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This article in AJ

  1. Vol. 79 No. 3, p. 477-481
     
    Received: Mar 17, 1986


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doi:10.2134/agronj1987.00021962007900030014x

Growth and Productivity of Four Corn Hybrids as Affected by Tillage1

  1. T. C. Kaspar,
  2. T. M. Crosbie,
  3. R. M. Cruse,
  4. D. C. Erbach,
  5. D. R. Timmons and
  6. K. N. Potter2

Abstract

Abstract

Conservation-tillage systems produce different soil environments for corn (Zea mays L.) growth and development than do intensive tillage systems. Development of corn hybrids specifically adapted to conservation-tillage environments may be one way to increase and stabilize grain yield. A 2-yr field study on a Typic Haplaquolls near Ames, IA, with four hybrids and three tillage systems (no-till, disk, and moldboard plow) was conducted to examine the effects of tillage systems, hybrids, and their interactions on shoot and root dry weights, leaf development, mature-plant height, final plant stand, and grain yield. Moldboard plowing or disking increased vegetative growth relative to no-till. Hybrids responded differently to the three tillage systems only during vegetative growth. Hybrids 2 and 3 had greater increases in shoot growth in response to moldboard plowing than to disking. Hybrid 3 also had a greater increase in root dry weight and leaf stage with moldboard plowing than with disking. Response to tillage for mature-plant measurements differed between years but not between hybrids. No-till plots had shorter mature plant heights (1.87 m) and lower grain yields (6.98 Mg ha−1) than moldboardplowed plots (1.96 m; 8.34 Mg ha−1) only in 1982. Grain moistures of no-till plots averaged over years were 28 g kg−1 greater than those of moldboard-plowed plots. Results of this study indicate that during vegetative growth, corn hybrids respond differently to tillage systems. Further evidence of hybrid ✕ tillage interactions, however, is needed to justify development of corn hybrids adapted to specific tillage systems.

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