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In Situ Conservation Of Crop Genetic Resources In The Mexican Milpa System

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  • Van Dusen, M. Eric

Abstract

This dissertation focuses on the theoretical modeling and empirical testing of household motivations for the in situ conservation of crop genetic resources (CGR). An original household survey is used to test whether the household diversity outcomes are different for the cropping system as a whole, for the principal crop, maize, or for the secondary crops, beans and squash. Agro-ecological characteristics and market characteristics are found to significantly affect the levels of diversity maintained by households. A review of the economic literature relevant to modeling in situ conservation is presented. A theoretical model is developed in which a household's decision to plant a milpa variety is linked to household, agro-ecological, and market variables. A household farm model appropriate to CGR conservation is presented, and extended to the case of missing markets. The agricultural ecology of the Sierra Norte de Puebla is described, as well as the principal CGR in the milpa system. The empirical methodology uses a Poisson regression, for the total number of crop varieties and for each crop group separately. The econometric work is extended to a hurdle model for sample selection, and a SUR model utilizing a Shannon diversity index as a linear measure of diversity. The results from the regressions of household level diversity show that a range of household, village, environmental, and market conditions affect the diversity outcomes. Market integration, measured by distance to a regional market, use of hired labor, and international migration, were found to negatively affect diversity outcomes. Agro-ecological conditions, measured by the number of plots, plots with different slopes, and the high altitude region, all were found to positively increase household diversity outcomes. The econometric findings were different for the combined milpa system than individual crops, and individual crops were affected by different factors. The principal crop, maize, seems mainly affected by the agro-ecological characteristics, while the levels of market integration are found to affect the minor crops, beans and squash. Conclusions are presented on the links between this study and conservation planning issues, and possible directions for future research are discussed.

Suggested Citation

  • Van Dusen, M. Eric, 2000. "In Situ Conservation Of Crop Genetic Resources In The Mexican Milpa System," Dissertations 11941, University of California, Davis, Department of Agricultural and Resource Economics.
  • Handle: RePEc:ags:ucdavd:11941
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    Citations

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    Cited by:

    1. Van Dusen, M. Eric & Gauchan, Devendra & Smale, Melinda, 2005. "On farm conservation of rice biodiversity in Nepal," 2005 Annual meeting, July 24-27, Providence, RI 19210, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
    2. Wale, Edilegnaw & Virchow, Detlef, 2003. "Crop Diversity As The Derived Outcome Of Farmers' 'Survival First' Motives In Ethiopia: What Role For On-Farm Conservation Of Sorghum Genetic Resources?," 2003 Annual Meeting, August 16-22, 2003, Durban, South Africa 25882, International Association of Agricultural Economists.
    3. Nagarajan, Latha & Smale, Melinda & Glewwe, Paul, 2005. "Local Seed Markets and the Determinants of Crop Variety Diversity in Marginal Environments: The Case of Millet in Semi-Arid India," 2005 Annual meeting, July 24-27, Providence, RI 19445, American Agricultural Economics Association (New Name 2008: Agricultural and Applied Economics Association).
    4. Paul Winters & Romina Cavatassi & Leslie Lipper, 2006. "Sowing the Seeds of Social Relations: The Role of Social Capital in Crop Diversity," Working Papers 06-16, Agricultural and Development Economics Division of the Food and Agriculture Organization of the United Nations (FAO - ESA).
    5. Nagarajan, Latha & Smale, Melinda & Glewwe, Paul, 2005. "Comparing farm and village-level determinants of millet diversity in marginal environments of India: the context of seed systems," EPTD discussion papers 139, International Food Policy Research Institute (IFPRI).
    6. Ott, Ingrid & Papilloud, Christian & Z├╝lsdorf, Torben, 2008. "What drives innovation? Causes of and Consequences for nanotechnologies," Kiel Working Papers 1455, Kiel Institute for the World Economy (IfW).
    7. Benin, Samuel & Smale, Melinda & Gebremedhin, Berhanu & Pender, John L. & Ehui, Simeon K., 2003. "The Determinants Of Cereal Crop Diversity On Farms In The Ethiopian Highlands," 2003 Annual Meeting, August 16-22, 2003, Durban, South Africa 25833, International Association of Agricultural Economists.
    8. Latha Nagarajan & Melinda Smale & Paul Glewwe, 2007. "Determinants of millet diversity at the household-farm and village-community levels in the drylands of India: the role of local seed systems," Agricultural Economics, International Association of Agricultural Economists, vol. 36(2), pages 157-167, March.
    9. Smale, Melinda & Olwande, John, 2011. "Is Older Better? Maize Hybrid Change on Household Farms in Kenya," Food Security International Development Working Papers 118474, Michigan State University, Department of Agricultural, Food, and Resource Economics.
    10. Melinda Smale & John Olwande, 2014. "Demand for maize hybrids and hybrid change on smallholder farms in Kenya," Agricultural Economics, International Association of Agricultural Economists, vol. 45(4), pages 409-420, July.
    11. Mintewab Bezabih & Mare Sarr, 2012. "Risk Preferences and Environmental Uncertainty: Implications for Crop Diversification Decisions in Ethiopia," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 53(4), pages 483-505, December.
    12. Wasantha Athukorala & Muditha Karunarathna, 2017. "Conservation of Genetic Resources of Crops: Farmer Preferences for Banana Diversity in Sri Lanka," Working Papers id:11931, eSocialSciences.
    13. Wasantha Athukorala & Muditha Karunarathna, "undated". "Conservation of Genetic Resources of Crops: Farmer Preferences for Banana Diversity in Sri Lanka," Working papers 114, The South Asian Network for Development and Environmental Economics.

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