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The adoption of no tillage (NT) in crop production has been encouraged primarily due to its more significant benefits to the environment compared with other conservation tillage systems. There are nevertheless concerns about NT corn (Zea mays L.) performance from both short- and long-term perspectives. This study was conducted near Burlington, Nashua, Newell, Sutherland, and Crawfordsville in Iowa from 1978 through 2001 to evaluate corn production in 4- to 5-year phases under long-term NT management. Field experiments were conducted using a complete randomized block, or split-plot design. Seven tillage systems including NT, moldboard plow (MP), ridge tillage (RT), chisel plow (CP), reduced tillage (RDT), field cultivation (FC), and tillage-plant (TP) were evaluated in terms of corn yield and economic return. Differences between NT and other tillage systems in either corn yield or economic return did …