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Determinants of spatial diversity in modern wheat: examples from Australia and China

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  • E. Meng, M. Smale
  • Brennan, John P.
  • Hu, Ruifa

Abstract

The spatial distribution of modern varieties, and the genes they embody, has economic value because it affects crop productivity from year to year. Since farmers choose varieties based on observable traits rather than the genes they cannot see, a first step in understanding the spatial distribution of genes is to better understand the determinants of the spatial distribution of varieties. In this paper, we have constructed spatial diversity indices from area distributions of modern wheat varieties in Australia and China. We hypothesise that factors explaining variation in these indices are related to farmers' demand for traits and the supply of varieties, given physical features of the production environment. We test these hypotheses using reduced form equations for three concepts of spatial diversity, richness, abundance and evenness, using Zellner's seemingly unrelated regression (SUR). Spatial diversity indicators and analyses of this type, if more fully developed and targeted to address specific policy issues, may assist in monitoring crop genetic diversity or 'refuge' targets associated with the diffusion of some genetically modified crops. © 2002 Elsevier Science B.V. All rights reserved.

Suggested Citation

  • E. Meng, M. Smale & Brennan, John P. & Hu, Ruifa, 2003. "Determinants of spatial diversity in modern wheat: examples from Australia and China," Agricultural Economics of Agricultural Economists, International Association of Agricultural Economists, vol. 28(1), January.
  • Handle: RePEc:ags:iaaeaj:177852
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    File URL: http://purl.umn.edu/177852
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    References listed on IDEAS

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    1. Andrew P. Barkley & Lori L. Porter, 1996. "The Determinants of Wheat Variety Selection in Kansas, 1974 to 1993," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 78(1), pages 202-211.
    2. Adesina, Akinwumi A. & Zinnah, Moses M., 1993. "Technology characteristics, farmers' perceptions and adoption decisions: A Tobit model application in Sierra Leone," Agricultural Economics, Blackwell, vol. 9(4), pages 297-311, December.
    3. Adesina, Akinwumi A. & Zinnah, Moses M., 1993. "Technology characteristics, farmers' perceptions and adoption decisions: A Tobit model application in Sierra Leone," Agricultural Economics of Agricultural Economists, International Association of Agricultural Economists, vol. 9(4), December.
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    Cited by:

    1. Donfouet, Hermann Pythagore Pierre & Barczak, Aleksandra & Détang-Dessendre, Cécile & Maigné, Elise, 2017. "Crop Production and Crop Diversity in France: A Spatial Analysis," Ecological Economics, Elsevier, vol. 134(C), pages 29-39.
    2. Negassa, Asfaw & Hellin, Jonathan & Shiferaw, Bekele A., 2012. "Determinants of Adoption and Spatial Diversity of Wheat Varieties on Household Farms in Turkey," Socioeconomics Program Working Papers 147106, CIMMYT: International Maize and Wheat Improvement Center.
    3. Saenz, Mariana & Thompson, Eric, 2017. "Gender and Policy Roles in Farm Household Diversification in Zambia," World Development, Elsevier, vol. 89(C), pages 152-169.
    4. Di Falco, Salvatore & Bezabih, Mintewab & Yesuf, Mahmud, 2010. "Seeds for livelihood: Crop biodiversity and food production in Ethiopia," Ecological Economics, Elsevier, vol. 69(8), pages 1695-1702, June.
    5. Rémi Perronne & Mourad Hannachi & Stéphane Lemarié & Aline Fugeray-Scarbel & Isabelle Goldringer, 2016. "L'évolution de la filière blé tendre en France entre 1980 et 2006 : quelle influence sur la diversité cultivée," Post-Print hal-01478404, HAL.
    6. Asrat, Sinafikeh & Yesuf, Mahmud & Carlsson, Fredrik & Wale, Edilegnaw, 2010. "Farmers' preferences for crop variety traits: Lessons for on-farm conservation and technology adoption," Ecological Economics, Elsevier, vol. 69(12), pages 2394-2401, October.
    7. Di Falco, Salvatore & Perrings, Charles, 2005. "Crop biodiversity, risk management and the implications of agricultural assistance," Ecological Economics, Elsevier, vol. 55(4), pages 459-466, December.
    8. Jean-Paul Chavas & Salvatore Di Falco, 2012. "On the Productive Value of Crop Biodiversity: Evidence from the Highlands of Ethiopia," Land Economics, University of Wisconsin Press, vol. 88(1), pages 58-74.
    9. Salvatore Falco & Melinda Smale & Charles Perrings, 2008. "The role of agricultural cooperatives in sustaining the wheat diversity and productivity: the case of southern Italy," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 39(2), pages 161-174, February.
    10. Elisa Gatto & Alba Marino & Guido Signorino, 2013. "Biodiversity and risk management in agriculture: what do we learn from CAP reforms? A farm-level analysis," ERSA conference papers ersa13p805, European Regional Science Association.
    11. Salvatore Di Falco & Jean-Paul Chavas, 2008. "Rainfall Shocks, Resilience, and the Effects of Crop Biodiversity on Agroecosystem Productivity," Land Economics, University of Wisconsin Press, vol. 84(1), pages 83-96.
    12. Aminou Arouna & Stephan Dabbert, 2010. "Determinants of Domestic Water Use by Rural Households Without Access to Private Improved Water Sources in Benin: A Seemingly Unrelated Tobit Approach," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 24(7), pages 1381-1398, May.
    13. Spielman, David J. & Smale, Melinda, 2017. "Policy options to accelerate variety change among smallholder farmers in South Asia and Africa South of the Sahara," IFPRI discussion papers 1666, International Food Policy Research Institute (IFPRI).

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