World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Plant Science and Agronomy 49 2293 2116 185 161 167 8074

R. J. Summerfield publications per year

The chart shows the history of publications by R. J. Summerfield between 1972 and 2022, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. R. J. Summerfield published across 51 years, from 1972 to 2022, averaging 3.3 papers a year. Output peaked at 12 publications in 1994. 1 of the 170 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1972 to 2022. Vertical axis: number of publications, 0 to 12. Peak 12 publications in 1994. 1972: 3 publications 1973: 4 publications 1974: 6 publications 1975: 3 publications 1976: 9 publications 1977: 10 publications 1978: 6 publications 1979: 0 publications 1980: 6 publications 1981: 6 publications 1982: 4 publications 1983: 2 publications 1984: 5 publications 1985: 4 publications 1986: 3 publications 1987: 4 publications 1988: 10 publications 1989: 3 publications 1990: 2 publications 1991: 1 publication 1992: 4 publications 1993: 5 publications 1994: 12 publications 1995: 6 publications 1996: 8 publications 1997: 7 publications 1998: 8 publications 1999: 11 publications 2000: 10 publications 2001: 4 publications 2002: 1 publication 2003: 0 publications 2004: 0 publications 2005: 0 publications 2006: 0 publications 2007: 0 publications 2008: 0 publications 2009: 0 publications 2010: 0 publications 2011: 0 publications 2012: 0 publications 2013: 0 publications 2014: 0 publications 2015: 0 publications 2016: 0 publications 2017: 0 publications 2018: 1 publication 2019: 1 publication 2020: 0 publications 2021: 0 publications 2022: 1 publication
1972 2022

170 publications in total across all disciplines

View publications per year as a table
R. J. Summerfield: publications per year, 1972 to 2022
Year Publications
1972 3
1973 4
1974 6
1975 3
1976 9
1977 10
1978 6
1979 0
1980 6
1981 6
1982 4
1983 2
1984 5
1985 4
1986 3
1987 4
1988 10
1989 3
1990 2
1991 1
1992 4
1993 5
1994 12
1995 6
1996 8
1997 7
1998 8
1999 11
2000 10
2001 4
2002 1
2003 0
2004 0
2005 0
2006 0
2007 0
2008 0
2009 0
2010 0
2011 0
2012 0
2013 0
2014 0
2015 0
2016 0
2017 0
2018 1
2019 1
2020 0
2021 0
2022 1
Total 170
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R. J. Summerfield publications per year - data summary

  • R. J. Summerfield, a Plant Science and Agronomy scholar from University of Reading, has 170 publications recorded across 51 years, from 1972 to 2022.
  • The oldest publication on record dates to 1972 and the most recent to 2022.
  • The most productive year is 1994, with 12 publications.
  • The least productive years with any output are 1991, 2002, 2018, 2019 and others, with 1 publication each.
  • 18 of the 51 years in the span carry no publications at all (1979, 2003, 2004, 2005 and others).
  • The rate of publication averages 3.3 papers per year over the whole span, or 5.2 per year counting only the 33 years with at least one publication.
  • The last 5 years on the chart (2018-2022) hold 3 publications, 2% of the career total.
  • Split into equal eras - 1972-1988: 85 publications (5.0 per year); 1989-2005: 82 publications (4.8 per year); 2006-2022: 3 publications (0.2 per year).
  • Comparing the opening and closing eras, the overall trend of publication is declining.

