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Oil content of cotton seed in Northern Nigeria: 2. varietal and environmental variation

Published online by Cambridge University Press:  27 March 2009

H. E. Gridley  and
J. B. Smithson
H. E. Gridley
Affiliation:
Institute for Agricultural Research, Samaru, Zaria, Nigeria
J. B. Smithson
Affiliation:
Institute for Agricultural Research, Samaru, Zaria, Nigeria
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Summary

Differences between sites accounted for a large proportion of the variation in the oil percentage of cotton seed from variety and agronomic trials conducted in Northern Nigeria but were not consistent between seasons. Reduced oil percentages from the drier areas of the north and from later sowings suggested that length of season is an important factor but insect attack and differences in the amounts of nitrogen, potash and boron applied to the soil also contributed to the variation. Application of insecticide, potash and boron increased and nitrogen decreased oil percentages. The latter effect usually resulted from an increase in seed size without a corresponding increase in oil content. The variation in the oil percentages of commercial varieties derived from the same Nigerian Allen stock and the relatively small interactions between varieties and environments suggested that this character might be improved by selection.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 88 , Issue 3 , June 1977 , pp. 731 - 736
Copyright
Copyright © Cambridge University Press 1977

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