References

Al-Bakri, K.H. (1984) Biological Influences on the Development of Soil Structure . Ph.D. Thesis, University College of Wales, Aberystwyth.

Casagrande, A. and Fadum, R.E. (1940) Notes on Soil Testing for Engineering Purposes, Harvard Univ. Grad. School of Engineering, Publ. 268, quoted, p55, in Soil Mechanics in Engineering Practice by Karl Terzaghi and Ralph B. Beck, 2nd edn, Wiley, New York, 1967.

Drew, M.C. (1975) Comparison of the effects of a localised supply of phosphate, nitrate, ammonium and potassium on the growth of the seminal root system, and the shoot, in barley. New Phytologist 75, 479–490.

Houghoudt, S.B. (1940) Versl. Landbouwk, Ond., 46, pp. 515–707, reviewed in English by Luthin, J.N., Drainage Engineering, Wiley, 1966, pp. 149–158.

Kamenskii, G.N. (1938) Dvizhenie gruntovykh vod v mezhdurechnom massive. (The movement of ground water in interfluvial tracks) quoted in Aravin, V.I. and Numerov, S.N. (1953) Theory of Fluid Flow in Undeformable Porous Media. Translated from Russian, Israel Program for Scientific Translations, Jerusalem, 1965, p. 85.

MAFF (1976) The Agricultural Climate of England and Wales , HMSO, London

MAFF (1982) The Design of Field Drainage Pipe Systems , HMSO, London

Salih, R.O. (1978) The Assessment of Soil Structure and the Influence of Soil Treatment on This Property. Ph.D. Thesis, University College of Wales, Aberystwyth.

Stewart, V.I. (1971) Drainage Problems on Playing Fields, National Playing Fields Association, London.

Stewart, V.I. (1985) Functions of the soil. Introductory paper for European Environmental Bureau Conference on Soil Protection in the European Community, Brussels, 1984, pp. 47–58. Reproduced in The Royal New Zealand Institute of Horticulture Annual Journal , (13) 1985, 45–48.

Stewart, V.I. and Adams, W.A. (1969) Soil factors affecting the control of pace on cricket pitches, in Proceedings of First International Turfgrass Research Conference , Harrogate, England, pp. 533–546

Stewart, V.I. and Salih, R.O. (1981) Priorities for soil use in temperate climates, in Biological Husbandry (ed. B. Stonehouse) Butterworths, London, pp. 19–37.

Stewart, V.I., Salih, R.O., Al-Bakri, K.H. and Strong, J. (1980) Earthworms and Soil Structure, Report No. 21, Welsh Soils Discussion Group, pp. 103–114.

Stewart, V.I. and Scullion, J. (1989) Principles of managing man-made soils. Soils andManagement , 5, 109–116.

Stewart. V.I., Scullion J., Salih, R.O. and Al-Bakri, K.H. (1988) Earthworms and structure rehabilitation in subsoils and topsoils affected by opencast mining for coal. Biological Agriculture and Horticulture, 5, 325–338.

Thornton, D.J. (1978) The Construction and Drainage of some Specified Sports Field Playing Surfaces. Ph.D. Thesis, University College of Wales, Aberystwyth.

Vaughan, D, Wheatley, R.E. and Ord, B.G. (1984) Removal of ferrous iron from field drainage waters by conifer bark. Journal of Soil Science , 35, 149–153.

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