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Yield Stability of Cassava During Prolonged Mid-Season Water Stress

Published online by Cambridge University Press:  03 October 2008

Mabrouk A. El-Sharkawy ,
Anna Del Pilar Hernández  and
Clair Hershey
Mabrouk A. El-Sharkawy
Affiliation:
Cassava Program, Centro Internacional de Agricultura Tropical (CIAT), AA 6713, Cali, Colombia, South America
Anna Del Pilar Hernández
Affiliation:
Cassava Program, Centro Internacional de Agricultura Tropical (CIAT), AA 6713, Cali, Colombia, South America
Clair Hershey
Affiliation:
Cassava Program, Centro Internacional de Agricultura Tropical (CIAT), AA 6713, Cali, Colombia, South America
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Summary

Yield stability in cassava requires genotypes that produce well under the variable moisture conditions encountered during the growth cycle. Plant characteristics related to yield stability were studied in two cassava clones subjected to 105 days of water stress in a field drainage lysimeter. Stress conditions commenced 117 days after planting, and the plants were allowed to recover at the end of the stress period for the rest of the growth cycle. Water stress restricted the growth of leaves and stems, but root yields were increased or remained unaffected. Leaf water potential varied little with stress, but gas exchange rates were about 75% those of the control throughout the stress period in both cultivars. Under stress, the plants partially closed their stomata and extracted deep soil moisture slowly. A high yield in both wet and stressed environments was associated with high mean LAI, better leaf retention, and greater partitioning of shoot biomass into leaf formation.

Type
Research Article
Information
Experimental Agriculture , Volume 28 , Issue 2 , April 1992 , pp. 165 - 174
Copyright
Copyright © Cambridge University Press 1992

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References

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