## Elements of soil physics by P. Koorevaar

By P. Koorevaar

Hardbound.

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B. 0 x lo5 m2 kg- equals 80 ha kg - l . c. The volume of one clay particle is x 20 x x 20 x m3 = 4 x m3. 1 x kg. 30 a. 05 a 20nm b. 9b yielded s = 8 x los m2 kg-'. This equation involves no approximation. Equation 1 . 3 x lo5 m2 kg-I 2750 x Thus, for these plate-shaped particles, Equation 1 . 9 introduces ~ about 9% error. 9c, is s2 = Ps6' 31 26/a Thus, the percent error in s, is s1 - s 2 x 100% =x 100%. 49 x 106m2kg-'. '=2750 x 2 Equation 1 . 73 x 106m2kg-'. 46 x 106m2kg-'. 9d gives s = 2750 x Equation 1 .

36 2 Equilibrium in force fields and theory of potentials In Chapter 1 it was mentioned that several forces act on soil water due to the nature of the solid particles. Because these forces operate simultaneously and have different magnitudes and directions, it is necessary to know how to add and multiply vectors in order to describe and predict water transport in soils. As in mechanics, the forces acting in soils obey the laws of vector operation. In this chapter we shall first discuss the basic vector operations and the associated conditions for equilibrium.

Wiley, 489 p. Chapters I and 5. BEERS,W. F. J. VAN, 1980. Soils and Soil Properties. Chapter 1 in: Drainage Principles and Applications. Publication 16, Vol. I , Int. Inst. for Land Reclamation and Improvement (ILRI), Wageningen, The Netherlands, 2nd edition. BOLT, G. H. and M. G. M. BRUGCENWERT (eds), 1978. Soil Chemistry A. Basic Elements. Elsevier Scientific Publishing Co. 281 p. Chapters I and 3. , 1980. Fundamentals of Soil Physics. Academic Press, 413 p. Chapters 2,4,5 and 6. MARSHALL, T.