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Effect of varying the time of the first harvest, and of late planting, on double-harvest yield of yam (Dioscorea rotundata) in field plots

Published online by Cambridge University Press:  27 March 2009

I. C. Onwueme
I. C. Onwueme
Affiliation:
Plant Science Department, University of Ife, Ile-Ife, Nigeria
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Summary

Setts of white yam (cv. Ogojo) each weighing 225 g were planted in mid·February. They were double-harvested, first in early August, early September or early October, and second in early November. The control was single-harvested in early November. The later the time of the first harvest, the greater the first-harvest yield and the higher the percentage of mature and marketable tubers. Delaying the first harvest, however, led to decreasing yields from the second harvest. Double harvesting never gave a significantly higher yield than that obtained from a single harvest. When the first harvest was taken in September, the combined yield from double harvesting was significantly lower than that of the single November harvest. In a study of the effect of sowing date on yield, late planting (April) resulted in lower first harvest and total yields than early (February) planting, but the second-harvest yield was the same. Supplementary watering of early yam plantings did not markedly accelerate emergence or increase yield.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 88 , Issue 3 , June 1977 , pp. 737 - 741
Copyright
Copyright © Cambridge University Press 1977

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References

Chinwuba, P. M. (1971). Review of yam production in Nigeria during the last ten years. Root and Tuber Crops in West Africa: Seminar, Ibadan, Nigeria, 1971.Google Scholar
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