R. J. Summerfield publication distribution in Plant Science and Agronomy in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Plant Science and Agronomy in 2026. The highlighted bar marks where R. J. Summerfield sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 88 bars. Horizontal axis: publications, 36–40 to 467+. Vertical axis: number of scientists, 0 to 255. Most scientists, 255, have 111–115 publications. The last bar groups every scientist with 467 publications or more. The highlighted bar, 166–170 publications, is where this scientist sits. 36–40 publications: 2 scientists 41–45 publications: 7 scientists 46–50 publications: 40 scientists 51–55 publications: 58 scientists 56–60 publications: 60 scientists 61–65 publications: 107 scientists 66–70 publications: 130 scientists 71–75 publications: 153 scientists 76–80 publications: 191 scientists 81–85 publications: 199 scientists 86–90 publications: 206 scientists 91–95 publications: 218 scientists 96–100 publications: 226 scientists 101–105 publications: 227 scientists 106–110 publications: 247 scientists 111–115 publications: 255 scientists 116–120 publications: 253 scientists 121–125 publications: 233 scientists 126–130 publications: 219 scientists 131–135 publications: 201 scientists 136–140 publications: 194 scientists 141–145 publications: 176 scientists 146–150 publications: 157 scientists 151–155 publications: 147 scientists 156–160 publications: 151 scientists 161–165 publications: 159 scientists 166–170 publications: 137 scientists 171–175 publications: 128 scientists 176–180 publications: 126 scientists 181–185 publications: 98 scientists 186–190 publications: 114 scientists 191–195 publications: 100 scientists 196–200 publications: 90 scientists 201–205 publications: 71 scientists 206–210 publications: 98 scientists 211–215 publications: 70 scientists 216–220 publications: 86 scientists 221–225 publications: 61 scientists 226–230 publications: 58 scientists 231–235 publications: 53 scientists 236–240 publications: 64 scientists 241–245 publications: 39 scientists 246–250 publications: 46 scientists 251–255 publications: 51 scientists 256–260 publications: 36 scientists 261–265 publications: 44 scientists 266–270 publications: 35 scientists 271–275 publications: 30 scientists 276–280 publications: 33 scientists 281–285 publications: 35 scientists 286–290 publications: 36 scientists 291–295 publications: 26 scientists 296–300 publications: 26 scientists 301–305 publications: 31 scientists 306–310 publications: 30 scientists 311–315 publications: 21 scientists 316–320 publications: 29 scientists 321–325 publications: 14 scientists 326–330 publications: 15 scientists 331–335 publications: 15 scientists 336–340 publications: 17 scientists 341–345 publications: 15 scientists 346–350 publications: 12 scientists 351–355 publications: 17 scientists 356–360 publications: 18 scientists 361–365 publications: 12 scientists 366–370 publications: 11 scientists 371–375 publications: 6 scientists 376–380 publications: 6 scientists 381–385 publications: 11 scientists 386–390 publications: 9 scientists 391–395 publications: 10 scientists 396–400 publications: 8 scientists 401–405 publications: 4 scientists 406–410 publications: 9 scientists 411–415 publications: 11 scientists 416–420 publications: 4 scientists 421–425 publications: 7 scientists 426–430 publications: 4 scientists 431–435 publications: 3 scientists 436–440 publications: 5 scientists 441–445 publications: 8 scientists 446–450 publications: 6 scientists 451–455 publications: 7 scientists 456–460 publications: 5 scientists 461–465 publications: 6 scientists 466 publications: 2 scientists 467+ publications: 99 scientists
36–40 publications 467+

This scientist: 167 publications — 66th percentile

66% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 467 publications or more.

View publications distribution as a table
Number of Plant Science and Agronomy scientists by publication count, Research.com 2026 ranking edition. Based on 6,494 ranked scientists.
Publications Scientists This scientist
36–40 2
41–45 7
46–50 40
51–55 58
56–60 60
61–65 107
66–70 130
71–75 153
76–80 191
81–85 199
86–90 206
91–95 218
96–100 226
101–105 227
106–110 247
111–115 255
116–120 253
121–125 233
126–130 219
131–135 201
136–140 194
141–145 176
146–150 157
151–155 147
156–160 151
161–165 159
166–170 137 167
171–175 128
176–180 126
181–185 98
186–190 114
191–195 100
196–200 90
201–205 71
206–210 98
211–215 70
216–220 86
221–225 61
226–230 58
231–235 53
236–240 64
241–245 39
246–250 46
251–255 51
256–260 36
261–265 44
266–270 35
271–275 30
276–280 33
281–285 35
286–290 36
291–295 26
296–300 26
301–305 31
306–310 30
311–315 21
316–320 29
321–325 14
326–330 15
331–335 15
336–340 17
341–345 15
346–350 12
351–355 17
356–360 18
361–365 12
366–370 11
371–375 6
376–380 6
381–385 11
386–390 9
391–395 10
396–400 8
401–405 4
406–410 9
411–415 11
416–420 4
421–425 7
426–430 4
431–435 3
436–440 5
441–445 8
446–450 6
451–455 7
456–460 5
461–465 6
466 2
467+ 99
Download as CSV

