tailieunhanh - Organic food and farming myth and reality

After some further kilometres, sodium begins to increase by ion exchange at the expense of calcium, producing a natural softening of the water. Eventually, the available calcium in the water is exhausted, but sodium continues to increase to a level greater than could be achieved purely by cation exchange. As chloride also begins to increase, this marks the point at which recharging water moving slowly down through the aquifer mixes with much older saline water present in the sediments (Figure ). The observed hydrochemical changes can thus be interpreted in terms of oxidation/reduction, ion exchange and mixing processes. . | Organic food and farming r I _andi _ reality Organic vs non-organic the facts - al better food am 2 Acknowledgements The research and publication of this report was made possible by the financial support of the JMG Foundation and the Soil Association. The project was co-ordinated and researched by Catherine Fookes with assistance from Kath Dalmeny. The following people and organisations gave advice information and support for which we are extremely grateful The organisations listed below are very pleased to support the publication of this report. They believe it will make a valuable contribution to the debate on organic food and farming. Each of the organisations may be indicating its formal agreement only in those areas where it has specific competence. Andersen Jens Otto Kyrikiades Alec Association of Unpasteurised Milk Producers and Consumers Alexander Ian Lang Tim Biodynamic Agricultural Association Altieri Miguel Leifert Carlo British Dietetics Association Anderson Luke Lobstein Tim Butterfly Conservation Barling David Long Adrian Common Ground Barry Dick Longfield Jeanette Commonwork Land Trust Bell Sandra McLaughlin Alan Compassion in World Farming Benbrook Charles Meadows Donella East Anglia Food Links Blake Francis Meziani Gundula Ecological Foundation Brenman Simon Moore Tony Ecologist Bristol Cancer Help Centre Nash Steve Elm Farm Research Centre Brown Lynda Niggli Urs Family Farmers Association Buffin David Padel Susanne Farmer s Link Burton Michele Molgaard Jens Peter Federation of City Farms and Community Gardens Burton Kathie Parr Doug Food Labelling Agenda FLAG Charman Karen Prakash . Food Additives Campaign Team Clancy Kate Pretty Jules Food Commission Clisby Rory Rembialkowska Ewa Foundation for Local Food Initiatives Cox Janice Riley Pete Friends of the Earth Cummins Ronnie Ritchie Mark Gaia Foundation Devereux Clare Rosset Peter Green Network Dowding Oliver Rowell Andy Health Education Trust Ervin David Sault Nicole Henry Doubleday Research .