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Research in organic production systems – past, present and future

Published online by Cambridge University Press:  18 September 2007

C. A. WATSON ,
R. L. WALKER  and
E. A. STOCKDALE
C. A. WATSON*
Affiliation:
SAC, Craibstone Estate, Aberdeen AB21 9YA, UK
R. L. WALKER
Affiliation:
SAC, Craibstone Estate, Aberdeen AB21 9YA, UK
E. A. STOCKDALE
Affiliation:
School of Agriculture Food and Rural Development, Newcastle University, King George VI Building, Newcastle-upon-Tyne NE1 7RU, UK
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

A large body of published research now exists on economic, social, technical and policy related aspects of organic production. The dramatic increase in published research over the last 20 years reflects not only the existence of policy support for organic farming in some countries but also the availability of government funding for research on organic farming. This has resulted in a broadening out of organic research from privately funded, specifically organic research organizations, into universities and mainstream research institutes. In parallel, publication of research results from organic farming has increasingly appeared in refereed literature in addition to literature sources more available to farmers and advisors. Research scientists from Europe, North America and Australasia have all made important contributions to the peer-reviewed literature. The literature is dominated by comparisons of organic and other forms of agriculture, although in many cases these comparisons are not fully valid. Research directed specifically at organic systems is often much more valuable in developing improved production systems than comparative research. Research on organic farming embodies both holistic and reductionist research approaches. Trans-disciplinary research also has an important role to play in understanding the complexities of the ecological approach to agriculture typified by organic farming. Working within the principles and standards of organic agriculture will mean that some research will always be specific to organic production systems. However, in future an increased transfer of knowledge from organic to conventional agriculture and vice versa is envisaged.

Type
Review Article
Information
The Journal of Agricultural Science , Volume 146 , Issue 1 , February 2008 , pp. 1 - 19
Copyright
Copyright © Cambridge University Press 2007

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References

REFERENCES

Acs, S., Berentsen, P. B. M. & Huirne, R. B. M. (2005). Modelling conventional and organic farming: a literature review. Njas-Wageningen Journal of Life Sciences 53, 1–18.CrossRefGoogle Scholar
ACOS (2006). Issues for organic food and farming in the UK. Available online at http://www.defra.gov.uk/FARM/organic/standards/acos/pdf/acos-rd-0606supp.pdf (verified 19/7/07).Google Scholar
Ahrenhöfer, U. (1986). Agrochemical residues in organic and conventional food: a critical review. In The Importance of Biological Agriculture in a World of Diminishing Resources (Eds Vogtmann, H., Boehncke, E. & Fricke, I.), pp. 223–236. Witzenhausen, Germany: Verlagsgruppe.Google Scholar
Alrøe, H. F. & Kristensen, E. S. (2002). Towards a systemic research methodology in agriculture: rethinking the role of values in science. Agriculture and Human Values 19, 3–23.CrossRefGoogle Scholar
Andow, D. A. & Zwahlen, C. (2006). Assessing environmental risks of transgenic plants. Ecology Letters 9, 196–214.CrossRefGoogle ScholarPubMed
Andrews, S. S., Mitchell, J. P., Mancinelli, R., Karlen, D. L., Hartz, T. K., Horwath, W. R., Pettygrove, G. S., Scow, K. M. & Munk, D. S. (2002). On-farm assessment of soil quality in California's Central Valley. Agronomy Journal 94, 12–23.Google Scholar
Atkinson, D. & Watson, C. A. (2000). The research needs of organic farming: distinct or just part of agricultural research? In Proceedings of the BCPC Conference – Pests & Diseases 2000, pp. 151–158. Alton, Hampshire: British Crop Protection Council.Google Scholar
