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Organic agriculture and the global food supply

Published online by Cambridge University Press:  04 July 2007

Catherine Badgley
Affiliation:
Museum of Palaeontology, University of Michigan, Ann Arbor, MI 48109, USA.
Jeremy Moghtader
Affiliation:
School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109USA. Department of Horticulture, Michigan State University, East Lansing, MI 48824, USA.
Eileen Quintero
Affiliation:
School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109USA.
Emily Zakem
Affiliation:
School of Art and Design, University of Michigan, Ann Arbor, MI 48109, USA.
M. Jahi Chappell
Affiliation:
Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109, USA.
Katia Avilés-Vázquez
Affiliation:
School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109USA.
Andrea Samulon
Affiliation:
School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109USA.
Ivette Perfecto*
Affiliation:
School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109USA.
*
*Corresponding author: perfecto@umich.edu

Abstract

The principal objections to the proposition that organic agriculture can contribute significantly to the global food supply are low yields and insufficient quantities of organically acceptable fertilizers. We evaluated the universality of both claims. For the first claim, we compared yields of organic versus conventional or low-intensive food production for a global dataset of 293 examples and estimated the average yield ratio (organic:non-organic) of different food categories for the developed and the developing world. For most food categories, the average yield ratio was slightly <1.0 for studies in the developed world and >1.0 for studies in the developing world. With the average yield ratios, we modeled the global food supply that could be grown organically on the current agricultural land base. Model estimates indicate that organic methods could produce enough food on a global per capita basis to sustain the current human population, and potentially an even larger population, without increasing the agricultural land base. We also evaluated the amount of nitrogen potentially available from fixation by leguminous cover crops used as fertilizer. Data from temperate and tropical agroecosystems suggest that leguminous cover crops could fix enough nitrogen to replace the amount of synthetic fertilizer currently in use. These results indicate that organic agriculture has the potential to contribute quite substantially to the global food supply, while reducing the detrimental environmental impacts of conventional agriculture. Evaluation and review of this paper have raised important issues about crop rotations under organic versus conventional agriculture and the reliability of grey-literature sources. An ongoing dialogue on these subjects can be found in the Forum editorial of this issue.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2007

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References

1 Borlaug, N.E. 2000. Ending world hunger: the promise of biotechnology and the threat of antiscience zealotry. Plant Physiology 124:487490.CrossRefGoogle ScholarPubMed
2 Huang, J., Pray, C., and Rozelle, S. 2002. Enhancing the crops to feed the poor. Nature 418:678684.CrossRefGoogle ScholarPubMed
3 Trewavas, A. 2002. Malthus foiled again and again. Nature 418:668670.CrossRefGoogle Scholar
4 Food and Agriculture Organization of the United Nations. 2004. The state of food and agriculture, 2003–2004. Agriculture Series No. 35. Food and Agriculture Organization of the United Nations, Rome.Google Scholar
5 Smil, V. 2000. Feeding the World—A Challenge for the 21st Century. MIT Press, Cambridge, MA.CrossRefGoogle Scholar
