Acknowledgements

First, I would like to express my gratitude to the teachers, lecturers and industrial scientists who have instilled a high regard for practical analytical chemistry, with the need for care, accuracy, and the development of a skilful and safe technique.

There are a number of individuals who have been most helpful in my search for information. It is difficult to remember everyone I have consulted over a period of 18 months, and my sincere apologies for any omissions. They include the following, with the area of advice in parentheses:

Professor W.A. Adams (soil science), University of Wales, Aberystwyth, UK F.M. Balzer (analysis for organic farming), Labor Dr F.M. Balzer, Wetter, Germany Zoltan Bodor (fertilizer analysis), Kemira, Finland

Joao Coutinho (soil sulphate analysis), Universidade de Tras-os Montes e Alto

Douro (UTAD), Portugal Steve Cuttle (soil analysis for organic farming), Institute for Grassland and

Environmental Research, Aberystwyth, UK Sue Fowler (organic farming), Institute of Rural Studies, University of Wales, Aberystwyth, UK

Professor D.I. Givens (NIR), ADAS Nutritional Sciences Research Unit,

Stratford-upon-Avon, UK John Hollies (soil analysis), The Potash Development Association, Laugharne,

Carmarthen, UK D. Iorwerth Jones (cellulase digestibility)

Sue Lister (NIR), Institute for Grassland and Environmental Research, Aberystwyth

Bob Llewelyn (organic manure analysis; ADAS analytical methods), ADAS

Laboratories, Wolverhampton, UK Peter J. Loveland (ADAS and BCSR soil analysis approaches), Silsoe Campus,

Cranfield University, UK Ramadan Al-Mabruk (animal nutrition) Institute of Rural Studies, University of Wales, Aberystwyth, UK Isabel McMann (references), Bodleian Library, Oxford, UK Tim Meeks (information), Tennessee Valley Authority

Meriel Moore-Colyer (equine nutrition), Institute of Rural Studies, University of Wales, Aberystwyth, UK Cornelia Moser (reference), Landwirtschaftlicher Informationsdienst (LID), Bern, Switzerland

Suzanne Padel (organic farming), Institute of Rural Studies, University of

Wales, Aberystwyth, UK Dan Powell (organic farming), Aberystwyth, UK

David Rowell (soil analysis), Department of Soil Science, University of Reading, UK

Mustapha Bello Salawu (digestibility spreadsheets; silage VFA analysis), Institute of Rural Studies, University of Wales, Aberystwyth; now at Commonwork Group Ltd, Kent, UK Steve Smith (reference), Stapledon Library, Institute for Grassland and

Environmental Research, Aberystwyth, UK Stuart Smith (autoanalysis methodology), Divisional Manager, BL-Analytics,

Bran+Luebbe, UK Rebecca Stubbs (editorial support), CABI Publishing, Wallingford, UK Claudine Tayot (reference), OPOCE online helpdesk Paul Thomas (NSP methodology), Institute for Grassland and Environmental

Research, Aberystwyth, UK Ann Vaughan (lab techniques), Institute of Rural Studies, University of Wales, Aberystwyth, UK

Joanne Vessey (fertilizer analysis), Hydro Agri (UK) Limited, Immingham Dock, UK

Keith Way (NCGD method), Laboratory Consultant

Gabriele Weigmann-Dramé (reference), VDLUFA-Verlag, Darmstadt, Germany

Lorraine Whyberd (information), Royal Society of Chemistry, London, UK David Wilman (Fig. 1.5; agronomy), Institute of Rural Studies, University of Wales, Aberystwyth, UK

I appreciate the efforts of the staff of the Huw Owen and Thomas Parry Libraries, University of Wales, Aberystwyth, for retrieving large old tomes from the store in an attempt to trace the origins of some methods. I am also grateful to the university for permission to use the facilities of the Information Services subsequent to taking early 'retirement'.

I would like to thank ADAS, Wolverhampton, for permission to reproduce the information in Appendix 7; Bran+Luebbe, for permission to reproduce the methods in Appendices 5 and 6; and the Controller of Her Majesty's

Stationery Office for a licence to reproduce material from the MAFF/ADAS publications: The Analysis of Agricultural Materials Reference Book 427, and Fertiliser Recommendations Reference book 209 5th and 6th edns.

Finally, many thanks to my wife Eileen, for her continuous support, patience and encouragement throughout this task.

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