Atkinson, D., Watson, C. A., Pearce, B., Woodward, L., Wolfe, M. S., Welsh, J. P. & Nowack, K. (2002). Organic agriculture and GM crops. In Proceedings of the BCPC Conference – Pests & Diseases 2002, pp. 523–530. Alton, Hampshire: British Crop Protection Council.Google Scholar
Avery, D. T. (1998). The hidden dangers of organic food. American Outlook Fall 1998, 19–22.Google Scholar
Baker, B. P., Benbrook, C. M., Groth, E. & Benbrook, K. L. (2002). Pesticide residues in conventional, integrated pest management (IPM)-grown and organic foods: insights from three US data sets. Food Additives and Contaminants 19, 427–446.CrossRefGoogle ScholarPubMed
Balfour, E. (1943). The Living Soil. London: Faber and Faber.Google Scholar
Bellon, M. R. (2001). Participatory Research Methods for Technology Evaluation: A Manual for Scientists Working with Farmers. Mexico, DF: CIMMYT.Google Scholar
Bender, M. H. (2001). An economic comparison of traditional and conventional agricultural systems at a county level. American Journal of Alternative Agriculture 16, 2–15.CrossRefGoogle Scholar
Bengtsson, H., Oborn, I., Jonsson, S., Nilsson, I. & Andersson, A. (2003). Field balances of some mineral nutrients and trace elements in organic and conventional dairy farming – a case study at Ojebyn, Sweden. European Journal of Agronomy 20, 101–116.CrossRefGoogle Scholar
Blakemore, R. J. (2000). Ecology of earthworms under the ‘Haughley Experiment’ of organic and conventional management regimes. Biological Agriculture and Horticulture 18, 141–159.CrossRefGoogle Scholar
Bourn, D. & Prescott, J. (2002). A comparison of the nutritional value, sensory qualities and food safety of organically and conventionally produced foods. Critical Reviews in Food Science and Nutrition 42, 1–34.CrossRefGoogle ScholarPubMed
Buchting, A. J. & Elmsheuser, H. A. (1978). Some tasks of plant breeding in view of future restrictions in the field of agricultural production resources: an interdisciplinary study. Berichte über Landwirtschaft 56, 690–711.Google Scholar
Carpenter-Boggs, L., Kennedy, A. C. & Reganold, J. P. (2000). Organic and biodynamic management: effects on soil biology. Soil Science Society of America Journal 64, 1651–1659.CrossRefGoogle Scholar
Carson, R. (1962). Silent Spring. Boston, MA, USA: Houghton Mifflin.Google Scholar
Cerf, M., Gibbon, D., Hubert, B., Ison, R., Jiggins, J., Paine, M., Proost, J. & Röling, N. (2000). Cow Up A Tree. Knowing and Learning for Change in Agriculture and Rural Development. Case Studies from Industrialised Countries. Paris: INRA Éditions.Google Scholar
Cobb, D., Feber, R., Hopkins, A., Stockdale, L., O'Riordan, T., Clements, B., Firbank, L., Goulding, K., Jarvis, S. & MacDonald, D. (1999). Integrating the environmental and economic consequences of converting to organic agriculture: evidence from a case study. Land Use Policy 16, 207–221.CrossRefGoogle Scholar
Conford, P. (2001). The Origins of the Organic Movement. Edinburgh, UK: Floris Books.Google Scholar
Colloquium of Organic Researchers (2002). Proceedings of the UK Organic Research 2002 Conference: Organic Research in Context. Aberystwyth: Organic Centre Wales.Google Scholar
Cormack, W. F. (1999). Testing a stockless arable organic rotation on a fertile soil. In Designing and Testing Crop Rotations for Organic Farming: Conference Proceedings (Eds Olesen, J. E., Eltun, R., Gooding, M. J., Jensen, E. S. & Köpke, U.), pp. 115–124. Denmark: Danish Research Centre for Organic Farming.Google Scholar
Cormack, W. F., Shepherd, M. & Wilson, D. W. (2003). Legume species and management for stockless organic farming. Biological Agriculture and Horticulture 21, 383–398.CrossRefGoogle Scholar
Dalrymple, D. (2006). Setting the agenda for science and technology in the public sector: the case of international agricultural research. Science and Public Policy 33, 277–290.CrossRefGoogle Scholar
Davies, G., Turner, R., Bond, B. & Gibbon, D. (2006). Knowledge development for organic systems: An example of weed management. Aspects of Applied Biology 79, 107–110.Google Scholar