R. J. Summerfield publication distribution in Plant Science and Agronomy in 2026 - data summary

  • The chart plots the publication count of all 6,494 Plant Science and Agronomy scientists ranked by Research.com in 2026, grouped into 88 ranges running from 36–40 to 467+ publications.
  • R. J. Summerfield, a Plant Science and Agronomy scholar from University of Reading, records 167 publications - the 66th percentile of the discipline.
  • 66% of ranked Plant Science and Agronomy scientists score the same or lower than R. J. Summerfield, and about 34% score higher.
  • The median of the discipline falls in the 136–140 publications range, and R. J. Summerfield ranks above the median.
  • The most crowded range is 111–115 publications, holding 255 scientists (4% of the field).
  • 55% of the field sits in the lowest quarter of the value range (up to 141–145 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 467 publications or more, 99 scientists in all (2% of the field).

R. J. Summerfield D-index placement in Plant Science and Agronomy in 2026

The chart shows the D-index (discipline H-index) distribution of Plant Science and Agronomy scientists ranked by Research.com in 2026. The highlighted bar marks where R. J. Summerfield sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 80 bars. Horizontal axis: D-Index, 30 to 109+. Vertical axis: number of scientists, 0 to 288. Most scientists, 288, have 34 D-Index. The last bar groups every scientist with 109 D-Index or more. The highlighted bar, 49 D-Index, is where this scientist sits. 30 D-Index: 200 scientists 31 D-Index: 236 scientists 32 D-Index: 253 scientists 33 D-Index: 283 scientists 34 D-Index: 288 scientists 35 D-Index: 240 scientists 36 D-Index: 246 scientists 37 D-Index: 243 scientists 38 D-Index: 247 scientists 39 D-Index: 229 scientists 40 D-Index: 232 scientists 41 D-Index: 230 scientists 42 D-Index: 228 scientists 43 D-Index: 219 scientists 44 D-Index: 193 scientists 45 D-Index: 164 scientists 46 D-Index: 158 scientists 47 D-Index: 143 scientists 48 D-Index: 131 scientists 49 D-Index: 127 scientists 50 D-Index: 122 scientists 51 D-Index: 122 scientists 52 D-Index: 110 scientists 53 D-Index: 102 scientists 54 D-Index: 98 scientists 55 D-Index: 79 scientists 56 D-Index: 85 scientists 57 D-Index: 88 scientists 58 D-Index: 91 scientists 59 D-Index: 62 scientists 60 D-Index: 61 scientists 61 D-Index: 59 scientists 62 D-Index: 54 scientists 63 D-Index: 61 scientists 64 D-Index: 59 scientists 65 D-Index: 58 scientists 66 D-Index: 41 scientists 67 D-Index: 49 scientists 68 D-Index: 39 scientists 69 D-Index: 32 scientists 70 D-Index: 40 scientists 71 D-Index: 47 scientists 72 D-Index: 38 scientists 73 D-Index: 28 scientists 74 D-Index: 29 scientists 75 D-Index: 28 scientists 76 D-Index: 22 scientists 77 D-Index: 21 scientists 78 D-Index: 25 scientists 79 D-Index: 26 scientists 80 D-Index: 19 scientists 81 D-Index: 16 scientists 82 D-Index: 12 scientists 83 D-Index: 16 scientists 84 D-Index: 14 scientists 85 D-Index: 11 scientists 86 D-Index: 17 scientists 87 D-Index: 13 scientists 88 D-Index: 10 scientists 89 D-Index: 12 scientists 90 D-Index: 18 scientists 91 D-Index: 16 scientists 92 D-Index: 16 scientists 93 D-Index: 17 scientists 94 D-Index: 12 scientists 95 D-Index: 8 scientists 96 D-Index: 9 scientists 97 D-Index: 9 scientists 98 D-Index: 11 scientists 99 D-Index: 12 scientists 100 D-Index: 5 scientists 101 D-Index: 8 scientists 102 D-Index: 4 scientists 103 D-Index: 11 scientists 104 D-Index: 5 scientists 105 D-Index: 9 scientists 106 D-Index: 7 scientists 107 D-Index: 4 scientists 108 D-Index: 8 scientists 109+ D-Index: 99 scientists
30 D-Index 109+

