This series of critical reviews, Advances in Soil Science, fills a gap between the primary scientific journal and the comprehensive reference monograph. The reviews of timely topics provide in-depth analyses and practical applications for the practitioner. The series was formulated to be international in authorship and application of all subjects relating to soil science and is increasingly being cited by soil scientists. Volume 12 contains contributions on subjects including soil structure, Azospirillum inoculation, clay mineralogy analyses, and evaporation from soil.