IDEAS home Printed from
   My bibliography  Save this paper

Development of Gocken Multiplication Technology for Cocoyam


  • Chukwu, G.O
  • Nwosu, K.I
  • Mbanaso, E.N.A
  • Onwubiko, O
  • Okoye, B.C
  • Madu, T.U
  • Ogbonye, H
  • Nwoko, S.U


Low multiplication ratio of cocoyam {Colocasia esculenta (taro) and Xanthosoma mafafa (tannia)} and scarcity of planting materials are major constraints militating against sustainable cocoyam production. During harvesting and processing of cocoyam, very small cormels weighing about 7.0 g (micro cormels) and less are discarded as wastes. These ‘wastes’ usually sprout in the wet season to constitute environmental problem. The Gocken Multiplication Technology is a new technology developed at the National Root Crops Research Institute (NRCRI), Umudike, Nigeria, for very rapid multiplication of cocoyam by recycling ‘wastes’ of cocoyam (≤7.0 g cormels) in cocoyam production. The technology utilizes a seed rate of about 0.35 - 0.45 t/ha compared to 1.0-2.0 t/ha currently in use. Total corm + cormel yield ranged from 7.34-15.5t/ha. Similarly, seed harvest multiplication ratio (SHMR) ranged from 19.0-39.0, while available yield ranged from 89.5-94.7 %. Economic analysis showed that the benefit cost ratio was 4.24:1.0, indicating that the technology is profitable by returning N4.24 to every N1.00 spent.

Suggested Citation

  • Chukwu, G.O & Nwosu, K.I & Mbanaso, E.N.A & Onwubiko, O & Okoye, B.C & Madu, T.U & Ogbonye, H & Nwoko, S.U, 2009. "Development of Gocken Multiplication Technology for Cocoyam," MPRA Paper 17441, University Library of Munich, Germany.
  • Handle: RePEc:pra:mprapa:17441