6 Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat. 2004. World population prospects: the 2004 revision and world urbanization prospects: the 2003 revision. Available at Web site: http://esa.un.org/unpp (2 May 2005).Google Scholar
7 National Research Council. 1989. Alternative Agriculture. National Academy Press, Washington, DC.Google Scholar
8 Pimentel, D., Harvey, C., Resosudarmo, P., Sinclair, K., Kurz, D., McNair, M., Crist, S., Shpritz, L., Fitton, L., Saffouri, R., and Blair, R. 1995. Environmental and economic cost of soil erosion and conservation benefits. Science 267:11171123.CrossRefGoogle Scholar
9 Pimentel, D. 1996. Green revolution agriculture and chemical hazards. The Science of the Total Environment 188 (Suppl. 1):S86S98.CrossRefGoogle ScholarPubMed
10 Matson, P.A., Parton, W.J., Power, A.G., and Swift, M.J. 1997. Agricultural intensification and ecosystem properties. Science 277:504509.CrossRefGoogle ScholarPubMed
11 Tilman, D. 1999. Global environmental impacts of agricultural expansion: the need for sustainable and efficient practices. Proceedings of the National Academy of Sciences, USA 96:59956000.CrossRefGoogle ScholarPubMed
12 Heller, M.C. and Keoleian, G.A. 2003. Assessing the sustainability of the US food system: a life cycle perspective. Agricultural Systems 76:10071041.CrossRefGoogle Scholar
13 Beman, J.M., Arrigo, K.R., and Matson, P.A. 2004. Agricultural runoff fuels large phytoplankton blooms in vulnerable areas of the ocean. Nature 434:211214.CrossRefGoogle Scholar
14 Relyea, R.A. 2005. The impact of insecticides and herbicides on the biodiversity and productivity of aquatic communities. Ecological Applications 15:618627.CrossRefGoogle Scholar
15 Tilman, D., Cassman, K.G., Matson, P.A., Naylor, R., and Polasky, S. 2002. Agricultural sustainability and intensive production practices. Nature 418:671677.CrossRefGoogle ScholarPubMed
16 Pretty, J.N., Morison, J.I.L., and Hine, R.E. 2003. Reducing food poverty by increasing agricultural sustainability in developing countries. Agriculture, Ecosystems and Environment 95:217234.CrossRefGoogle Scholar
17 Millennium Ecosystem Assessment. 2005. Ecosystems and Human Well-Being: Synthesis. Island Press, Washington, DC.Google Scholar
18 Green, R.E., Cornell, S.J., Scharlemann, J.P.W., and Balmford, A. 2004. Farming and the fate of wild nature. Science 307:550555.CrossRefGoogle ScholarPubMed
19 Food and Agriculture Organization of the United Nations. 2003. FAO Statistical Database. Available at Web site: http://faostat.fao.org/faostat/collections?version=ext&hasbulk=0&subset=agriculture (4 December 2003).Google Scholar
20 Oerke, E.C., Dehne, H.W., Schönbeck, F., and Weber, A. 1994. Crop Production and Crop Protection. Elsevier, Amsterdam, NL.Google Scholar
21 Flint, M.L. 1998. Pests of the Garden and Small Farm. University of California Press, Berkeley, CA.Google Scholar
22 Morales, H. 2002. Pest management in traditional tropical agroecosystems: Lessons for pest prevention research and extension. Integrated Pest Management Reviews 7:145163.CrossRefGoogle Scholar
23 Stanhill, G. 1990. The comparative productivity of organic agriculture. Agriculture, Ecosystems and Environment 30:126.CrossRefGoogle Scholar
24 Leigh, R.A. and Johnson, A.E. 1994. Long-Term Experiments in Agricultural and Ecological Sciences. CAB International, Wallingford, UK.Google Scholar
25 Pimentel, D., Hepperly, P., Hanson, J., Douds, D., and Seidel, R. 2005. Environmental, energetic and economic comparisons of organic and conventional farming systems. BioScience 55:573582.CrossRefGoogle Scholar
26 Giller, K.E., McDonagh, J.F., and Cadisch, G. 1994. Can biological nitrogen fixation sustain agriculture in the tropics? In Syers, J.K. and Rimmer, D.L. (eds). Soil Science and Sustainable Land Management in the Tropics. CAB International, Wallingford, UK. p. 173191.Google Scholar
27 Scialabba, N.El-H. and Hattam, C. (eds). 2002. Organic Agriculture, Environment, and Food Security. Food and Agriculture Organization of the United Nations, Rome, Italy.Google Scholar
