Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-03T05:27:51.298Z Has data issue: false hasContentIssue false
  • English
  • Français

Changes with time of crop yields in a long-term experiment

Published online by Cambridge University Press:  27 March 2009

G. V. Dyke
G. V. Dyke
Affiliation:
Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ
Get access Rights & Permissions [Opens in a new window]

Summary

Yields of the three ‘test’ crops, winter wheat, potatoes, spring barley in the Rothamsted Ley–Arable experiments 1949–69 increased by about 100%, 80%, 40% respectively, each in a period of 19 years. The wheat variety was changed once during the period and this change is enough to explain most of he increase of yield. For potatoes there was no change of variety; the estimated effects of changes in manuring, etc. explain less than one third of the observed increase. For barley two changes of variety explain about one third of the increase; most of the remainder may be explained by improved manuring of preceding crops, especially potatoes. After 1969 the cropping was drastically changed but a few recent yields from other experiments at Rothamsted indicate that the steady rates of increase may have continued at least up to 1980.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 111 , Issue 2 , October 1988 , pp. 317 - 332
Copyright
Copyright © Cambridge University Press 1988

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Baldwin, H. J. (1964). The effect of sprouting the seed and of date of planting on the yield of maincrop potatoes. Experimental Husbandry 11, 83–87.Google Scholar
Bowring, J. D. C. (1964). Spring barley variety trials, 1955–1960. Journal of the National Institute of Agricultural Botany 10, 61–71.Google Scholar
Boyd, D. A. (1966). Rothamsted Ley-Arable rotation experiment. Rothamsted Experimental Station, Report for 1965, pp. 216–221.Google Scholar
Boyd, D. A. (1968). Experiments with ley and arable farming systems. Rothamsted Experimental Station, Report for 1967, pp. 316–331.Google Scholar
Boyd, D. A., Cooke, G. W., Dyke, G. V., Moffatt, J. R. & Warren, R. G. (1962). The Rothamsted Ley-Arable rotation experiment. Rothamsted Experimental Station, Report for 1961, pp. 173–180.Google Scholar
Dyke, G. V. (1956). The effect of date of planting on the yield of potatoes. Journal of Agricultural Science 47, 122–128.CrossRefGoogle Scholar
Dyke, G. V. (1958). Hand and machine planting of potatoes. Experimental Husbandry 3, 54–57.Google Scholar
Dyke, G. V. (1964). Why leys? Experimental Husbandry 10, 101–111.Google Scholar
Dyke, G. V. (1967). Rothamsted Ley-Arable; lodging of cereal test-crops. Rothamsted Experimental Station, Report for 1966, pp. 232–233.Google Scholar
Dyke, G. V. (1968). Field experiments and increases in yield of crops. Journal of the National Institute of Agricultural Botany 11, 329–342.Google Scholar
Fiddian, W. E. H. (1966 a). Wheat, barley and oat varieties completing variety trials in 1965. Journal of the National Institute of Agricultural Botany 10, 387–412.Google Scholar
Fiddian, W. E. H. (1966b). Varieties of spring wheat, winter and spring barley, and winter and spring oats, completing trials 1961–1964. Journal of the National Institute of Agricultural Botany 10, 413–508.Google Scholar
Fiddian, W. E. H. (1967 a). Wheat, barley and oat varieties completing primary trials in 1966. Journal of the National Institute of Agricultural Botany 11, 1—27.Google Scholar
Fiddian, W. E. H. (1967b). Wheat, barley and oat varieties completing primary trials in 1967. Journal of the National Institute of Agricultural Botany 11, 28–53.Google Scholar
Harris, P. M. (ed.) (1978). ThePotato Crop. The scientific basis for improvement. London: Chapman & Hall.CrossRefGoogle Scholar
Harvey, P. N. & Short, J. L. (1959). Effect of date of planting on yield of maincrop potatoes. Experimental Husbandry 4, 7–17.Google Scholar
Jarvis, R. H., Palmer, G. M. & Shotton, F. E. (1973). Effect of length of sprouting period on the yield of Pentland Crown potatoes planted by hand and by machine. Experimental Husbandry 24, 41–47.Google Scholar
Johnston, A. E., Warren, R. G. & Penny, A. (1970). The value of residues from long-period manuring at Rothamsted and Woburn. Rothamsted Experimental Station, Report for 1969, Part 2, pp. 5–90.Google Scholar
Johnston, A. E. (1973). The effects of ley and arable cropping systems on the amounts of soil organic matter in the Rothamsted and Woburn Ley-Arable experiments. Rothamsted Experimental Station, Report for 1972, Part 2, pp. 131–159.Google Scholar
Miller, T. E. & Furber, M. J. (1966). N.A.A.S./N.I.A.B. trials of spring barley varieties, 1960–62. Journal of the National Institute of Agricultural Botany 10, 509–527.Google Scholar
Page, J. B. & Llewellyn, J. C. (1966). N.A.A.S./N.I.A.B. spring barley variety trials, 1955–58. Journal of the National Institute of Agricultural Botany 10, 541–554.Google Scholar
Rothamsted Experimental Station (1970). Details of the Classical and Long-Term Experiments up to 1967.Google Scholar
Rothamsted Experimental Station (1978). Details of the Classical and Long-Term Experiments 1968–1973.Google Scholar
Rothamsted Experimental Station (published annually). Yields of the Field Experiments.Google Scholar
Shotton, F. E. (1964). Storage conditions affecting the sprouting of seed potatoes and their yield. Part I. Comparison of seed potato stores. Experimental Husbandry 11, 1–9.Google Scholar
Shotton, F. E. & Palmer, G. M. (1972). Storage conditions affecting the sprouting of seed potatoes and their yield. Part IV. The length of the sprouting period. Experimental Husbandry 21, 109–122.Google Scholar
Warren, R. G. & Johnston, A. E. (1967). Hoosfield continuous barley. Rothamsted Experimental Station, Report for 1966, pp. 320–338.Google Scholar
Widdowson, F. V., Penny, A. & Williams, R. J. B. (1967). Experiments comparing the effects on yields of potatoes of three methods of applying three amounts of NPK. fertilizer and the residual effects on following winter wheat. Journal of Agricultural Science, Cambridge 69, 247–253.CrossRefGoogle Scholar
Widdowson, F. V. (1973). Results from experiments with wheat and barley measuring the effects of paths on yield. Experimental Husbandry 23, 16–20.Google Scholar