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Dormancy of Urena lobata L. seeds. I. Development of sulphuric ...

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84 P. J. C. Harris (1986) Ghana Jnl agric. Sci. 14-19, 79-84<br />

~iM;hcant role to play :n U.<strong>lobata</strong> cultivatIon. DasGupta, D. K. (I 973b) Potential for commercial fibre<br />

Acknowledgement<br />

The author wishes to express his gratitude to the<br />

University <strong>of</strong> Sierra Leone Research Fund for<br />

financing the study, and to Mr S. A. Harris for his<br />

technical assistance.<br />

REFERENCES<br />

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rate on fiber yield <strong>of</strong> <strong>Urena</strong> <strong>lobata</strong> L. as compared<br />

with kenaf, Hibiscus cannabinus L. J. Am. Soc.<br />

Agron. 37,245-250.<br />

Das Gupta, D. K. (1971) Studies on the crop physiology<br />

and cultural practices <strong>of</strong> <strong>Urena</strong> <strong>lobata</strong> L. for fibre<br />

productioninSierraLeone. I. Crop physiology. Sols<br />

afro 16,127-151.<br />

Das Gupta, D. K. (1973a) Studies on the crop physiology<br />

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production in Sierra Leone. 2. Cultural practices. Sols<br />

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15-21.<br />

Dempsey, J. M. (1975) Fiber crops, p 382. Gainsville:<br />

University Presses <strong>of</strong> Florida.<br />

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Crop Sci. Soc. Fla 30,34-45.<br />

Gerrard, A. (1955) The germination and longevity <strong>of</strong><br />

<strong>seeds</strong> in an equatorial climate. Gdns' Bull. Singapore<br />

14,534-545.<br />

Harris, P. J. C. (1981) Seed viability, dormancy, and<br />

field emergence <strong>of</strong> <strong>Urena</strong> <strong>lobata</strong> L. in Sierra Leone.<br />

Trap. Agric .. Trin. 58, 205-214.<br />

Horn, C. L. & Natal Colon, J. E. (1942) Acid scarification<br />

<strong>of</strong> the seed <strong>of</strong> two Cuban fiber plants. J. Am. Soc.<br />

Agron.34,1137-1138.<br />

Juillet, A. (1952) Etude de la germination d'<strong>Urena</strong><br />

<strong>lobata</strong>. Agron. trap., Nogent 7,487-507.<br />

Kirby, R. H. (1963) Vegetable fibres, pp. 135-136.<br />

London: Leonard Hill (Books) Ltd.

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