This latest volume contains five reviews covering key contemporary topics in agronomy. As always, the topics covered are varied and exemplary of the panoply of subject matter dealt with by this long-running serial. "Advances in Agronomy" continues to be recognized as a leading reference and a first-rate source of the latest and best research in agronomy. It covers: the Rhizosphere and its management to improve plant growth; advances in the understanding of Aluminum Toxicity and the development of Aluminum-Tolerant transgenic plants; mobile subsurface colloids and their role in contaminant transport; transfer of phosphorus from agricultural soils; and, applications of molecular biology to plant disease and insect resistance.