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Plant Nutrients in Organic Farming

  • Keith Goulding
  • Elizabeth Stockdale
  • Christine Watson

Abstract

Effective nutrient management is essential in organic farming systems. Processed soluble fertilisers such as ammonium nitrate, which feed the plant directly and are thought to bypass the natural processes of the soil, are not generally acceptable. Nutrient supply to crop plants is supported through recycling, the management of biologically-related processes such as nitrogen fixation by clover and other legumes, and the limited use of unrefined, slowly-soluble off-farm materials that decompose in the same way as soil minerals or organic matter. The aim is to achieve as far as possible a closed nutrient cycle on the farm and to minimise adverse environmental impact. Effective management of any ‘waste’ materials such as manures and crop residues is a key to nutrient cycling on organic farms. However, not all organic farms have easy access to manures and recycling is limited by the prohibition of the use of sewage sludge because of current concerns over the introduction of potentially toxic elements, organic pollutants and disease transmission. In addition, the current global market, in which food is transported large distances from the farm, results in a significant export of nutrients. Exported nutrients must be replaced to avoid nutrient depletion of soils. Nutrient budgeting suggests some cause for concern over the sustainability of organic systems because of their dependence on feedstuffs and bedding for inputs of phosphorus (P) and potassium (K), and on the very variable fixation by legumes or imports of manure or compost for nitrogen (N); air pollution and net mineralisation from soil reserves appear to comprise a large part of the N supply on some organic farms. Losses of N from organic systems can also be as large as those from conventional systems and, being dependent on cultivation and the weather, they are even more difficult to control than those from fertilisers applied to conventional farms. There is some evidence of P deficiency in soils under organic production, and replacing K sold off the farm in produce is especially difficult. Organic farming systems may be sustainable and have the potential to deliver significant environmental benefits, but these depend on specific cropping and management practices on each farm. It is important that we study and improve nutrient management on all farm systems and in the context of plant, animal and human health in order to develop more sustainable farming systems.

Keywords

Organic farming Plant nutrients Nitrogen (N) Potassium (K) Phosphorus (P) Nutrient budgets Nutrient management Soils 

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References

  1. Berry, P.M., Stockdale, E.A., Sylvester-Bradley, R., Philipps, L., Smith, K.A., Lord, E.I., Watson, C.A., and Fortune, S., 2002, N, P and K budgets for crop rotations on nine organic farms in the UK, Soil Use Manage. 18: 248–255.CrossRefGoogle Scholar
  2. Cooke, G.W., 1967, The Control of Soil Fertility, Crosby-Lockwood, London, 526p.Google Scholar
  3. Cormack, W.F., 1999, Testing a stockless arable organic rotation on a fertile soil, in: Designing and Testing Crop Rotations for Organic Farming, J.E. Olesen, R. Eltun, M.J. Gooding, E.S. Jensen, and U. Kopke, eds., DARCOF, Denmark, pp. 115–124.Google Scholar
  4. Fortune, S., Hollies, J., and Stockdale, E.A, 2004, Effect of different potassium fertilizers suitable for organic farming systems on grass/clover yields and nutrient offtakes and interactions with nitrogen supply, Soil Use Manage. 20: 403–409.CrossRefGoogle Scholar
  5. Fowler, S.M., Watson, C.A., and Wilman, D., 1993, N, P and K on organic farms: herbage and cereal production, purchases and sales, J. Agric. Sci. (Camb.) 120: 353–360.Google Scholar
  6. Gerritse, R.G., and Vriesema, R., 1984, Phosphate distribution in animal waste slurries, J. Agric. Sci. (Camb.) 102: 159–161.Google Scholar
  7. Goss, M.J., and Goorahoo, D., 1995, Nitrate contamination of groundwater: measurement and prediction, Fertil. Res. 42: 331–338.CrossRefGoogle Scholar
  8. Goulding, K.W.T., Stockdale, E.A., Fortune, S., and Watson, C., 2000, Nutrient cycling on organic forms, J. R. Agric. Soc. Eng. 161: 65–75.Google Scholar
  9. Halberg, N., Kristensen, E.S., and Kristensen, I.S., 1995, Nitrogen turnover on organic and conventional mixed farms, J. Agric. Environ. Ethic. 8: 30–51.CrossRefGoogle Scholar
  10. Haraldsen, T.K., Asdal, A., Grasdalen, C., Nesheim, L., and Ugland, T.N., 2000, Nutrient balances and yields during conversion from conventional to organic cropping systems on silt loam and clay soils in Norway, Biol. Agric. Hortic. 17: 229–246.Google Scholar
  11. Høgh-Jensen, H., Loges, R., Jørgensen, F.V., Vinther, F.P., and Jensen, E.S., 2004, An empirical model for quantification of symbiotic nitrogen fixation in grass-clover mixtures, Agric. Syst. 82: 181–194.CrossRefGoogle Scholar
  12. Howard, A., 1943, An Agricultural Testament, Oxford University Press, Oxford.Google Scholar
  13. IFOAM (International Federation of Organic Agriculture Movements), 1998, IFOAM Basic Standards for Production and Processing, IFOAM Publications, Germany.Google Scholar
  14. IFOAM (International Federation of Organic Agriculture Movements), 2006, http://www.ifoam.org/about_ifoam/principles/. Assessed October 2006.
  15. Johnston, A.E., 1991, Potential changes in soil fertility form arable farming systems including organic systems, Proc. Fertil. Soc. Lond. 306: 38.Google Scholar
  16. Johnston, A.E., Goulding, K.W.T., Poulton, P.R., and Chalmers, A.G., 2001, Reducing fertiliser inputs: endangering arable soil fertility? Proc. Int. Fertil. Soc. 487: 44.Google Scholar
  17. Leach, K.A., Allingham, K.D., Conway, J.S., Goulding, K.W.T., and Hatch, D.J., 2005, Nitrogen management for profitable farming with minimal environmental impact: the challenge for mixed farms in the Cotswold Hills, England, Int. J. Agric. Sust. 2: 21–32.Google Scholar
  18. Ledgard, S.F., and Steele, K.W., 1992, Biological nitrogen fixation in mixed legume/grass pastures, Plant Soil 141: 137–153.CrossRefGoogle Scholar
  19. Lockeretz, W., and Anderson, M.D., 1993, Agricultural Research Alternatives, University of Nebraska Press, Lincoln.Google Scholar
  20. Lord, E., Stopes, C., and Philipps, L., 1997, Assessment of Relative Nitrate Losses from Organic and Conventional Farming Systems, based on Recent Measurements. Final Report to MAFF, Contract OFO 141, ADAS, Wolverhampton, UK.Google Scholar
  21. Mäder, P., Fliessbach, A., Dubois, D., Gunst, L., Fried, P., and Niggli, U., 2002, Soil fertility and biodiversity in organic farming, Science 296: 1694–1697.PubMedCrossRefGoogle Scholar
  22. MAFF (Ministry of Agriculture, Fisheries and Food), 1999, Review of the Organic Aid Scheme, MAFF, London, UK.Google Scholar
  23. Nolte, C., and Werner, W., 1994, Investigations on the nutrient cycle and its components of a biodynamically-managed farm, Biol. Agric. Hortic. 10: 235–254.Google Scholar
