This second edition retains all of the topics covered in the first edition. Each chapter
has been revised, to take account of new developments. The two separate contributions
relating to penetrometer measurements have been combined into one
chapter, and others have been somewhat shortened, in order to include new material
on the measurement of infiltration, the measurement of soil strength and friability,
and field methods of assessment of soil physical conditions. The chapter on
gas movement and air-filled porosity now covers soil–atmosphere exchange of
environmentally important gases, including radon and greenhouse gases.