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Organic agriculture and the global food supply

  • Catherine Badgley (a1), Jeremy Moghtader (a2) (a3), Eileen Quintero (a2), Emily Zakem (a4), M. Jahi Chappell (a5), Katia Avilés-Vázquez (a2), Andrea Samulon (a2) and Ivette Perfecto (a2)...
Abstract
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.

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*Corresponding author: perfecto@umich.edu
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1 N.E. Borlaug 2000. Ending world hunger: the promise of biotechnology and the threat of antiscience zealotry. Plant Physiology 124:487490.

2 J. Huang , C. Pray , and S. Rozelle 2002. Enhancing the crops to feed the poor. Nature 418:678684.

3 A. Trewavas 2002. Malthus foiled again and again. Nature 418:668670.

8 D. Pimentel , C. Harvey , P. Resosudarmo , K. Sinclair , D. Kurz , M. McNair , S. Crist , L. Shpritz , L. Fitton , R. Saffouri , and R. Blair 1995. Environmental and economic cost of soil erosion and conservation benefits. Science 267:11171123.

9 D. Pimentel 1996. Green revolution agriculture and chemical hazards. The Science of the Total Environment 188 (Suppl. 1):S86S98.

10 P.A. Matson , W.J. Parton , A.G. Power , and M.J. Swift 1997. Agricultural intensification and ecosystem properties. Science 277:504509.

11 D. Tilman 1999. Global environmental impacts of agricultural expansion: the need for sustainable and efficient practices. Proceedings of the National Academy of Sciences, USA 96:59956000.

12 M.C. Heller and G.A. Keoleian 2003. Assessing the sustainability of the US food system: a life cycle perspective. Agricultural Systems 76:10071041.

13 J.M. Beman , K.R. Arrigo , and P.A. Matson 2004. Agricultural runoff fuels large phytoplankton blooms in vulnerable areas of the ocean. Nature 434:211214.

14 R.A. Relyea 2005. The impact of insecticides and herbicides on the biodiversity and productivity of aquatic communities. Ecological Applications 15:618627.

15 D. Tilman , K.G. Cassman , P.A. Matson , R. Naylor , and S. Polasky 2002. Agricultural sustainability and intensive production practices. Nature 418:671677.

16 J.N. Pretty , J.I.L. Morison , and R.E. Hine 2003. Reducing food poverty by increasing agricultural sustainability in developing countries. Agriculture, Ecosystems and Environment 95:217234.

18 R.E. Green , S.J. Cornell , J.P.W. Scharlemann , and A. Balmford 2004. Farming and the fate of wild nature. Science 307:550555.

22 H. Morales 2002. Pest management in traditional tropical agroecosystems: Lessons for pest prevention research and extension. Integrated Pest Management Reviews 7:145163.

23 G. Stanhill 1990. The comparative productivity of organic agriculture. Agriculture, Ecosystems and Environment 30:126.

25 D. Pimentel , P. Hepperly , J. Hanson , D. Douds , and R. Seidel 2005. Environmental, energetic and economic comparisons of organic and conventional farming systems. BioScience 55:573582.

33 R.M. Boddey , J.C. de Moraes , B.J.R. Alves , and S. Urquiaga 1997. The contribution of biological nitrogen fixation for sustainable agriculture in the tropics. Soil Biology and Biochemistry 29:787799.

36 J.N. Galloway , W.H. Schlesinger , H. Levy II, A. Michaels , and J.L. Schnoor 1995. Nitrogen fixation: anthropogenic enhancement—environmental response. Global Biogeochemical Cycles 9(2):235252.

39 N. Uphoff 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.

40 J.E. Sheehy , S. Peng , A. Dobermann , P.L. Mitchell , A. Ferrer , J. Yang , Y. Zou , Z. Zhong , and J. Huang 2004. Fantastic yields in the system of rice intensification: fact or fallacy? Field Crops Research 88:18.

41 V. Kumar , D.J. Mills , J.D. Anderson , and A.K. Mattoo 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.

42 A. Kramer , T. Doane , W. Horwath , and C. Kessel 2002. Combining fertilizer and organic inputs to synchronize N supply in alternative cropping systems in California. Agriculture, Ecosystems and Environment 91:233243.

45 F.D. Dakora and S.O. Keya 1997. Contribution of legume nitrogen fixation to sustainable agriculture in Sub-Saharan Africa. Soil Biology and Biochemistry 29:809817.

46 K. Sultan , G. Gintzburger , M. Obaton , C. Robin , H. Touchane , and A. Guckert 2001. Growth and nitrogen fixation of annual Medicago–Rhizobium associations during winter in Mediterranean region. European Journal of Agronomy 15:221229.

51 J. Dobereiner 1997. Biological nitrogen fixation in the tropics. Soil Biology and Biochemistry 29:771774.

53 W.C. Honeycutt , W.M. Clapham , and S.S. Leach 1994. A functional approach to efficient nitrogen use in crop production. Ecological Modelling 73:5161.

54 L.E. Drinkwater , P. Wagoner , and M. Sarrantonio 1998. Legume-based cropping systems have reduced carbon and nitrogen losses. Nature 396:262265.

55 M.B. Peoples and E.T. Craswell 1992. Biological nitrogen fixation: investments, expectations and actual contributions to agriculture. Plant and Soil 141:1339.

56 T.E. Crews and M.B. Peoples 2004. Legume versus fertilizer sources of nitrogen: ecological tradeoffs and human needs. Agriculture, Ecosystems and Environment 102:279297.

57 G.W. O'Hara , J.G. Howieson , and I.P.H. Graham 2002. Nitrogen fixation and agricultural practice. In G.J. Leigh (ed.). Nitrogen Fixation at the Millennium. Elsevier, Amsterdam, NL. p. 391420.

58 J.K. Piper 1998. Growth and seed yield of three perennial grains within monocultures and mixed stands. Agriculture, Ecosystems and Environment 68:111.

60 D. Pimentel 1993. Economics and energetics of organic and conventional farming. Journal of Agricultural and Environmental Ethics 6:5360.

64 A.J. McDonald , P.R. Hobbs , and S.J. Riha 2005. Does the system of rice intensification outperform conventional best management? A synopsis of the empirical record. Field Crops Research 96:3136.

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Renewable Agriculture and Food Systems
  • ISSN: 1742-1705
  • EISSN: 1742-1713
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