Volume 73 contains 4 reviews on contemporary and important topics in the agronomic sciences. In Chapter 1, "Interactions among Root-Inhabiting Fungi and Their Implications for Biological Control of Root Pathogens, " fungi are defined, their distribution and abundance are discussed, and their role in agroecosystems is present. Chapter 2, "Dwarfing Genes in Plant Improvement, " discusses advances in the role of dwarfing genes in plant improvement. Emphasis is placed on breeding and genetic aspects. Chapter 3, "A Review of the Effect of N Fertilizer Type on Gaseous Emissions, " covers a topic that is of great environmental interest – the effect of nitrogen fertilizers on gaseous emissions. Chapter 4, "Rhizobia in the Field, " is a comprehensive review of rhizobia including diversity, systematics, natural populations, and field introduction of rhizobia.
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