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Effect of soil water stress on water economy and oil composition in sunflower (Helianthus annuus L.)

Published online by Cambridge University Press:  27 March 2009

M. Talha  and
F. Osman
M. Talha
Affiliation:
Soils Department, Faculty of Agriculture, Ein-Shams University and Oil Laboratory, National Research Centre, Cairo, Egypt
F. Osman
Affiliation:
Soils Department, Faculty of Agriculture, Ein-Shams University and Oil Laboratory, National Research Centre, Cairo, Egypt
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Summary

In a field experiment sunflower plants were subjected to soil water stress (SWS) at — 15 bar during stages of slow elongation, rapid elongation, flowering and ripening.

Significant decreases in yield, 100-seed weight and oil content were found as a result of SWS. The treatment resulted too in less evapotranspiration and a better water economy for production of seeds and oil.

The iodine value but not the acid or saponification values of the oil was affected by SWS. No qualitative differences in oil composition occurred at different treatments. However, percentage of oleic acid was higher than that of linoleic acid; SWS resulted in a clear tendency for an increase in the ratio of oleic/linoleic acids especially for plants subjected to SWS during elongation stage.

Sunflower plants were more sensitive to SWS during the elongation and flowering stages than during ripening stage

Type
Research Article
Information
The Journal of Agricultural Science , Volume 84 , Issue 1 , February 1975 , pp. 49 - 56
Copyright
Copyright © Cambridge University Press 1975

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References

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