Volcanic ash soils genesis properties and utilization authors s shoji m nanzyo ra dahlgren publisher elsevier 1994 isbn 0080869890 9780080869896 length 287 pages subjects. Volcanic ash soils genesis properties and utilization shoji sadao isbn 9780444548252 kostenloser versand fur alle bucher mit versand und verkauf duch amazon. Volcanic eruptions are generally viewed as agents of destruction yet they provide the parent materials from which some of the most productive soils in the world are formed the high productivity results from a combination of unique physical chemical and mineralogical properties the importance and uniqueness of volcanic ash soils are exemplified by the recent establishment of the andisol . Part 7 physical characteristics of volcanic ash soils soil colour soil texture soil structure soil consistence bulk density and porosity water retention and plant available water water permeability irreversible changes in soil physical properties with drying