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This article in CS

  1. Vol. 17 No. 1, p. 28-30
     
    Received: Feb 2, 1976
    Published: Jan, 1977


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doi:10.2135/cropsci1977.0011183X001700010009x

Sampling Technique for Estimation of Root Production of Kentucky Bluegrass1

  1. C. L. Canode,
  2. A. J. Hiebert,
  3. T. S. Russell and
  4. A. G. Law2

Abstract

Abstract

This research was initiated because of the variability encountered in previous root samplings of Kentucky bluegrass (Poa pratensis L.) and the expense and time used in securing root weights. Root weight uniformity trials were conducted in two fields of ‘Merion’ Kentucky bluegrass to determine the number of samples and replications needed to measure production at various levels of precision. The most precision which appeared practical was about a 5% error of the sample mean. In experiments having four replications and a root sample mean of about 8.5 g/core, a 5, 6, 7.5, and 10% error of the mean could be expected with 12, 8, 4, and 2 samples per plot, respectively. The number of samples taken from each experimental unit was the primary factor in reducing variability; shape of the plot had little influence on variability.

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