Zealand Journal of Agricultural Research. 22(3). 475–478. 11 indexed citations
18.
Sinclair, A. G., et al.. (1978). Evaluation of a non‐destructive acetylene reduction assay of nitrogen fixation for pasture legumes grown in pots. New Zealand Journal of Crop and Horticultural Science. 6(1). 65–68. 4 indexed citations
19.
Johnstone, P. D., et al.. (1977). Effects of animals on pasture production. New Zealand Journal of Agricultural Research. 20(1). 23–30. 5 indexed citations
20.
Radcliffe, J. E., et al.. (1977). Survival and growth of introduced grasses in Canterbury hill pastures. New Zealand Journal of Crop and Horticultural Science. 5(2). 129–135. 4 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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