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When the revision of this work was started, Dr. Pan Ming Huang, who was the associate editor for the soil chemistry part in the rst edition, took on the role of editor in chief. Tragically and unexpectedly, he passed away in September 2009 in the midst of overseeing this expansive work. At short notice, the publisher approached us to complete this massive task to which we agreed in November 2009. Posthumously, we wish to recognize the vision, hard work, and dedication of our friend and colleague, Dr. Huang, in developing the revised outline of the book and soliciting the participation of all the associate editors and, in turn, the authors.