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This article in CS

  1. Vol. 18 No. 5, p. 870-873
     
    Received: Mar 14, 1978


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doi:10.2135/cropsci1978.0011183X001800050049x

An Evaluation of Control Plots and Moving Means for Error Control in Barley Nurseries1

  1. C Mak,
  2. B. L. Harvey and
  3. J. D. Berdahl2

Abstract

Abstract

Frequently repeated control plots and the moving mean of adjacent plots were compared as methods of controlling error in single-row plots of barley, Hordeum sativum Jess. (H. vulgare L.) Adjustment by either technique was more effective for grain protein content than for grain yield. Covariance adjustment using either moving mean or control plots prevented overadjustment in several instances and was always more effective than percentage adjustment in reducing experimental error. Repeated control plots and moving means gave similar control of experimental error, but control plots had less practical application than moving means. A partially balanced lattice design accomplished superior control to both methods using percentage adjustment and similar control using covariance adjustment. In cases where the number of entries was too large to accommodate an incomplete block design, covariance adjustment using the moving mean would be advantageous.

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