DEFRA (2006). Stakeholders issues and aspirations to inform future public funded research in organic farming (OF0350). Available online at http://www2.defra.gov.uk/research/Project_Data/More.asp?I=OF0350#Docs (verified 19/7/07).Google Scholar
Delate, K. & Cambardella, C. A. (2004). Agroecosystem performance during transition to certified organic grain production. Agronomy Journal 96, 1288–1298.CrossRefGoogle Scholar
Drinkwater, L. E., Wagoner, P. & Sarrantonio, M. (1998). Legume-based cropping systems have reduced carbon and nitrogen losses. Nature 396, 262–265.CrossRefGoogle Scholar
European Commission (1991). Council Regulation (EEC) No 2092/91 of 24 June 1991 on Organic Production of Agricultural Products and Indications referring thereto on Agricultural Products and Foodstuffs. Brussels: Commission of the European Communities. Available online at: http://eur-lex.europa.eu/LexUriServ/site/en/consleg/1991/R/01991R2092-20070101-en.pdf (verified 19/7/07).Google Scholar
European Commission (1999). Council Regulation (EC) No 1804/1999 of 19 July 1999 Supplementing Regulation (EEC) No. 2092/91 on Organic Production of Agricultural Products and Indications referring thereto on Agricultural Products and Foodstuffs to include Livestock Production. Brussels: Commission of the European Communities. Available online at: http://europa.eu.int/eur-lex/pri/en/oj/dat/1999/l_222/l_22219990824en00010028.pdf (verified 19/7/07).Google Scholar
European Commission (2004). Communication from the Commission to the Council and the European Parliament: European Action Plan for Organic Food and Farming {SEC(2004)739} (plus annexe). Brussels: Commission of the European Communities. Available online at: http://ec.europa.eu/agriculture/qual/organic/plan/index_en.htm (verified 19/7/07).Google Scholar
Entz, M. H., Guilford, R. & Gulden, R. (2001). Crop yield and soil nutrient status on 14 organic farms in the eastern portion of the northern Great Plains. Canadian Journal of Plant Science 81, 351–354.CrossRefGoogle Scholar
Finamore, A., Britti, M. S., Roselli, M., Bellovino, D., Gaetani, S. & Mengheri, E. (2004). Novel approach for food safety evaluation. Results of a pilot experiment to evaluate organic and conventional foods. Journal of Agriculture and Food Chemistry 52, 7425–7431.CrossRefGoogle ScholarPubMed
Fowler, S. M., Watson, C. A. & Wilman, D. (1993). N, P and K on organic farms: herbage and cereal production, purchases and sales. Journal of Agricultural Science, Cambridge 120, 353–360.CrossRefGoogle Scholar
Fowler, S. M., Lampkin, N. & Midmore, P. (2000). Organic Farm Incomes in England and Wales 1995/96–1997/98. Aberystwyth, UK: Institute of Rural Studies, University of Wales.Google Scholar
Fredriksson, H., Baky, A., Bernesson, S., Nordberg, A., Noren, O. & Hansson, P. A. (2006). Use of on-farm produced biofuels on organic farms: evaluation of energy balances and environmental loads for three possible fuels. Agricultural Systems 89,184–203.CrossRefGoogle Scholar
Fuller, R. J., Norton, L. R., Feber, R. E., Johnson, P. J., Chamberlain, D. E., Joys, A. C., Mathews, F., Stuart, R. C., Townsend, M. C., Manley, W. J., Wolfe, M. S., MacDonald, D. W. & Firbank, L. G. (2005). Benefits of organic farming to biodiversity vary among taxa. Biology Letters 1, 431–434.CrossRefGoogle ScholarPubMed
Garforth, C., Angell, B., Archer, J. & Green, K. (2003). Fragmentation or creative diversity? Options in the provision of land management advisory services. Land Use Policy 20, 323–333.CrossRefGoogle Scholar
Haggar, R. J. & Padel, S. (1996). Conversion to Organic Milk Production. IGER Technical Review No. 4. Aberystwyth, UK: Institute of Grassland & Environmental Research.Google Scholar
Halberg, N., Alroe, H. F., Knudsen, M. T. & Kristensen, E. S. (2006). Global Development of Organic Agriculture: Challenges and Prospects. Wallingford, UK: Commonwealth Agricultural Bureaux International.CrossRefGoogle Scholar
Halford, N. G. (2004). Prospects for genetically modified crops. Annals of Applied Biology 145, 17–24.CrossRefGoogle Scholar
