Soil, agriculture, and other scientists look in detail at interactions of soil properties and processes with plant root growth and function in order to make the most efficient use of soil, water, and nutrient resources. Among the topics are quantifying soil-root interactions, nitrogen management effects of root systems, characterizing root length density distribution in wheat using a generalized function, modeling Lolium perenne L. (ryegrass) roots in the presence of empirical black holes, simulating root development and soil resource acquisition in dynamic models of crop-weed competition, and modeling resource interactions under multiple edaphic stresses. The 13 papers were selected from a symposium at the 2009 international annual meetings of the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America Annotation ©2013 Book News, Inc., Portland, OR (booknews.com)