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Studies on some sources of variation in carrot root weight

Published online by Cambridge University Press:  27 March 2009

P. J. Salter ,
I. E. Currah  and
Jane R. Fellows
P. J. Salter
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick CV35 9EF
I. E. Currah
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick CV35 9EF
Jane R. Fellows
Affiliation:
National Vegetable Research Station, Wellesbourne, Warwick CV35 9EF
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Summary

Five investigations were carried out to determine the magnitude of root-size variation within crops of cv. Chantenay Supreme grown under competitive and non-competitive conditions, and to study possible sources of inter-plant variation.

In the first experiment root-size variation from crops grown at a high population density (245 plants/m2) and at a low density (25 plants/m2) were compared over a 21-week period from sowing. The c.v.s of root weight were always higher from the high density than from the low density over the harvesting period from 11 to 21 weeks after sowing, and ranged from 74 to 94% and from 50 to 63%, respectively. A second study showed that even with a very low population density (3 plants/m2) the c.v. of root weight at harvest was 58%. The third study showed that 40% of the root weight variation was accounted for by the time of seedling emergence. The results of a pot experiment indicated that when the size of seed, sowing depth, rooting medium and time of seedling emergence were made as uniform as possible, a very uniform population of roots was produced with a c.v. of root weight of 32%. In the final field experiment when time of seedling emergence, seed size and spatial distribution of the plants were the experimental variables, the results confirmed the importance of variability in time of seedling emergence and seedling size in creating variation at an early stage of growth.

The results of these studies indicate that competition per se was not a prime source of variation in root size but magnified any initial variation within the crop at the time of seedling establishment. The importance of this early establishment phase in determining the spread of root-size distribution within a crop is discussed together with the factors which influence the time of seedling emergence and seedling size.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 96 , Issue 3 , June 1981 , pp. 549 - 556
Copyright
Copyright © Cambridge University Press 1981

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References

REFERENCES

Austin, R. B. & Longden, P. C. (1967). Some effects of seed size and maturity on the yield of carrot crops. Journal of Horticultural Science 42, 339–353.CrossRefGoogle Scholar
Austin, R. B., Longden, P. C. & Hutchinson, J. (1969). Some effects of ‘hardening’ carrot seed. Annals of Botany 33, 883–895.CrossRefGoogle Scholar
Barnes, A. (1981). Studies of variability estimates. National Vegetable Research Station Annual Report for 1980 (in the Press).Google Scholar
Bleasdale, J. K. A. (1963). The bed-system of carrot growing. Ministry of Agriculture, Fisheries and Food. Short Term Leaflet No. 27.Google Scholar
Bufton, L. P. (1978). The influence of seed-drill design on the spatial arrangement of seedlings and on seedling emergence. Ada Horticulturae 72, 135–157.CrossRefGoogle Scholar
Currah, I. E. (1975). Some factors affecting the size of plants in the carrot crop. Ph.D. thesis, University of London.Google Scholar
Currah, I. E. (1978 a). Plant uniformity at harvest related to variation between emerging seedlings. Ada Horticulturae 72, 57–68.CrossRefGoogle Scholar
Currah, I. E. (1978 b). Fluid drilling. World Crops and Livestock 30, 22–24.Google Scholar
Currah, I. E. & Barnes, A. (1979). Vegetable plant part relationships. 1. Effects of time and population density on the shoot and storage root weights of carrot (Daucus carota L.). Annals of Botany 43, 475–486.CrossRefGoogle Scholar
Currah, I. E. & Salter, P. J. (1973). Some combined effects of size grading and ‘hardening’ seed on the establishment, growth and yield of four varieties of carrots. Annals of Botany 37, 709–719.CrossRefGoogle Scholar
D'Agostino, R. B. (1970). Transformation to normality of the null distribution of g. Biometrika 57, 679–681.Google Scholar
Dowker, B. D. (1978). Genetic variation in seedling establishment and subsequent root size variation in carrots. Ada Horticulturae 72, 49–56.CrossRefGoogle Scholar
Gledhill, H. J. V. (1970). A study of factors influencing root size in carrot crops. M.Sc. thesis, University of Dundee.Google Scholar
Gray, D. & Steckel, J. R. A. (1980). Studies on the sources of variation in plant weight in Daucus carota (carrot) and the implications for seed production techniques. Seed Production (ed. Hebblethwaite, P. D.). London: Butterworths.Google Scholar
Hegarty, T. W. (1970). The possibility of increasing field establishment by seed hardening. Horticultural Research 10, 59–64.Google Scholar
Hegarty, T. W. (1976). Field establishment of some vegetable crops: response to a range of soil conditions. Journal of Horticultural Science 51, 133–146.CrossRefGoogle Scholar
Heydecker, W. (1956). Establishment of seedlings in the field. 1. Influence of sowing depth on seedling emergence. Journal of Horticultural Science 31, 76–88.CrossRefGoogle Scholar
Heydecker, W. & Coolbear, P. (1977). Seed treatments for improved performance-survey and attempted prognosis. Seed Science and Technology 5, 353–425.Google Scholar
Koyama, H. & Kira, T. (1956). Intraspecific competition among higher plants. VIII. Frequenoy distribution of individual plant weight as affected by the interaction between plants. Journal of the Institute of Polytechnics, Osaka City University, Series D 7, 73–94.Google Scholar
Lea, S. K. & Nichols, M. A. (1978). Some aspects of seed size and plant spacing on the maturity characteristics of radish. Ada Horticulturae 72, 191–199.CrossRefGoogle Scholar
Mann, L. K. & McGillivray, J. M. (1949). Some factors affecting the size of carrot roots. Proceedings of the American Society for Horticultural Science 54, 311–318.Google Scholar
øyjord, E. (1963). A universal experimental seed drill. Journal of Agricultural Engineering Research 8, 85–87.Google Scholar
Richards, F. J. (1969). The quantitative analysis of growth. In Plant Physiology (ed. Steward, F. C.), VA, pp. 3–76. New York: Academic Press.Google Scholar
Salter, P. J. & Currah, I.E. (1971). Grading and pre-sowing hardening of seed. Annual Report of the National Vegetable Research Station for 1970, p. 74.Google Scholar
Salter, P. J., Currah, I. E. & Fellows, J. R. (1979). The effects of plant density, spatial arrangement and time of harvest on yield and root size in carrots. Journal of Agricultural Science, Cambridge 93, 431–440.CrossRefGoogle Scholar
Salter, P. J., Currah, I. E. & Fellows, J. R. (1980). Further studies on the effects of plant density, spatial arrangement and time of harvest on yield and root size in carrots. Journal of Agricultural Science, Cambridge 94, 465–478.CrossRefGoogle Scholar
Stern, W. R. (1965). The effect of density on the performance of individual plants in subterranean clover swards. Australian Journal of Agricultural Research 16, 541–555.CrossRefGoogle Scholar