Haring, A. M., Dabbert, S., Aurbacher, J., Buchler, B., Eichert, C., Gambelli, D., Lampkin, N., Offermann, F., Olmos, S., Tuson, J. & Zanoli, R. (2004). Organic Farming and Measures of European Agricultural Policy. Organic Farming in Europe: Economics and Policy, Volume 11. Hohenheim: University of Hohenheim.Google Scholar
Heckman, J. (2006). A history of organic farming: transitions from Sir Albert Howard's War in the Soil to the USDA National Organic Programme. Renewable Agriculture and Food Systems 21, 143–150.CrossRefGoogle Scholar
Hill, S. B. & MacRae, R. J. (1992). Organic farming in Canada. Agriculture, Ecosystems and Environment 39, 71–84.CrossRefGoogle Scholar
Hirt, H., Bestmann, M., Nauta, W., Philipps, L. & Spoolder, H. (2001). Breeding for health and welfare. In Breeding and Feeding for Animal Health and Welfare in Organic Livestock Systems. Proceedings of the 4th NAHWOA Workshop: Network for Animal Health and Welfare in Organic Agriculture, Wageningen, Netherlands, 24–27 March 2001 (Eds Hovi, M. & Baars, T.), pp. –119. Reading, UK: University of Reading.Google Scholar
Høgh-Jensen, H. (1999). The proportion of green fallow in stockless farming systems: grain N yield, N leaching and soil organic N. In Designing and Testing Crop Rotations for Organic Farming: Conference Proceedings (Eds Olesen, J. E., Eltun, R., Gooding, M. J., Jensen, E. S. & Köpke, U.), pp. 223–234. Denmark: Danish Research Centre for Organic Farming.Google Scholar
Hole, D. G., Perkins, A. J., Wilson, J. D., Alexander, I. H., Grice, P. V. & Evans, A. D. (2005). Does organic farming benefit biodiversity? Biological Conservation 122, 113–130.CrossRefGoogle Scholar
Holt, G. & Reed, M. (2006). Sociological Perspectives of Organic Agriculture: from Pioneer to Policy. Wallingford: CAB International.CrossRefGoogle Scholar
Howard, A. (1943). An Agricultural Testament. Oxford: Oxford University Press.Google Scholar
Huesemann, M. H. (2001). Can pollution problems be effectively solved by environmental science and technology? An analysis of critical limitations. Ecological Economics 37, 271–287.CrossRefGoogle Scholar
Huesemann, M. H. (2002). The inherent biases in environmental research and their effects on public policy. Futures 34, 621–633.CrossRefGoogle Scholar
Huxham, S. K., Sparkes, D. L. & Wilson, P. (2005). The effect of conversion strategy on the yield of the first organic crop. Agriculture, Ecosystems and Environment 106, 345–357.CrossRefGoogle Scholar
IFOAM (2005). The Principles of Organic Agriculture. Bonn, Germany: IFOAM. Available online at http://www.ifoam.org/about_ifoam/principles/index.html (verified 23/7/07).Google Scholar
Johnson, N. L., Lilja, N. & Ashby, J. A. (2003). Measuring the impact of user participation in agricultural and natural resource management research. Agricultural Systems 78, 287–306.CrossRefGoogle Scholar
Kaffka, S. R. (1985). Thirty years of energy use, nutrient cycling and yield on a self-reliant dairy farm. In Sustainable Agriculture and Integrated Farming Systems: 1984 Conference Proceedings (Eds Edens, T. C., Fridgen, C. & Butterfield, S. L.), pp. 143–158. East Lansing, MI, USA: Michigan State University Press.Google Scholar
Kaffka, S. & Koepf, H. H. (1989). A case study on the nutrient regime in sustainable farming. Biological Agriculture and Horticulture 6, 89–106.CrossRefGoogle Scholar
Kijlstra, A. & Eijck, I. A. J. M. (2006). Animal health in organic livestock production systems: a review. Njas-Wageningen Journal of Life Sciences 54, 77–94.CrossRefGoogle Scholar
Koepf, H. H. (1993). Research in Biodynamic Agriculture: Methods and Results. Kimberton PA, USA: Bio-Dynamic Farming and Gardening Association Inc.Google Scholar
Kramer, S. B., Reganold, J. P., Glover, J. D., Bohannan, B. J. M. & Mooney, H. A. (2006). Reduced nitrate leaching and enhanced denitifer activity and efficiency in organically fertilized soils. Proceedings of the National Academy of Sciences of the United States of America 103, 4522–4527.CrossRefGoogle ScholarPubMed
