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    Author(s): C. B. Briscoe
    Date: 1963
    Source: Forest Society Journal 5(13): 3-8
    Publication Series: Miscellaneous Publication (MISC)
    PDF: View PDF  (2.16 MB)


    Initial field testing for forest tree improvement is essentially a comparison of genetic groups whether the level of comparison is of species, provenances, or individual trees. A good study design should be as economical as possible, for a given precision, and must be accurate. The latter is simply obtained by restricting the study to a specified set of conditions, replicating adequately within those conditions, and randomizing the groups being compared. Precision is improved by minimizing variation within a sampling unit, by keeping careful, accurate records, and by additional replications. In Puerto Rico, studies utilize one-tree plots, in 16 contour rows per block, three blocks per location, and four to eight locations on a major soil type, a total of 192 to 384 seedlings of each species under test. This arrangement is believed 'to give maximum precision and accuracy at minimum costs, under local conditions.

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    Briscoe, C. B. 1963. Initial Field Testing for Forest Tree Improvement. Forest Society Journal 5(13):3-8.

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