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Agronomy Journal Abstract -

Rapid Method For Measuring Kernel Density1


This article in AJ

  1. Vol. 76 No. 2, p. 307-309
    Received: Mar 16, 1982

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  1. L. Wessel-Beaver,
  2. R. H. Beck and
  3. R. J. Lambert2



A rapid, accurate, and reproducible method for measuring corn kernel density is needed if selection for density in a breeding program is to be effective. Comparisons of two methods involving the Archimedes principle for measuring corn (Zea mays L.) kernel density included 1) water displacement in a graduate cylinder and 2) a cage of kernels submerged in a tared water container resting upon a balance. Sixty samples of opaque-2 corn (45 kernels each with densities from 960 to 1250 kg m-3) were analyzed. The cage method required 67 vs. 136 min/60 samples for kernel volume measurements and was more repeatable (r = 0.94** vs. r = 0.67**). The coefficients of variation for the two methods and the two analysts ranged from 4.9 to 5.6%. The cage method is rapid, accurate and reproducible.

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