Krell, R. & Zanoli, R. (2000). Research Methodologies in Organic Farming: On-farm Participatory Research. REU Technical Series, 63. Rome: FAO. Available online at http://www.fao.org/DOCREP/006/AD237E/AD237E00.HTM (verified 23/7/07).Google Scholar
Kristiansen, P., Taji, A. & Reganold, J. (2006). Organic Agriculture. A Global Perspective. Collingwood, Australia: CSIRO Publishing.CrossRefGoogle Scholar
Lampkin, N. (1990). Organic Farming. Ipswich, UK: Farming Press.Google Scholar
Lampkin, N. H. (1994). Researching organic farming systems. In The Economics of Organic Farming: An International Perspective (Eds Lampkin, N. H. & Padel, S.), pp. 27–44. Wallingford, UK: CAB International.CrossRefGoogle Scholar
Lange, S., Williges, U., Saxena, S. & Willer, H. (2006). Research in Organic Food and Farming. Reports on Organisation and Conduction of Research Programmes in 11 European Countries. Bonn, Germany: Bundesanstalt für Landwirtschaft und Ernährung (BLE)/Federal Agency for Agriculture and Food.Google Scholar
Lauridsen, C., Jørgensen, H., Halekoh, U., Christensen, L. P. & Brandt, K. (2005). Organic diet enhanced the health of rats. DARCOFenews, Newsletter from Danish Research Centre for Organic Farming, March 2005, No. 1. Available online at http://www.darcof.dk/enews/mar05/health.html (verified 23/7/07).Google Scholar
Leake, A. R. (1996). The effect of cropping sequences and rotational management: an economic comparison of conventional, integrated and organic systems. Aspects of Applied Biology 47, 185–195.Google Scholar
Lockeretz, W. (2000). Organic farming research today and tomorrow. In IFOAM 2000 – The World Grows Organic. Proceedings of the 13th IFOAM Conference (Eds Alföldi, T., Lockeretz, W. & Niggli, U.), pp. 718–720. Basel: IFOAM.Google Scholar
Lockeretz, W. & Anderson, M. D. (1993). Agricultural Research Alternatives. Lincoln, NE, USA: University of Nebraska Press.Google Scholar
Lockeretz, W. & Boehncke, E. (2000). Agricultural systems research. In Diversity of Livestock Systems and Definition of Animal Welfare. Proceedings of the 2nd NAHWOA Workshop, pp. 5–12. Reading, UK: University of Reading. Available online at: http://www.veeru.reading.ac.uk/organic/proc/proceedings.htm (verified 23/7/07).Google Scholar
Lockeretz, W., Shearer, G. & Kohl, D. H. (1981). Organic farming in the corn belt. Science 211, 540–547.CrossRefGoogle ScholarPubMed
Lund, V. & Algers, B. (2003). Research on animal health and welfare in organic farming: a literature review. Livestock Production Science 80, 55–68.CrossRefGoogle Scholar
Lund, V., Coleman, G., Gunnarsson, S., Appleby, M. C. & Karkinen, K. (2006). Animal welfare science: working at the interface between the natural and social sciences. Applied Animal Behaviour Science 97, 37–49.CrossRefGoogle Scholar
Luukkonen, T. (1995). The impacts of research field evaluations on research practice. Research Policy 24, 349–365.CrossRefGoogle Scholar
Mäder, P., Fliessbach, A., Dubois, D., Gunst, L., Fried, P. & Niggli, U. (2002 a). Soil fertility and biodiversity in organic farming. Science 296, 1694–1697.CrossRefGoogle ScholarPubMed
Mäder, P., Fliessbach, A., Dubois, D., Gunst, L., Fried, P. & Niggli, U. (2002 b). The ins and outs of organic farming. Science 298, 1889–1890.Google Scholar
Mäder, P., Fliessbach, A., Dubois, D., Gunst, L., Fried, P. & Niggli, U. (2002 c). Organic farming and energy efficiency. Science 298, 1891.Google Scholar
MacGregor, N. & Hill, S. B. (2006). A journal whose time has come. Available online at http://www.organic-systems.org/journal/0601/pdf/macgregor-hill.pdf (verified 14/12/06).Google Scholar
Martini, E. A., Buyer, J. S., Bryant, D. C., Hartz, T. K. & Denison, R. F. (2004). Yield increases during the organic transition: improving soil quality or increasing experience? Field Crops Research 86, 255–266.CrossRefGoogle Scholar
Michelsen, J. (2001). Recent development and political acceptance of organic farming in Europe. Sociologica Ruralis 41, 3–20.CrossRefGoogle Scholar
Morgan, K. & Murdoch, J. (2000). Organic vs. conventional agriculture: knowledge, power and innovation in the food chain. Geoforum 31, 159–173.CrossRefGoogle Scholar
