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Sampling Technique for Estimation of Root Production of Kentucky Bluegrass 1
Author(s) -
Canode C. L.,
Hiebert A. J.,
Russell T. S.,
Law A. G.
Publication year - 1977
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1977.0011183x001700010009x
Subject(s) - poa pratensis , biology , sampling (signal processing) , sampling error , statistics , mathematics , root (linguistics) , agronomy , poaceae , observational error , linguistics , philosophy , filter (signal processing) , computer science , computer vision
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.