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Seasonal and Clonal Differences in Shoot Extension Rates and Numbers in Tea (Camellia sinensis)

Published online by Cambridge University Press:  03 October 2008

William Stephens  and
M. K. V. Carr
William Stephens
Affiliation:
Department of Agricultural Water Management, Silsoe College, Silsoe, Bedford MK45 4DT, England
M. K. V. Carr
Affiliation:
Department of Agricultural Water Management, Silsoe College, Silsoe, Bedford MK45 4DT, England
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Summary

Shoot extension rates and numbers recorded over an 18 month period in Tanzania from three contrasting clones were analysed to determine variation between and within seasons. Clonal differences in base temperatures for shoot extension ranged from 10.3 to 14.5°C, whilst variability in the response of shoot growth rates to temperature could be ascribed to the shoot selection technique employed. Considerable clonal variation in shoot population densities occurred, with maxima ranging from 200 to 1200 shoots m−2. Total active shoot extension, the product of shoot growth rates and population densities, varied between 4 and 35 m m−2 week−1, shoot numbers being the dominant component. The implications of these results are discussed in terms of shoot measurement techniques, clonal selection criteria, yield modelling and harvesting policies.

Type
Research Article
Information
Experimental Agriculture , Volume 26 , Issue 1 , January 1990 , pp. 83 - 98
Copyright
Copyright © Cambridge University Press 1990

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References

REFERENCES

Allen, J. C. (1976). A modified sine wave method for calculating degree days. Environmental Entomology 5:388–396.CrossRefGoogle Scholar
Carr, M. K. V. (1971). An assessment of some results of tea-soil-water studies in Southern Tanzania. In Water and the Tea Plant, 21–48 (Eds Carr, M. K. V. and Susan, Carr). Kericho: Tea Research Institute of East Africa.Google Scholar
Carr, M. K. V. (1974). Irrigating seedling tea in Southern Tanzania: Effects on total yields, distribution of yield and water use. Journal of Agricultural Science, Cambridge 83:363–378.CrossRefGoogle Scholar
Carr, M. K. V., Dale, M. O. & Stephens, William (1987). Yield distribution in irrigated tea (Camellia sinensis) at two sites in Eastern Africa. Experimental Agriculture 23:75–85.CrossRefGoogle Scholar
Fordham, R. & Palmer-Jones, R. W. (1977). Simulation of intraseasonal yield fluctuations of tea in Malawi. Experimental Agriculture 13:33–42.CrossRefGoogle Scholar
Grice, W. J. (1982). The formulation of workable plucking policies. Tea Research Foundation of Central Africa Quarterly Newsletter 68:7–17.Google Scholar
Mwakha, E. (1985). Tea shoot growth in the Kenya Highlands. Tea 6(1):5–13.Google Scholar
Obaga, S. O. & Othieno, C. D. (1986). Effect of different shade microenvironment conditions on leaf physiology and shoot growth of tea, Timbilil Estate, Kericho. In Tea Research Foundation of Kenya Annual Report 1986. Tea Board of Kenya.Google Scholar
Obaga, S. O., Squire, G. R. & Langat, J. K. (1988). Altitude, temperature and the growth rate of tea shoots. Tea 9(1):28–33.Google Scholar
Squire, G. R. (1979). Weather, physiology and seasonally of tea (Camellia sinensis) yields in Malawi. Experimental Agriculture 15:321–330.CrossRefGoogle Scholar
Squire, G. R. (1985). Ten years of tea physiology. Tea 6(2):43–48.Google Scholar
Squire, G. R. & Callander, B. A. (1981). Tea plantations. In Water Deficits and Plant Growth, 6:471–510 (Ed. Kozlowski, T. T.). New York: Academic Press.Google Scholar
Stephens, William & Carr, M. K. V. (1989). A water stress index for tea (Camellia sinensis). Experimental Agriculture 25:545–558.CrossRefGoogle Scholar
Stephens, William, Hamer, P. J. C. & Carr, M. K. V. (1988). The yield response of tea to irrigation and fertilizer. Second Annual report to ODA: 1986–87. Silsoe: Silsoe College.Google Scholar
Tanton, T. W. (1981a). The banjhi or dormancy cycle in tea. Experimental Agriculture 17:149–156.CrossRefGoogle Scholar
Tanton, T. W. (1981b). Growth and yield of the tea bush. Experimental Agriculture 17:323–331.CrossRefGoogle Scholar
Tanton, T. W. (1982a). Environmental factors affecting the yield of tea (Camellia sinensis). I. Effects of air temperature. Experimental Agriculture 18:47–52.CrossRefGoogle Scholar
Tanton, T. W. (1982b). Environmental factors affecting the yield of tea (Camellia sinensis). II. Effects of soil temperature, day length and dry air. Experimental Agriculture 18:53–63.CrossRefGoogle Scholar