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Growth and Development of Upland Rice at Three Altitudes in the Highlands of Northern Thailand

Published online by Cambridge University Press:  03 October 2008

R. J. Chamberlin  and
Songchao Insomphun
R. J. Chamberlin
Affiliation:
Faculty of Agriculture, Chiang Mai University, Thailand
Songchao Insomphun
Affiliation:
Faculty of Agriculture, Chiang Mai University, Thailand
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Summary

A number of upland rice varieties were grown in the highlands of northern Thailand at altitudes of 800, 1200, and 1450 m in 1978 and 1979. Growth rate declined and growth duration was extended as altitude increased. At the 1200 and 1450 m sites yield was severely restricted by spikelet sterility, probably induced by cool temperatures. Some varieties were completely sterile at the highest altitude, where yields ranged up to 2.6 t ha−1. At 800 m several varieties yielded more than 5 t ha−1 in 1978, but yields at this lower site were reduced by about 20% in 1979. Translocation to the grain of assimilates stored in the vegetative parts appeared to have been restricted. Lodging was a problem at all sites.

Type
Research Article
Information
Experimental Agriculture , Volume 18 , Issue 4 , October 1982 , pp. 363 - 373
Copyright
Copyright © Cambridge University Press 1982

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References

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