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Accumulated temperature and maize development in England

Published online by Cambridge University Press:  27 March 2009

E. S. Bunting
E. S. Bunting
Affiliation:
(Plant Breeding Institute, Cambridge)
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Summary

Information is given on dates of sowing and mid-silk for Inra 200 in 40 experiments (two each year at Oxford, 1962–75, and at Cambridge, 1970–5), together with cumulative temperatures between these dates. Two methods of defining effective temperature for maize development have been considered, namely the method advocated by U.K. Meteorological Office with 10 °C as the base temperature (the Ag. Met. method) and that defined in Ontario units. The regression relation between accumulated temperature and dry-matter content of the grain during ripening has also been calculated, from data obtained in the years 1966–74, and assessments made of cumulative totals in Ag. Met. day °C and in Ontario units from the date of silking until the grain D.M. content is 40%, when the crop is considered suitable for ensiling, and from silking until grain D.M. content is 60%, when the crop may be considered ripe.

Cumulative temperature totals were significantly more stable over experiments than time expressed in calendar days. Totals of Ontario units were less variable than totals of Ag. Met. day °C. Estimated requirements for Inra 200 were 405 day °C or 1380 Ontario units from sowing to mid-silk, 255 day °C or 800 Ontario units from silking to 40% D.M. in the grain (for silage crops), and 380 day °C or 1235 Ontario units from silking to 60% D.M. in the grain.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 87 , Issue 3 , December 1976 , pp. 577 - 583
Copyright
Copyright © Cambridge University Press 1976

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References

Aspiazu, C. & Shaw, R. H. (1972). Comparison of several methods of growing degree unit calculations for corn. Iowa State College Journal of Science 46, 435–42.Google Scholar
Brown, D. H. (1972). Heat units for corn in southern Ontario. Ontario Ministry of Agriculture and Food. Agdex 111/31.Google Scholar
Bunting, E. S. (1968). The influence of date of sowing on development and yield of maize. Journal of Agricultural Science, Cambridge 71, 117–25.CrossRefGoogle Scholar
Bunting, E. S. (1972). Ripening in maize: inter-relationships between time, water content and weight of dry material in ripening grain of a flint × dent hybrid (Inra 200). Journal of Agricultural Science, Cambridge 79, 225–33.CrossRefGoogle Scholar
Cross, H. Z. & Zuber, M. S. (1972). Prediction of flowering dates in maize based on different methods of estimating thermal units. Agronomy Journal 64, 351–5.CrossRefGoogle Scholar
Duncan, W. G. 1975. Maize. In Crop Physiology (ed. Evans, L. T.), pp. 23–50. Cambridge University Press.Google Scholar
Gilmore, E. C. & Rogers, J. S. (1958). Heat units as a method of measuring maturity in corn. Agronomy Journal 50, 611–15.CrossRefGoogle Scholar
Hough, M. (1970). Accumulated temperatures above 10 °C in relation to maize. Meteorological Office Agricultural Memorandum, no. 346.Google Scholar
Hough, M. (1972). Maize silage map of England and Wales. Meteorological Office Agricultural Memorandum, no. 421.Google Scholar
Phipps, R. H., Fulford, R. J. & Crofts, F. C. (1975). Relationships between the production of forage maize and accumlated temperature, Ontario heat units and solar radiaton. Agricultural Meteorology 14, 385–97.CrossRefGoogle Scholar
Snedecor, G. W. & Cochran, W. G. (1967). Statistical Methods, 6th ed.Iowa State University Press.Google Scholar