P. J. O’Brien

411 total citations
17 papers, 292 citations indexed

About

P. J. O’Brien is a scholar working on Food Science, Plant Science and Agronomy and Crop Science. According to data from OpenAlex, P. J. O’Brien has authored 17 papers receiving a total of 292 indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Food Science, 16 papers in Plant Science and 3 papers in Agronomy and Crop Science. Recurrent topics in P. J. O’Brien's work include Potato Plant Research (16 papers), Plant Pathogens and Resistance (14 papers) and Plant nutrient uptake and metabolism (3 papers). P. J. O’Brien is often cited by papers focused on Potato Plant Research (16 papers), Plant Pathogens and Resistance (14 papers) and Plant nutrient uptake and metabolism (3 papers). P. J. O’Brien collaborates with scholars based in United Kingdom and South Sudan. P. J. O’Brien's co-authors include E. J. Allen, Reginald Griffith, James R. Lynn, D. C. E. Wurr, Jane R. Fellows, C. C. Hole and Susan O’Brien and has published in prestigious journals such as Field Crops Research, The Journal of Agricultural Science and Potato Research.

In The Last Decade

P. J. O’Brien

17 papers receiving 257 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
P. J. O’Brien United Kingdom	11	244	221	27	22	18	17	292
Krystyna Zarzyńska Poland	8	205 0.8×	235 1.1×	28 1.0×	8 0.4×	24 1.3×	36	307
K. B. A. Bodlaender Netherlands	11	447 1.8×	385 1.7×	49 1.8×	12 0.5×	35 1.9×	19	521
P. Vander Zaag Philippines	11	235 1.0×	273 1.2×	20 0.7×	21 1.0×	36 2.0×	37	373
P. M. Bremner United Kingdom	11	128 0.5×	256 1.2×	50 1.9×	95 4.3×	13 0.7×	11	318
R. W. Chase United States	8	198 0.8×	244 1.1×	10 0.4×	12 0.5×	16 0.9×	23	309
Jarosław Plich Poland	9	112 0.5×	304 1.4×	17 0.6×	28 1.3×	39 2.2×	30	342
S. L. Love United States	12	245 1.0×	332 1.5×	20 0.7×	9 0.4×	14 0.8×	30	394
Z. Metin Turan Türkiye	10	72 0.3×	287 1.3×	48 1.8×	105 4.8×	21 1.2×	13	341
A. R. Mosley United States	12	265 1.1×	383 1.7×	41 1.5×	10 0.5×	22 1.2×	37	443
Sahil Lal India	7	69 0.3×	141 0.6×	48 1.8×	37 1.7×	11 0.6×	37	212

Countries citing papers authored by P. J. O’Brien

Since Specialization

Citations

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

Fields of papers citing papers by P. J. O’Brien

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by P. J. O’Brien. 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. J. O’Brien. The network helps show where P. J. O’Brien may publish in the future.

Co-authorship network of co-authors of P. J. O’Brien

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

All Works

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17 of 17 papers shown

O’Brien, P. J., et al.. (1998). REVIEW A review of some studies into tuber initiation in potato (Solanum tuberosum) crops. The Journal of Agricultural Science. 130(3). 251–270. 31 indexed citations

O’Brien, P. J., et al.. (1998). Effects of shading and seed tuber spacing on initiation and number of tubers in potato crops (Solanum tuberosum). The Journal of Agricultural Science. 130(4). 431–449. 13 indexed citations

Wurr, D. C. E., et al.. (1997). The effect of some environmental factors on potato tuber numbers. Potato Research. 40(3). 297–306. 21 indexed citations

O’Brien, P. J., et al.. (1995). Appearance and growth of individual leaves in the canopies of several potato cultivars. The Journal of Agricultural Science. 125(3). 379–394. 18 indexed citations

O’Brien, P. J. & E. J. Allen. (1992). Effects of date of planting, date of harvesting and seed rate on yield of seed potato crops. The Journal of Agricultural Science. 118(3). 289–300. 8 indexed citations

O’Brien, P. J., et al.. (1992). Predicting the emergence of potato sprouts. The Journal of Agricultural Science. 118(1). 55–61. 16 indexed citations

Allen, E. J., et al.. (1992). An evaluation of small seed for ware-potato production. The Journal of Agricultural Science. 118(2). 185–193. 13 indexed citations

O’Brien, P. J. & E. J. Allen. (1992). Effects of seed crop husbandry, seed source, seed tuber weight and seed rate on the growth of ware potato crops. The Journal of Agricultural Science. 119(3). 355–366. 10 indexed citations

O’Brien, P. J., et al.. (1991). Leaf and flower initiation in potato (Solanum tuberosum) sprouts and stems in relation to number of nodes and tuber initiation. The Journal of Agricultural Science. 117(1). 61–74. 16 indexed citations

10.

O’Brien, P. J. & E. J. Allen. (1986). Effects of site of seed production on seed yields and regrowth of progeny tubers in potatoes. The Journal of Agricultural Science. 107(1). 83–101. 5 indexed citations

11.

O’Brien, P. J. & E. J. Allen. (1986). Effects of nitrogen fertilizer applied to seed crops on seed yields and regrowth of progeny tubers in potatoes. The Journal of Agricultural Science. 107(1). 103–111. 6 indexed citations

12.

O’Brien, P. J., et al.. (1986). Effects of physiological age of seed tubers on seed yield and regrowth of progeny tubers in potatoes. The Journal of Agricultural Science. 107(2). 307–327. 3 indexed citations

13.

Allen, E. J. & P. J. O’Brien. (1986). The practical significance of accumulated day-degrees as a measure of physiological age of seed potato tubers. Field Crops Research. 14. 141–151. 20 indexed citations

14.

Griffith, Reginald, E. J. Allen, Susan O’Brien, & P. J. O’Brien. (1984). Comparisons of growth and early yields of potato varieties of contrasting maturity classification at three sites. The Journal of Agricultural Science. 103(2). 443–458. 7 indexed citations

15.

O’Brien, P. J., et al.. (1983). Accumulated day-degrees as a measure of physiological age and the relationships with growth and yield in early potato varieties. The Journal of Agricultural Science. 101(3). 613–631. 82 indexed citations

16.

Allen, E. J., et al.. (1979). Effects of length of sprouting period on growth and yield of contrasting early potato varieties. The Journal of Agricultural Science. 92(1). 151–163. 22 indexed citations

17.

O’Brien, P. J., et al.. (1974). Behaviour of Heterodera avenae in two wheat cultivars.. Australasian Plant Pathology. 3(1). 22–22. 1 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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