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Agronomy Journal Abstract -

Interpretive Analysis for Forage Yield Trial Data


This article in AJ

  1. Vol. 83 No. 4, p. 774-776
    Received: Sept 21, 1990

    * Corresponding author(s):
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  1. J. F. Pedersen ,
  2. K. J. Moore and
  3. Edzard Van Santen
  1. Agronomy and Soils Dep. Auburn University, AL 36849



Forage cultivar evaluation is often done in small plots with multiple harvests throughout the growing season. Data is often summarized by presenting a yearly total yield for each cultivar in addition to the mean for each harvest date. Data summarization often becomes burdensome and difficult to interpret. Regressing yield against a growth index associated with harvest dates can be utilized to describe forage perfomrmance in a concise and easily interpreted format. Subsets of data from tall fescue (Fesfuca arundinacea Schreb.) yield trials conducted in Alabama and Kentucky were used to demonstrate the technique. The analysis involves regressing yield of a cultivar against an index calculated as the mean of all entries at a harvest date minus the grand mean. The resulting regression coefficient (b) describes cultivar yield response over several harve its and is indicative of performance under variable growth conditions.

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