28 Willer, H. and Yussefi, M. 2001. Organic Agriculture Worldwide 2001: Statistics and Future Prospects. Foundation for Ecology and Agriculture, Stuttgart, Germany.Google Scholar
29 Stark, P.B. 2004. SticiGui: statistics tools for internet and classroom instruction with a graphic user interface. Available at Web site: http://stat-www.berkeley.edu/users/stark/SticiGui/index.htm (8 August 2004).Google Scholar
30 Brady, N.C. and Weil, R.R. 2002. The Nature and Properties of Soils. 13th ed. Prentice Hall, Upper Saddle River, NJ.Google Scholar
31 United States Geological Survey. 2003. Mineral Commodity Summaries 2003. Government Printing Office, Washington, DC.Google Scholar
32 Lampkin, N. 1994. Organic Farming. Farming Press, Ipswich, UK.Google Scholar
33 Boddey, R.M., de Moraes, J.C., Alves, B.J.R., and Urquiaga, S. 1997. The contribution of biological nitrogen fixation for sustainable agriculture in the tropics. Soil Biology and Biochemistry 29:787799.CrossRefGoogle Scholar
34 Hoyt, G.D. and Hargrove, W.L. 1986. Legume cover crops for improving crop and soil management in the southern United States. Horticultural Science 21:397402.Google Scholar
35 United States Department of Agriculture (USDA). 1998. National Agriculture Statistics. Available at Web site: http://www.usda.gov/nass/pubs/agr98/acro98.htmGoogle Scholar
36 Galloway, J.N., Schlesinger, W.H., Levy, H. II, Michaels, A., and Schnoor, J.L. 1995. Nitrogen fixation: anthropogenic enhancement—environmental response. Global Biogeochemical Cycles 9(2):235252.CrossRefGoogle Scholar
37 Vesterby, M. and Krupa, K.S. 1997. Major land uses in the United States. Economic Research Service, United States Department of Agriculture (USDA), USDA Statistical Bulletin No. 973.Google Scholar
38 Center for Nutrition and Policy Promotion. 2000. Nutrition and Your Health: Dietary Guidelines for Americans. 5th ed. Home and Garden Bulletin No. 232. United States Department of Agriculture and United States Department of Health and Human Services, Washington, DC.Google Scholar
39 Uphoff, N. 2003. Higher yields with fewer external inputs? The system of rice intensification and potential contributions to agricultural sustainability. International Journal of Agricultural Sustainability 1:3850.CrossRefGoogle Scholar
40 Sheehy, J.E., Peng, S., Dobermann, A., Mitchell, P.L., Ferrer, A., Yang, J., Zou, Y., Zhong, Z., and Huang, J. 2004. Fantastic yields in the system of rice intensification: fact or fallacy? Field Crops Research 88:18.CrossRefGoogle Scholar
41 Kumar, V., Mills, D.J., Anderson, J.D., and Mattoo, A.K. 2004. An alternative agriculture system is defined by a distinct expression profile of select gene transcripts and proteins. Proceedings of the National Academy of Sciences, USA 101:1053510540.CrossRefGoogle ScholarPubMed
42 Kramer, A., Doane, T., Horwath, W., and Kessel, C. 2002. Combining fertilizer and organic inputs to synchronize N supply in alternative cropping systems in California. Agriculture, Ecosystems and Environment 91:233243.CrossRefGoogle Scholar
43 Sustainable Agriculture Network. 1998. Managing Cover Crops Profitably, 2nd ed. Sustainable Agriculture Network Handbook Series 3, Beltsville, MD.Google Scholar
44 Radke, J.K., Liebhardt, W.C., Jahnke, R.R., and Peters, S.E. 1987. Legumes in crop rotations as an internal nitrogen source for corn. In Power, J.F. (ed.). Role of Legumes in Conservation Tillage Systems. Soil Conservation Society of America, Ankeny, IA. p. 5657.Google Scholar
45 Dakora, F.D. and Keya, S.O. 1997. Contribution of legume nitrogen fixation to sustainable agriculture in Sub-Saharan Africa. Soil Biology and Biochemistry 29:809817.CrossRefGoogle Scholar