This scientist: 49 D-Index — 66th percentile

66% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 109 D-Index or more.

View D-Index distribution as a table
Number of Plant Science and Agronomy scientists by D-index, Research.com 2026 ranking edition. Based on 6,494 ranked scientists.
D-Index Scientists This scientist
30 200
31 236
32 253
33 283
34 288
35 240
36 246
37 243
38 247
39 229
40 232
41 230
42 228
43 219
44 193
45 164
46 158
47 143
48 131
49 127 49
50 122
51 122
52 110
53 102
54 98
55 79
56 85
57 88
58 91
59 62
60 61
61 59
62 54
63 61
64 59
65 58
66 41
67 49
68 39
69 32
70 40
71 47
72 38
73 28
74 29
75 28
76 22
77 21
78 25
79 26
80 19
81 16
82 12
83 16
84 14
85 11
86 17
87 13
88 10
89 12
90 18
91 16
92 16
93 17
94 12
95 8
96 9
97 9
98 11
99 12
100 5
101 8
102 4
103 11
104 5
105 9
106 7
107 4
108 8
109+ 99
Download as CSV

R. J. Summerfield D-index placement in Plant Science and Agronomy in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 6,494 Plant Science and Agronomy scientists ranked by Research.com in 2026, grouped into 80 ranges running from 30 to 109+ D-Index.
  • R. J. Summerfield, a Plant Science and Agronomy scholar from University of Reading, records 49 D-Index - the 66th percentile of the discipline.
  • 66% of ranked Plant Science and Agronomy scientists score the same or lower than R. J. Summerfield, and about 34% score higher.
  • The median of the discipline falls in the 43 D-Index range, and R. J. Summerfield ranks above the median.
  • The most crowded range is 34 D-Index, holding 288 scientists (4% of the field).
  • 66% of the field sits in the lowest quarter of the value range (up to 49 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 109 D-Index or more, 99 scientists in all (2% of the field).

Overview

What is he best known for?

The fields of study he is best known for:

  • Botany
  • Agronomy
  • Ecology

R. J. Summerfield focuses on Agronomy, photoperiodism, Sowing, Botany and Cultivar. His Germination and Vigna study in the realm of Agronomy connects with subjects such as Relative humidity. His photoperiodism research incorporates elements of Germplasm, Phenology, Plant breeding, Light effect and Poaceae.

His Sowing study integrates concerns from other disciplines, such as Crop and Plant physiology. He mostly deals with Environmental factor in his studies of Botany. His Cultivar research is multidisciplinary, incorporating perspectives in Animal husbandry and Maturity.

His most cited work include:

  • The Influence of Temperature on Seed Germination Rate in Grain Legumes I. A COMPARISON OF CHICKPEA, LENTIL, SOYABEAN AND COWPEA AT CONSTANT TEMPERATURES (260 citations)
  • The Influence of Temperature on Seed Germination Rate in Grain Legumes II. INTRASPECIFIC VARIATION IN CHICKPEA (Cicer arietinum L.) AT CONSTANT TEMPERATURES (184 citations)
  • FRUIT NUMBER IN RELATION TO POLLEN PRODUCTION AND VIABILITY IN GROUNDNUT EXPOSED TO SHORT EPISODES OF HEAT STRESS (165 citations)

What are the main themes of his work throughout his whole career to date?

