Maize is the most thoroughly researched of all the cereals, and the one in which the greatest productivity advances have been achieved. Plant breeding advances have been complemented by similar advances in soil chemistry and physics, plant physiology, plant pathology, entomology, cytogenetics, biometrics, and molecular biology. These various research findings and products have been synthesized into new, higher yielding technologies that have been extended to farmers in many maize-growing areas. The result has been a succession of productivity-enhancing maize technologies that have propelled maize to its current position as the cereal with the world’s highest average yield.