Subject: Yam

324. Production and distribution of virus-free yam (Dioscorea rotundata Poir.)
S. Y. C. Ng

329. Carbon source requirement for the culture of white yam (Dioscorea rotundata) embryos in vitro.
C. E. A. Okezie, S. N. C. Okonkwo, and F. I. O. Nwoke

335. Determination of optimum sett size for white guinea yam (Dioscorea rotundata Poir) seed yam production: trends in sprouting in the presprout nursery and field performance.
C. E. Gyansa-Ameyaw, S. K. Hahn, N. M. Alvarez, and E. V. Doku

342. Manipulation of cultural factors to increase microtuber size and frequency in shoot cultures of food yam, Dioscorea alata L. cv. Oriental Lisbon.
A. Y. Alhassan and S. H. Mantell

349. The response of yam (Dioscorea rotundata Poir.) to various periods of weed esculentus L. Moench), and sweet potato (Ipomoea batatas L. Lam).
G. C. Orkwor, O. U. Okereke, F. O. C. Ezedinma, S. K. Hahn, H. C. Ezumah, and I. O. Akobundu

349. Prospects and constraints to yam production in Ghana.
J. P. Tetteh and C. Saakwa

360. The suitability of Gliricidia sepium in-situ stake on the yield and performance of white yam (Dioscorea rotundata)
O. I. Out and A. A. Agboola.

367. An economic examination of constraints and opportunities in yam (Dioscorea spp.) production in Fako Division, Cameroon.
E. T. Acquah and N.W. Evange

378. The economics of yam (Dioscorea spp.) production in Cameroon: the case of Fako Division. 373 Economics of seed yam production from minisetts in Umudike in southeastern Nigeria : Implications for commercial growers.
N. O. A. Ezeh

382. Yam for foreign exchange: potentials and prospects in Ghana.
S. Asuming-Brempong