Mueller, T. & Thorup-Kristensen, K. (2001). N-fixation of selected green manure plants in an organic crop rotation. Biological Agriculture and Horticulture 18, 345–363.CrossRefGoogle Scholar
Nemecek, T. & Erzinger, S. (2005). Modelling representative life cycle inventories for Swiss arable crops. International Journal of Life Cycle Assessment 10, 68–76.CrossRefGoogle Scholar
Niggli, U. & Lockeretz, W. (1996). Development of research in organic agriculture. In Fundamentals of Organic Agriculture (Ed. Oestergaard, T. V.), pp. 9–23. Tholey–Tholey: IFOAMGoogle Scholar
National Research Council (1989). Alternative Agriculture. Washington, DC: National Academy Press.Google Scholar
Ogini, Y. O., Stonehouse, D. P. & Clark, E. A. (1999). Comparison of organic and conventional dairy farms in Ontario. American Journal of Alternative Agriculture 14, 122–128.CrossRefGoogle Scholar
Oldrup, H. & Just, F. (2000). Description and comparison of current implementation of sustainable agriculture in Europe: the case of Denmark. In Sustainable Agriculture in Europe: State of the Art and Policies in Five European Countries: Denmark, France Latvia, Netherlands, and Spain. European Research Project DGXII. Contract No. ENV 4-97-0443 and IC20 CT-97-0035 (Eds David, C., Bernard, C. & Just, F.), pp. 34–73. Available online at http://adm-websrv3a.sdu.dk/mas/Reports/MASReport1.pdf (verified 23/7/07).Google Scholar
Olesen, J. E. (1999). Perspectives for research on cropping systems. In Designing and Testing Crop Rotations for Organic Farming: Proceedings from an International Workshop (Eds Olesen, J. E., Eltun, R., Gooding, M. J., Jensen, E. S. & Köpke, U.), pp. 11–20. Denmark: DARCOF.Google Scholar
Olesen, J. E., Rasmussen, I. A., Askegaard, M. & Kristensen, K. (1999). Design of the Danish crop rotation experiment. In Designing and Testing Crop Rotations for Organic Farming: Proceedings from an International Workshop (Eds Olesen, J. E., Eltun, R., Gooding, M. J., Jensen, E. S. & Köpke, U.), pp. 49–62. Denmark: DARCOF.Google Scholar
Organic Farming Research Foundation (2006). Available online at http://ofrf.org/index.html (verified 23/7/07).Google Scholar
Padel, S. (2001). Conversion to organic farming: a typical example of the diffusion of an innovation? Sociologia Ruralis 41, 40–61.CrossRefGoogle Scholar
Padel, S., Tziliviakis, J., Measures, M., Stockdale, E. & Watson, C. (2002). Development of software to plan conversion to organic production. In Proceedings of the UK Organic Research 2002 Conference, Organic Research in Context, Aberystwyth, 2002 (Ed. Powell, J.), pp. 169–172. Aberystwyth, UK: Organic Centre Wales, Institute of Rural Studies, University of Wales.Google Scholar
Palmer, M., Stockdale, E., Shiel, R. & Gowing, J. (2006). Improved Knowledge Transfer for Better Soil Management. Report to the ARF 30th June 2006. London: Applied Research Forum.Google Scholar
Pfeiffer, E. (1975). Sensitive Crystallisation Processes: A Demonstration of Formative Forces in the Blood. New York: Anthroposophic Press.Google Scholar
Philipps, L., Welsh, J. P. & Wolfe, M. S. (1999). Ten years experience of all arable rotations. In Designing and Testing Crop Rotations for Organic Farming: Proceedings from an International Workshop (Eds Olesen, J. E., Eltun, R., Gooding, M. J., Jensen, E. S. & Köpke, U.), pp. 71–78. Denmark: DARCOF.Google Scholar
Phillips, S. L. & Wolfe, M. S. (2005). Evolutionary plant breeding for low input systems. Journal of Agricultural Science, Cambridge 143, 245–254.CrossRefGoogle Scholar
Quintern, M., Joergenesen, R. G. & Wildhagen, H. (2006). Permanent-soil monitoring sites for documentation of soil-fertility development after changing from conventional to organic farming. Journal of Plant Nutrition and Soil Science 169, 564–572.CrossRefGoogle Scholar
Ramirez-Tortosa, C., Anderson, Ø. M., Gardner, P. T., Morrice, P. C., Wood, S. G., Duthie, S. J., Collins, A. R. & Duthie, G. C. (2001). Anthocyanin-rich extract decreases indices of lipid peroxidation and DNA damage in vitamin E depleted rats. Free Radical Biology and Medicine 31, 1033–1037.CrossRefGoogle ScholarPubMed