  24. Olesen, J.E., Rasmussen, I.A., Askegaard, M., and Kristensen, K., 1999, Design of the Danish crop rotation experiment, in: Designing and Testing Crop Rotations for Organic Farming, J.E. Olesen, R. Eltun, M.J. Gooding, E.S. Jensen, and U. Kopke, eds., DARCOF, Denmark, pp. 49–62.Google Scholar
  25. Paxton, A., 1994, The Food Miles Report: The Dangers of Long Distance Food Transport, SAFE Alliance, London, UK.Google Scholar
  26. Peperzak, P., Caldwell, A.G., Hunziker, R.R., and Black, C.A., 1959, Phosphorus fractions in manures, Soil Sci. 87: 293–302.CrossRefGoogle Scholar
  27. Philipps, L., and Stopes, C.E., 1995, Organic rotations and nitrate leaching in the UK, Biol. Agric. Hortic. 11: 123–134.Google Scholar
  28. Rajan, S.S.S., Watkinson, J.H., and Sinclair, A.G., 1996, Phosphate rocks for dirt application to soils, Adv. Agron. 57: 77–159.CrossRefGoogle Scholar
  29. RASE (Royal Agricultural Society of England), 2000, Shades of Green. A Review of UK Farming Systems, RASE, Stoneleigh, UK.Google Scholar
  30. Rowe, J.S., 1997, From reductionism to holism in ecology and deep ecology, Ecology 27: 147–151.Google Scholar
  31. Sato, S., Solomon, D., Hyland, C., Ketterings, Q.M., and Lehmann, J., 2005, Phosphorus speciation in manure and manure amended soils using XANES spectroscopy, Environ. Sci. Technol. 39: 7485–7491.PubMedCrossRefGoogle Scholar
  32. Scoones, I., and Toulmin, C., 1998, Soil nutrient balances: what use for policy? Agric. Ecosyst. Environ. 71: 255–267.CrossRefGoogle Scholar
  33. Silgram, M., and Shepherd, M.A., 1999, The effect of cultivation on soil nitrogen mineralisation, Adv. Agron. 65: 267–311.CrossRefGoogle Scholar
  34. Soil Association, 2004, Organic Food and Farming Report 2004, Soil Association, Bristol, UK.Google Scholar
  35. Soil Use and Management, 2002, Soil Fertility in Organically Managed Soils, Vol. 18(Suppl.), pp. 238–308.Google Scholar
  36. Stockdale, E.A., Shepherd, M.A., Fortune, S., and Cuttle, S.P., 2002, Soil fertility in organic farming systems – fundamentally different? Soil Use Manage. 18: 301–308.CrossRefGoogle Scholar
  37. Topp, C.F.E., Watson, C.A., Rees, R.M., and Sanders, I., 2005, The Prediction of Biological Nitrogen Fixation. XX International Grassland Conference: Offered Papers, Proceedings of the IGC, Dublin, Wageningen Academic Publishers, The Netherlands, 877p.Google Scholar
  38. UKROFS, 1999, Standards for Organic Food Production, United Kingdom Register of Organic Food Standard, London, UK.Google Scholar
  39. Watson, C.A., and Younie, D., 1995, Nitrogen balances in organically and conventionally managed beef production systems, in: Grassland into the 21st Century: Challenges and Opportunities, G.E Pollott, ed., Proc. Br. Grass. Soc. 1665: 197–199.Google Scholar
  40. Watson, C.A., Fowler, S.M., and Wilman, D., 1993, Soil inorganic-N and nitrate leaching on organic farms, J. Agric. Sci. (Camb.) 120: 361–169.CrossRefGoogle Scholar
  41. Watson, C.A., and Atkinson, D., 1999, Using nitrogen budgets to indicate nitrogen use efficiency and losses from whole farm systems: a comparison of three methodological approaches, Nutr. Cycl. Agroecosyst. 53: 259–267.CrossRefGoogle Scholar
  42. Watson, C.A., Younie, D., and Armstrong, G., 1999, Designing crop rotations for organic farming: importance of the ley-arable balance, in: Designing and Testing Crop Rotations for Organic Farming, J.E. Olesen, R. Eltun, M.J Gooding, E.S. Jensen, and U. Kopke, eds., DARCOF, Denmark, pp. 91–98.Google Scholar
  43. Watson, C.A., Bengtsson, H., Løes, A-K., Myrbeck, A., Salomon, E., Schroder, J., and Stockdale, E.A., 2002, A review of farm-scale nutrient budgets for organic farms in temperate regions, Soil Use Manage. 18: 264–273.CrossRefGoogle Scholar
  44. Willer, H., and Yussefi, M., 2005, The World of Organic Agriculture. Statistics and Emerging Trends 2005, IFOAM, Bonn, Germany.Google Scholar
  45. Woodward, L., 2002, Science and Research in Organic Farming, EFRC Pamphlet series, Policy and Research Department, Elm Farm Research Centre, UK.Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Keith Goulding
    • 1
  • Elizabeth Stockdale
  • Christine Watson
  1. 1.Cross-Institute Programme for Sustainable Soil Function Rothamsted Research HarpendenHertfordshireUK

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