46 Sultan, K., Gintzburger, G., Obaton, M., Robin, C., Touchane, H., and Guckert, A. 2001. Growth and nitrogen fixation of annual Medicago–Rhizobium associations during winter in Mediterranean region. European Journal of Agronomy 15:221229.CrossRefGoogle Scholar
47 Fahrney, K.S., El-Swaify, S.A., Lo, A.K.F., and Joy, R.J. 1987. Maize yields and soil loss with conservation and conventional tillage practices on a tropical Aridisol. In Power, J.F. (ed.). Role of Legumes in Conservation Tillage Systems. Soil Conservation Society of America, Ankeny, IA. p. 5051.Google Scholar
48 Food and Agriculture Organization of the United Nations. 1993. Food and Agriculture Production Yearbook 1992. Statistical Series 112. FAO, Rome, Italy.Google Scholar
49 Vandermeer, J.H. 1990. Intercropping. In Carroll, C.R., Vandermeer, J.H., and Rosset, P. (eds). Agroecology. McGraw Hill, NY. p. 481516.Google Scholar
50 Nair, P.K.R. 1984. Soil Productivity Aspects of Agroforestry: Science and Practice in Agroforestry. International Council for Research in Agroforestry, Nairobi.Google Scholar
51 Dobereiner, J. 1997. Biological nitrogen fixation in the tropics. Soil Biology and Biochemistry 29:771774.CrossRefGoogle Scholar
52 Giller, K.E. and Wilson, K.J. 1991. Nitrogen Fixation in Tropical Cropping Systems. CAB International, Wallingford, UK.Google Scholar
53 Honeycutt, W.C., Clapham, W.M., and Leach, S.S. 1994. A functional approach to efficient nitrogen use in crop production. Ecological Modelling 73:5161.CrossRefGoogle Scholar
54 Drinkwater, L.E., Wagoner, P., and Sarrantonio, M. 1998. Legume-based cropping systems have reduced carbon and nitrogen losses. Nature 396:262265.CrossRefGoogle Scholar
55 Peoples, M.B. and Craswell, E.T. 1992. Biological nitrogen fixation: investments, expectations and actual contributions to agriculture. Plant and Soil 141:1339.CrossRefGoogle Scholar
56 Crews, T.E. and Peoples, M.B. 2004. Legume versus fertilizer sources of nitrogen: ecological tradeoffs and human needs. Agriculture, Ecosystems and Environment 102:279297.CrossRefGoogle Scholar
57 O'Hara, G.W., Howieson, J.G., and Graham, I.P.H. 2002. Nitrogen fixation and agricultural practice. In Leigh, G.J. (ed.). Nitrogen Fixation at the Millennium. Elsevier, Amsterdam, NL. p. 391420.CrossRefGoogle Scholar
58 Piper, J.K. 1998. Growth and seed yield of three perennial grains within monocultures and mixed stands. Agriculture, Ecosystems and Environment 68:111.CrossRefGoogle Scholar
59 Rosset, P. 1999. The multiple functions and benefits of small farm agriculture in the context of global trade negotiations. Food First Policy Brief no. 4.Google Scholar
60 Pimentel, D. 1993. Economics and energetics of organic and conventional farming. Journal of Agricultural and Environmental Ethics 6:5360.CrossRefGoogle Scholar
61 Sorby, K. 2002. What is sustainable coffee? Background Paper to the World Bank Agricultural Technology Note 30. Washington, DC.Google Scholar
62 Granatstein, D. 2003. Tree fruit production with organic farming methods. Wenatchee (WA) Center for Sustainable Agriculture and Natural Resources, Washington State University. Available at the Web site: http://organic.rfrec.wsu.edu/OrganicIFP/OrganicFruitProduction/OrganicMgt.PDF (26 April 2003).Google Scholar
63 Lampkin, N.H. and Padel, S. (eds)1994. The Economics of Organic Farming: An International Perspective. CAB International, Wallingford, UK.CrossRefGoogle Scholar
64 McDonald, A.J., Hobbs, P.R., and Riha, S.J. 2005. Does the system of rice intensification outperform conventional best management? A synopsis of the empirical record. Field Crops Research 96:3136.CrossRefGoogle Scholar
65 Pretty, J. and Hine, R. 2001. Reducing food poverty with sustainable agriculture: A summary of new evidence. Final Report from the ‘SAFE World’ Research Project, University of Essex. Available at Web site: http://www2.essex.ac.uk/ces/ResearchProgrammes/SAFEWexecsummfinalreport.htm (3 December 2003).Google Scholar