Ramsden, P. (2003). Learning to Teach in Higher Education, 2nd edn.Oxon, UK: Routledge Falmer.CrossRefGoogle Scholar
Rasmussen, J., Langer, V. & Alroe, H. F. (2006). Bias in peer review of organic farming grant applications. Agriculture and Human Values 23, 181–188.CrossRefGoogle Scholar
Raupp, J., Pekrun, C., Oltmanns, M. & Köpke, U. (2006). Long Term Field Experiments in Organic Farming. ISOFAR Scientific Series 1. Berlin: Verlag Dr. Köster.Google Scholar
Reganold, J. P., Elliott, L. F. & Unger, Y. L. (1998). Long-term effects of organic and conventional farming on soil erosion. Nature 330, 370–372.CrossRefGoogle Scholar
Reganold, J. P., Glover, J. D., Andrews, P. K. & Hinman, H. R. (2001). Sustainability of three apple production systems. Nature 410, 926–929.CrossRefGoogle ScholarPubMed
Rigby, D. & Young, T. (2000). Why do Some Agricultural Producers Abandon Organic Production Systems? An Exploration of UK Data. University of Manchester Discussion Paper 0015. Manchester, UK: School of Economic Studies, University of Manchester.Google Scholar
Rigby, D., Young, T. & Burton, M. (2001). The development of and prospects for organic farming in the UK. Food Policy 26, 599–613.CrossRefGoogle Scholar
Roschewitz, I., Gabriel, D., Tscharntke, T. & Thies, C. (2005). The effects of landscape complexity on arable weed species diversity in organic and conventional farming. Journal of Applied Ecology 42, 873–882.CrossRefGoogle Scholar
Rosenfeld, P. L. (1992). The potential of transdisciplinary research for sustaining and extending linkages between the health and social sciences. Social Science and Medicine 35, 1343–1357.CrossRefGoogle Scholar
Rowe, J. S. (1997). From reductionism to holism in ecology and deep ecology. The Ecologist 27, 147–151.Google Scholar
Schmidt, H., Phillipps, L., Welsh, J. P. & Von Fragstein, P. (1999). Legume breaks in stockless organic farming rotations: nitrogen accumulation and influence on the following crops. Biological Agriculture and Horticulture 17, 159–170.CrossRefGoogle Scholar
Shearer, G., Kohl, D. H., Wanner, D., Kuepper, G., Sweeney, S. & Lockeretz, W. (1981). Crop production costs and returns on midwestern organic farms: 1977 and 1978. American Journal of Agricultural Economics 63, 264–269.CrossRefGoogle Scholar
Shepherd, M., Pearce, B., Cormack, L., Phillips, L., Cuttle, S., Bhogal, A., Costigan, P. & Unwin, R. (2003). An Assessment of the Environmental Impacts of Organic Farming: A Review for DEFRA-Funded Project OF0405. London: DEFRA. Available online at http://www.defra.gov.uk/science/Project_Data/DocumentLibrary/OF0405/OF0405_909_TRP.doc (verified 23/7/07).Google Scholar
Singh, O. V., Ghai, S., Paul, D. & Jain, R. K. (2006). Genetically modified crops: success, safety assessment, and public concern. Applied Microbiology and Biotechnology 71, 598–607.CrossRefGoogle ScholarPubMed
Spedding, C. R. W. (1975). An Introduction to Agricultural Systems. London: Elsevier Applied Science.Google Scholar
Squire, G. & Gibson, G. J. (1997). Scaling up and down: matching research with requirements in land management and policy. In Scaling Up: From Cell to Landscape (Eds van Gardingen, P., Food, G. & Curran, P.), pp. 17–34. Cambridge: Cambridge University Press.Google Scholar
Stopes, C., Lord, E. I., Philipps, L. & Woodward, L. (2002). Nitrate leaching from organic farms and conventional farms following best practice. Soil Use and Management 18, 256–263.CrossRefGoogle Scholar
Sykes, F. (1947). Humus and the Farmer. London: Faber and Faber Ltd.Google Scholar
Taylor, D., Younie, D., Coutts, M., Matheson, S. & Mayer, C. (2002). Experiences with designing and managing organic rotations trials. Proceedings of the UK Organic Research 2002 Conference: Organic Research in Context, pp. 37–42. Aberystwyth, UK: Organic Centre Wales.Google Scholar
Taylor, B. R., Younie, D., Matheson, S., Coutts, M., Mayer, C., Watson, C. A. & Walker, R. L. (2006). Output and sustainability of organic ley/arable crop rotations at two sites in Northern Scotland. Journal of Agricultural Science, Cambridge 144, 435–447.CrossRefGoogle Scholar
