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Crop continuity and prediction of maturity in the crisp lettuce variety Saladin

Published online by Cambridge University Press:  27 March 2009

D. C. E. Wurr ,
Jane R. Fellows  and
R. F. Suckling
D. C. E. Wurr
Affiliation:
Institute of Horticultural Research, Wellesbourne, Warwick CV35 9EF
Jane R. Fellows
Affiliation:
Institute of Horticultural Research, Wellesbourne, Warwick CV35 9EF
R. F. Suckling
Affiliation:
Agricultural Development and Advisory Service, Marston Road, Oxford 0X3 OTP
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Summary

The dates of transplanting and maturity of twenty-four experiments between 1980 and 1986 with the lettuce varieties Saladin and Saladin R 100 were used, together with meteorological data for each crop, to study the planning of crop continuity and the prediction of crop maturity. The interval in days from transplanting to maturity was shown to be a minimum for crops transplanted around the middle of June and was described by a fitted quadratic relationship which accounted for 34·6% of the variance. When expressed in accumulated day-degrees >0 °C the interval increased with later transplanting but a linear relationship accounted for only 22·2% of the variance. However, when expressed as accumulated solar radiation the interval decreased with later transplanting and a linear relationship accounted for 82·2% of the variance. When expressed in effective day-degrees (EDDs) the interval was relatively stable at 589 EDDs (S.D. = 39·5).

Predictions of commercial crop maturity based on these relationships and using a combination of average and observed meteorological data showed that EDDs gave the most accurate prediction. Differences between actual and predicted maturity appeared to be associated with the site of production, suggesting that a ‘site’ factor needs to be incorporated to take account of local differences in temperature, solar radiation and soil type. The use of long-term average day-degree and EDD data was less consistent than estimates of maturity based wholly or predominantly on observed day-degree and EDD data though with solar radiation the reverse was true.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 111 , Issue 3 , December 1988 , pp. 481 - 486
Copyright
Copyright © Cambridge University Press 1988

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References

Arnold, C. Y. (1959). The determination and significance of the base temperature in a linear heat unit system. Proceedings of the American Society for Horticultural Science 74, 430–445.Google Scholar
Gray, D., Tuckwell, M. E. & Hargreaves, G. (1979). Timing of harvests in summer lettuce: comparison of methods of scheduling sowings in drilled and transplanted crops. Experimental Horticulture 31, 35–44.Google Scholar
Greenwood, E. A. N., Boundy, C. A. P., De Boer, E. S. & Power, T. R. (1974). Effect of planting time and plant spacing on maize production on the Swan coastal plain of Western Australia. Australian Journal of Experimental and Animal Husbandry 14, 547–552.CrossRefGoogle Scholar
Kristensen, S., Friis, E., Henriksen, K. & Mikkelsen, S. A. (1987). Application of temperature sums in the timing of production of crisp lettuce. Acta Horticulturae 198, 217–226.CrossRefGoogle Scholar
Madariaga, F. J. & Knott, J. E. (1951). Temperature summations in relation to lettuce growth. Proceedings of the American Society for Horticultural Science 58, 147–152.Google Scholar
Mikkelsen, S. A. (1981). Predicting the date of harvest of vining peas by means of growing-degree-days models. Ada Horticulturae 122, 211–221.CrossRefGoogle Scholar
Ministry of Agriculture, Fisheries and Food (1984). Outdoor lettuce. Booklet 2446. London: MAFF.Google Scholar
Newman, J. E., Cooper, W. C., Reuther, W., Cahoon, G. A. & Peynado, A. (1967). Orange fruit maturity and net heat accumulations. Ground Level Climalography 86, 127–147.Google Scholar
Noguchi, M., Hoshino, K. & Kikkawa, M. (1981). Analysis of factors determining the vegetable crops yield. III. Effect of temperature on growth and dry matter production of lettuce at different growth stages. Bulletin of the Vegetable and Ornamental Crops Research Station A (Ano Mie) No. 9, pp. 47–62.Google Scholar
Scaife, A., Cox, E. F. & Morris, G. E. L. (1987). The relationship between shoot weight, plant density and time during the propagation of four vegetable species. Annals of Botany 59, 325–334.CrossRefGoogle Scholar
Whitfield, W. A. D. (1974). The soils of the National Vegetable Research Station, Wellesbourne. Report of the National Vegetable Research Station for 1973, pp. 21–30.Google Scholar
Wurr, D. C. E. & Fellows, J. R. (1984). The growth of three crisp lettuce varieties from different sowing dates. Journal of Agricultural Science, Cambridge 102, 733–745.CrossRefGoogle Scholar
Wurr, D. C. E., Fellows, J. R. & Pittam, A. J. (1987). The influence of plant raising conditions and transplant age on the growth and development of crisp lettuce. Journal of Agricultural Science, Cambridge 109, 573–581.CrossRefGoogle Scholar
Zink, F. W. & Yamagudhi, M. (1962). Studies on the growth rate and nutrient absorption of head lettuce. Hilgardia 32, 471–500.CrossRefGoogle Scholar