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This article in AJ

  1. Vol. 66 No. 4, p. 575-578
    Received: July 30, 1973



Plant Height, Grain Yield, and Yield Component Relationships in Spring Wheat1

  1. F. H. McNeal2,
  2. E. P. Smith3 and
  3. M. A. Berg2



The relationships of grain yield to plant height and yield components in spring wheat (Triticum aestivum L.) were studied in two yield nurseries in 1971 and 1972 at Bozeman, Montana, in order to determine if selection should be directed at yield, or at yield components. Genetic and environmental effects were separated by correlation analysis and analysis of variance.

Correlation coefficients computed with various combinations of replications, years, and cultivars or selections (genotypes) showed that cultivars account for most of the variation among both plant height and yield component comparisons. Simple correlation coefficients showed that grain yield was more closely related to heads/4.9 m than with kernels/head or kernel weight. A multiple correlation analysis between grain yield and yield components was found to be significant for only one of the two nurseries. Simple correlations among the three yield components were either negative or of a nonsignificantly positive value.

We were unable to determine whether selection should be based on grain yield or on one or more of the yield components. However, the i values among yield components provided very small R2 values, suggesting that compensating effects among yield components were small in this study.

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