Thompson, P. B. (1995). The Spirit of the Soil. Agriculture and Environmental Ethics. New York: Routledge.Google Scholar
Tinker, P. B. (2000). Shades of Green: a Review of UK Farming Systems. Warwickshire, UK: Royal Agricultural Society of England.Google Scholar
Trewavas, A. J. (2001). Urban myths of organic farming. Nature 410, 409–410.CrossRefGoogle ScholarPubMed
Trewavas, A. (2004). A critical assessment of organic farming-and-food assertions with particular respect to the UK and the potential environmental benefits of no-till agriculture. Crop Protection 23, 757–781.CrossRefGoogle Scholar
Van Bueren, E. T. L., Struik, P. C. & Jacobsen, E. (2003). Ecological concepts in organic farming and their consequences for an organic crop ideotype. Netherlands Journal of Agricultural Science 50, 1–26.Google Scholar
Van Der Ploeg, R. R., Bohm, W. & Kirkham, M. B. (1999). On the origin of the theory of mineral nutrition of plants and the law of the minimum. Soil Science Society of America Journal 63, 1055–1062.CrossRefGoogle Scholar
Van Mansfeld, J. D. & Amons, E. (1975). Inquiry into the limits of biological effects of chemical compounds in tissue culture. I. Low dose effects of mercuric oxide. Zeitschrift fur Naturforschung 30, 643–649.CrossRefGoogle Scholar
Watson, C. A. & Atkinson, D. (2002). Organic Farming – the appliance of science. In Proceedings of the UK Organic Research 2002 Conference: Organic Research in Context, pp. 13–17. Aberystwyth, UK: Organic Centre Wales.Google Scholar
Watson, C. A., Fowler, S. M. & Wilman, D. (1993). Soil inorganic-N and nitrate leaching on organic farms. Journal of Agricultural Science, Cambridge 120, 361–369.CrossRefGoogle Scholar
Watson, C. A., Younie, D. & Armstrong, G. (1999). Designing crop rotations for organic farming: importance of the ley-arable balance. In Designing and Testing Crop Rotations for Organic Farming: Proceedings from an International Workshop (Eds Olesen, J. E., Eltun, R., Gooding, M. J., Jensen, E. S. & Köpke, U.), pp. 91–98. Denmark: DARCOF.Google Scholar
Watson, C. A., Bengtsson, H., Ebbesvik, M., Løes, A-K., Myrbeck, A., Salomon, E., Schroder, J. & Stockdale, E. A. (2002). A review of farm-scale nutrient budgets for organic farms as a tool for management of soil fertility. Soil Use and Management 18, 264–273.CrossRefGoogle Scholar
Watson, C. A., Kristensen, E. S. & Alroe, H. F. (2006). Research to support the development of organic food and farming. In Organic Agriculture: A Global Perspective (Eds Kristiansen, P., Taji, A. & Reganold, J.), pp. 361–383. Collingwood, Australia: CSIRO Publishing.CrossRefGoogle Scholar
Weller, R. & Jackson, A. (2006). Organic Dairy Farming. Aberystwyth: Organic Centre Wales.Google Scholar
Wildhagen, H. & Brandt, M. (2003). Boden-Dauerbeobachtungsflächen zur Feststellung von Bodenveränderungen nach der Umstellung. In Contributions to the 7th Research Conference on Organic Agriculture: Organic Agriculture of the Future, pp. 101–104. Vienna, Austria: Universität für Bodenkultur Wien – Institut für ökologischen Landbau. Available online at http://www.wiz.uni-kassel.de/bok/documents/pdfDateienc/Boden_Dauerbeob.pdf (verified 24/7/07).Google Scholar
Willer, H. & Yussefi, M. (2006). The World of Organic Agriculture 2006. Statistics and Emerging Trends. IFOAM Publication, 8th, revised edition. Bonn, Germany: IFOAM & FiBL.Google Scholar
Williams, A. G., Audsley, E. & Sandars, D. L. (2006). Energy and environmental burdens of organic and non-organic agriculture and horticulture. Aspects of Applied Biology 79, 19–23.Google Scholar
Williams, C. M. (2002). Nutritional quality of organic food: shades of grey or shades of green? Proceedings of the Nutritional Society 61, 19–24.CrossRefGoogle ScholarPubMed
Woodward, L. (2002). The scientific basis of organic farming. Interdisciplinary Science Reviews 27, 114–119.CrossRefGoogle Scholar
Wynen, E. (1997). Research on biological farming methods in Europe: perspectives, status and requirements. In Biological Farming Research in Europe (Ed. Krell, R.), pp. 6–49. REU Technical Series 54. Rome: FAO.Google Scholar