Title: Precision, accuracy, and efficiency of four tools for measuring soil bulk density or strength.
Author: Miller, Richard E.; Hazard, John; Howes, Steven.;
Source: Res. Pap. PNW-RP-532. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 16 p
Publication Series: Research Paper (RP)
Description: Monitoring soil compaction is time consuming. A desire for speed and lower costs, however, must be balanced with the appropriate precision and accuracy required of the monitoring task. We compared three core samplers and a cone penetrometer for measuring soil compaction after clearcut harvest on a stone-free and a stony soil. Precision (i.e., consistency) of each tool at depths of 0-10, 10-20, and 20-30 cm was determined from two adjacent samples at 21 or more sampling points in each harvested location. Because one bulk density (Db) sampler provided a continuous sample of each decimeter depth, it was designated as the standard; thereby, the relative accuracy and bias of the two shorter core samplers could be calculated. Both shorter samplers overestimated Db as determined by the standard. At least 15 penetrometer samples could be taken and processed in the time required for three Db samples to the same 30-cm depth. Precision of measurements was taken by the core penetrometer, however was clearly less than that with any of the Db samplers. Based on time requirements and precision of each tool, we examined the efficiency of double sampling (using a combination of penetrometer and core sampler) for estimating Db. Results from the stone-free soil indicated an advantage in both precision and efficiency in applying double-sampling theory to estimate Db rather than sampling exclusively by the more time-consuming core samplers.
Keywords: Bulk density, measurement precision, relative accuracy, core penetrometer, soil strength
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to email@example.com to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
XML: View XML
Miller, Richard E.; Hazard, John; Howes, Steven. 2001. Precision, accuracy, and efficiency of four tools for measuring soil bulk density or strength. Res. Pap. PNW-RP-532. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 16 p
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility