A 60- by 60-ft plot of Nuttall saltbush (Atriplex nuttallii) was completely harvested using 1- by 1-ft sampling units. Yield data for sampling units of various sizes and shapes were obtained by combining contiguous 1- by 1-ft plots. Sampling unit size and shape both had an important effect on sampling efficiency. The coefficient of variation decreased rapidly, as sampling unit size increased, until a sampling unit of about 60 ft2 was reached. For the smaller sampling units, the rectangular units generally had a lower coefficient of variation than those that were nearly square. Data are presented showing the relationship between sampling units of various sizes and shapes and (1) their coefficient of variation, (2) the number of samples needed to obtain a yield estimate that is within 20% of the population mean 90% of the time, and (3) the total area needed to be sampled to obtain this yield estimate. This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020
Scholarly peer-reviewed articles published by the Society for Range Management. Access articles on a rolling-window basis from vol. 1, 1948 up to 5 years from the current year. Formerly Journal of Range Management (JRM). More recent content is available by subscription from SRM.