His primary areas of investigation include Agronomy, photoperiodism, Sowing, Horticulture and Botany. Many of his studies involve connections with topics such as Tropics and Agronomy. His photoperiodism course of study focuses on Phenology and Crop production.

His Sowing research incorporates themes from Plant physiology, Panicle, Crop and Plant breeding. R. J. Summerfield usually deals with Horticulture and limits it to topics linked to Environmental factor and Point of delivery. When carried out as part of a general Botany research project, his work on Ecophysiology, Dry matter and Germination is frequently linked to work in Longevity, therefore connecting diverse disciplines of study.

He most often published in these fields:

  • Agronomy (57.38%)
  • photoperiodism (42.62%)
  • Sowing (42.62%)

What were the highlights of his more recent work (between 1995-2016)?

  • Sowing (42.62%)
  • Agronomy (57.38%)
  • Horticulture (39.34%)

In recent papers he was focusing on the following fields of study:

His primary scientific interests are in Sowing, Agronomy, Horticulture, photoperiodism and Botany. His Sowing study combines topics from a wide range of disciplines, such as Sativum, Cultivar, Crop, Tropics and Plant physiology. His Cultivar research focuses on subjects like Point of delivery, which are linked to Dry weight.

The various areas that R. J. Summerfield examines in his Agronomy study include Agriculture and Temperate climate. His photoperiodism research is multidisciplinary, incorporating elements of Inflorescence, Sorghum, Maturity and Phenology. His Field experiment research extends to Botany, which is thematically connected.

Between 1995 and 2016, his most popular works were:

  • FRUIT NUMBER IN RELATION TO POLLEN PRODUCTION AND VIABILITY IN GROUNDNUT EXPOSED TO SHORT EPISODES OF HEAT STRESS (165 citations)
  • Effects of short episodes of heat stress on flower production and fruit‐set of groundnut (Arachis hypogaea L.) (134 citations)
  • Effect of Temperature and Water Deficit on Water‐Use Efficiency, Carbon Isotope Discrimination, and Specific Leaf Area in Peanut (111 citations)

In his most recent research, the most cited papers focused on:

  • Botany
  • Ecology
  • Agronomy

Agronomy, Sowing, Horticulture, Environmental factor and Botany are his primary areas of study. His Agronomy study incorporates themes from Tropics and photoperiodism. His studies deal with areas such as Sorghum, Maturity and Phenology as well as photoperiodism.

His work carried out in the field of Sowing brings together such families of science as Plant production and Crop. His research integrates issues of Dry matter, Point of delivery and Cultivar in his study of Environmental factor. His study in Growing season and Germination falls within the category of Botany.

Best Publications

  • The Influence of Temperature on Seed Germination Rate in Grain Legumes I. A COMPARISON OF CHICKPEA, LENTIL, SOYABEAN AND COWPEA AT CONSTANT TEMPERATURES

    S. Covell;R. H. Ellis;E. H. Roberts;R. J. Summerfield

  • Measurement and prediction of flowering in annual crops

    E.H. Roberts;R.J. Summerfield

  • World crops: Cool season food legumes

    Unknown

  • FRUIT NUMBER IN RELATION TO POLLEN PRODUCTION AND VIABILITY IN GROUNDNUT EXPOSED TO SHORT EPISODES OF HEAT STRESS

    P.V. Vara Prasad;P.Q. Craufurd;R.J. Summerfield

  • The Influence of Temperature on Seed Germination Rate in Grain Legumes II. INTRASPECIFIC VARIATION IN CHICKPEA (Cicer arietinum L.) AT CONSTANT TEMPERATURES

    R. H. Ellis;S. Covell;E. H. Roberts;R. J. Summerfield

  • Towards the Reliable Prediction of Time to Flowering in Six Annual Crops. I. The Development of Simple Models for Fluctuating Field Environments

    R. J. Summerfield;E. H. Roberts;R. H. Ellis;R. J. Lawn

  • Effect of Temperature and Water Deficit on Water-Use Efficiency, Carbon Isotope Discrimination, and Specific Leaf Area in Peanut

    P. Q. Craufurd;T. R. Wheeler;R. H. Ellis;R. J. Summerfield

  • Carbon and nitrogen metabolism in legume root nodules

    Stephen Rawsthorne;Frank R. Minchin;Rodney J. Summerfield;Claire Cookson

  • Effects of short episodes of heat stress on flower production and fruit‐set of groundnut (Arachis hypogaea L.)

    Pagadala V. Vara Prasad;Peter Q. Craufurd;Rodney J. Summerfield;Timothy R. Wheeler

  • Carbon and nitrogen nutrition of nodulated roots of grain legumes

    F. R. Minchin;R. J. Summerfield;P. Hadley;E. H. Roberts

  • Effects of Temperature and Photoperiod on Flowering in Lentils (Lens culinaris Medic.)

    RJ Summerfield;EH Roberts;William Erskine;RH Ellis

  • Effects of temperature and photoperiod on flowering in chickpeas (Cicer arietinum L. )

    E. H. Roberts;P. Hadley;R. J. Summerfield

  • Sensitivity of Peanut to Timing of Heat Stress during Reproductive Development

    P.V.Vara Prasad;P.Q. Craufurd;R.J. Summerfield

  • Environmental Control of Flowering in Barley (Hordeum vulgare L.). I. Photoperiod Limits to Long-day Responses, Photoperiod-insensitive Phases and Effects of Low-temperature and Short-day Vernalization

    E. H. Roberts;R. J. Summerfield;J. P. Cooper;R. H. Ellis

  • Effects of Temperature and Photoperiod on Flowering in Soya bean [Glycine max (L.) Merrill]: a Quantitative Model

    P. Hadley;E. H. Roberts;R. J. Summerfield;F. R. Minchin

  • A Quantitative Model of Reproductive Development in Cowpea [Vigna unguiculata (L) Walp.] in relation to Photoperiod and Temperature, and Implications for Screening Germplasm

    P. Hadley;E. H. Roberts;R. J. Summerfield;F. R. Minchin

  • Plant Husbandry and Management Techniques for Growing Grain Legumes Under Simulated Tropical Conditions in Controlled Environments

    R. J. Summerfield;P. A. Huxley;F. R. Minchin

  • Photothermal responses of flowering in rice (Oryza sativa)

    R. J. Summerfield;S. T. Collinson;R. H. Ellis;E. H. Roberts

  • Photoperiod, Temperature, and the Interval from Sowing to Tassel Initiation in Diverse Cultivars of Maize

    Unknown

  • Nitrogen Nutrition of Cowpea ( Vigna unguiculata )

    A. R. J. Eaglesham;F. R. Minchin;R. J. Summerfield;P. J. Dart

  • Characterization of responses to temperature and photoperiod for time to flowering in a world lentil collection.

    William Erskine;RH Ellis;RJ Summerfield;EH Roberts

  • Towards the Reliable Prediction of Time to Flowering in Six Annual Crops. II. Soyabean (Glycine Max)

    R. J. Summerfield;R. J. Lawn;A. Qi;R. H. Ellis

  • Effect of high air and soil temperature on dry matter production, pod yield and yield components of groundnut

    P.V. Vara Prasad;P.Q. Craufurd;R.J. Summerfield

Frequent Co-Authors

Richard H. Ellis
Richard H. Ellis University of Reading
E. H. Roberts
E. H. Roberts University of Reading
Peter Craufurd
Peter Craufurd International Maize and Wheat Improvement Center
Tim Wheeler
Tim Wheeler University of Reading
Paul Hadley
Paul Hadley University of Reading
P. V. Vara Prasad
P. V. Vara Prasad Kansas State University
William Erskine
William Erskine University of Western Australia
Fred J. Muehlbauer
Fred J. Muehlbauer Washington State University
Aiming Qi
Aiming Qi University of Hertfordshire
Emyr Owen
Emyr Owen University of Reading

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