    Download full text from publisher

    File URL:
    File Function: original version
    Download Restriction: no

    References listed on IDEAS

    1. Chirinko, Robert S, 1993. "Business Fixed Investment Spending: Modeling Strategies, Empirical Results, and Policy Implications," Journal of Economic Literature, American Economic Association, vol. 31(4), pages 1875-1911, December.
    2. Rust, John, 1987. "Optimal Replacement of GMC Bus Engines: An Empirical Model of Harold Zurcher," Econometrica, Econometric Society, vol. 55(5), pages 999-1033, September.
    3. Barro, Robert J, 1972. "Monopoly and Contrived Depreciation," Journal of Political Economy, University of Chicago Press, vol. 80(3), pages 598-602, May-June.
    4. Malcomson, James M., 1975. "Replacement and the rental value of capital equipment subject to obsolescence," Journal of Economic Theory, Elsevier, vol. 10(1), pages 24-41, February.
    5. Dueker Michael & Fischer Andreas & Dittmar Robert, 2007. "Stochastic Capital Depreciation and the Co-movement of Hours and Productivity," The B.E. Journal of Macroeconomics, De Gruyter, vol. 6(3), pages 1-24, January.
    6. Boucekkine, Raouf & Germain, Marc & Licandro, Omar & Magnus, Alphonse, 1998. "Creative Destruction, Investment Volatility, and the Average Age of Capital," Journal of Economic Growth, Springer, vol. 3(4), pages 361-384, December.
    7. Raouf Boucekkine & David de la Croix & Omar Licandro, 2006. "Vintage Capital," Economics Working Papers ECO2006/8, European University Institute.
    8. Boucekkine, Raouf & Germain, Marc & Licandro, Omar, 1997. "Replacement Echoes in the Vintage Capital Growth Model," Journal of Economic Theory, Elsevier, vol. 74(2), pages 333-348, June.
    9. Gerald L. Thompson, 1968. "Optimal Maintenance Policy and Sale Date of a Machine," Management Science, INFORMS, vol. 14(9), pages 543-550, May.
    10. Beatriz Rumbos & Leonardo Auernheimer, 2001. "Endogenous capital utilization in a neoclassical growth model," Atlantic Economic Journal, Springer;International Atlantic Economic Society, vol. 29(2), pages 121-134, June.
    11. Jorgenson, Dale W., 1966. "The Embodiment Hypothesis," Scholarly Articles 3403063, Harvard University Department of Economics.
    12. Cooley, Thomas F. & Greenwood, Jeremy & Yorukoglu, Mehmet, 1997. "The replacement problem," Journal of Monetary Economics, Elsevier, vol. 40(3), pages 457-499, December.
    13. Steve Ambler & Alain Paquet, 1992. "Stochastic Depreciation and the Business Cycle Puzzle," Cahiers de recherche CREFE / CREFE Working Papers 8, CREFE, Université du Québec à Montréal.
    14. S. K. Bhattacharyya, 1965. "Capital Longevity and Economic Growth," Review of Economic Studies, Oxford University Press, vol. 32(1), pages 39-46.
    15. Epstein, L. & Denny, M., 1980. "Endogenous capital utilization in a short-run production model : Theory and an empiral application," Journal of Econometrics, Elsevier, vol. 12(2), pages 189-207, February.
    16. Solow, Robert M, 1997. "Is There a Core of Usable Macroeconomics We Should All Believe In?," American Economic Review, American Economic Association, vol. 87(2), pages 230-232, May.
    17. McHugh, Richard & Lane, Julia, 1987. "The Age of Capital, the Age of Utilized Capital, and Tests of the Embodiment Hypothesis," The Review of Economics and Statistics, MIT Press, vol. 69(2), pages 362-367, May.
    18. Bitros, George C. & Flytzanis, Elias, 2009. "Utilization and maintenance in a model with scrapping," European Journal of Operational Research, Elsevier, vol. 194(2), pages 551-573, April.
    19. R. M. Solow & J. Tobin & C. C. von Weizsäcker & M. Yaari, 1966. "Neoclassical Growth with Fixed Factor Proportions," Review of Economic Studies, Oxford University Press, vol. 33(2), pages 79-115.
    20. Boucekkine, Raouf & Martinez, Blanca, 2003. "Replacement, adoption and economic dynamics: lessons from a canonical creative destruction model," Structural Change and Economic Dynamics, Elsevier, vol. 14(3), pages 339-359, September.
    21. Swan, Peter L, 1977. "Product Durability under Monopoly and Competition: Comment," Econometrica, Econometric Society, vol. 45(1), pages 229-235, January.
    22. Swan, Peter L, 1972. "Optimum Durability, Second-Hand Markets, and Planned Obsolescence," Journal of Political Economy, University of Chicago Press, vol. 80(3), pages 575-585, May-June.
    23. Brown, Murray & Chang, Winston W, 1976. "Capital Aggregation in a General Equilibrium Model of Production," Econometrica, Econometric Society, vol. 44(6), pages 1179-1200, November.
    24. Bitros, George C. & Hritonenko, Natali & Yatsenko, Yuri, 2007. "Investment, replacement and scrapping in a vintage capital model with embodied technological change," MPRA Paper 3619, University Library of Munich, Germany.
    25. Chatterjee, Santanu, 2005. "Capital utilization, economic growth and convergence," Journal of Economic Dynamics and Control, Elsevier, vol. 29(12), pages 2093-2124, December.
    26. Gylfason, Thorvaldur & Zoega, Gylfi, 2001. "Obsolescence," CEPR Discussion Papers 2833, C.E.P.R. Discussion Papers.
    27. Giovanni Dosi & Giorgio Fagiolo & Andrea Roventini, 2006. "An Evolutionary Model of Endogenous Business Cycles," Computational Economics, Springer;Society for Computational Economics, vol. 27(1), pages 3-34, February.
    28. Ambler, Steve & Paquet, Alain, 1994. "Stochastic Depreciation and the Business Cycle," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 35(1), pages 101-116, February.
    29. Parks, Richard W, 1979. "Durability, Maintenance and the Price of Used Assets," Economic Inquiry, Western Economic Association International, vol. 17(2), pages 197-217, April.
    30. Leonardo Auernheimer, 1986. "Variable Depreciation and Some of Its Implications," Canadian Journal of Economics, Canadian Economics Association, vol. 19(1), pages 99-113, February.
    31. repec:adr:anecst:y:2000:i:58:p:05 is not listed on IDEAS
    32. Hulten, Charles R. & Wykoff, Frank C., 1981. "The estimation of economic depreciation using vintage asset prices : An application of the Box-Cox power transformation," Journal of Econometrics, Elsevier, vol. 15(3), pages 367-396, April.
    33. Greenwood, Jeremy & Hercowitz, Zvi & Huffman, Gregory W, 1988. "Investment, Capacity Utilization, and the Real Business Cycle," American Economic Review, American Economic Association, vol. 78(3), pages 402-417, June.
    34. Coase, Ronald H, 1972. "Durability and Monopoly," Journal of Law and Economics, University of Chicago Press, vol. 15(1), pages 143-149, April.
    35. Kinokuni, Hiroshi, 1999. "Repair Market Structure, Product Durability, and Monopoly," Australian Economic Papers, Wiley Blackwell, vol. 38(4), pages 343-353, December.
    36. Dueker, Michael & Fischer, Andreas M, 2002. "Fixing Swiss Potholes: The Importance of Improvements," CEPR Discussion Papers 3159, C.E.P.R. Discussion Papers.
    37. repec:adr:anecst:y:2000:i:58:p:06 is not listed on IDEAS
    38. E. Kleiman & T. Ophir, 1966. "The Durability of Durable Goods," Review of Economic Studies, Oxford University Press, vol. 33(2), pages 165-178.
    39. Paul Zarembka, 1975. "Capital Heterogeneity, Aggregation, and the Two-Sector Model," The Quarterly Journal of Economics, Oxford University Press, vol. 89(1), pages 103-114.
    40. Michael Waldman, 1993. "A New Perspective on Planned Obsolescence," The Quarterly Journal of Economics, Oxford University Press, vol. 108(1), pages 273-283.
    41. Mann, Duncan P., 1992. "Durable goods monopoly and maintenance," International Journal of Industrial Organization, Elsevier, vol. 10(1), pages 65-79, March.
    Full references (including those not matched with items on IDEAS)

    More about this item


    Gocken; very rapid multiplication; technology and cocoyam;

    JEL classification:

    • Q1 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture
    • Q19 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Other
    • Q10 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - General

    NEP fields

    This paper has been announced in the following NEP Reports:


    Access and download statistics


    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:pra:mprapa:17441. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Joachim Winter). General contact details of provider: .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.