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This article in AJ

  1. Vol. 79 No. 3, p. 582-587
    Received: July 15, 1986

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Tillage Systems for Wheat Production in the Southeastern Coastal Plains1

  1. D. L. Karlen and
  2. D. T. Gooden2



Increased wheat (Triticum aestivum L.) production has raised numerous questions regarding tillage practices and N fertilizer rates for the Coastal Plain. Therefore, eight field studies conducted on Ardilla (Fragiaquic Paleudults), Dothan (Plinthic Paleudults), and Norfolk (Typic Paleudults) soils are summarized to report N fertilizer and tillage effects. Average grain yield with moldboard plowing was significantly higher (0.4 Mg ha−1) than with disking in four of five studies, but it was significantly higher than chisel plowing (3.09 vs. 2.48 Mg ha−1) only once. No-till yield was significantly lower (0.5 Mg ha −1) than yield with disking in two of four studies. Nitrogen response was significant in five of six studies, but the tillage ✕ N interaction was significant only once. Head number and weight were increased by plowing or higher N rates. Poor soil-seed contact presumably caused erratic stands and lower no-till yields because seedling emergence was not reduced by the equivalent of 10 Mg ha−1 of corn (Zea mays L.) residue. Approximately 100 kg N ha−1 was sufficient for conventional tillage, but chisel or moldboard plowing should be used rather than disking. For no-till wheat, drills must provide good soil-seed contact and N rates may have to be increased.

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