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United States Department of Agriculture

Agricultural Research Service

Title: Response to "comments on 'simultaneous Measurement of Soil Penetration Resistance and Water Content with a Combined Penetrometer-Tdr Moisture Probe¿ and `a Dynamic Cone Penetrometer for Measuring Soil Penetration Resistance¿¿

Author
item Herrick, Jeffrey

Submitted to: Soil Science Society of America Journal
Publication Type: Other
Publication Acceptance Date: November 10, 2004
Publication Date: N/A

Technical Abstract: A new equation accounting for momentum may more accurately reflect the energy transmitted from the sliding hammer to an impact penetrometer. The equation partially accounts for differences in calculated resistances made with hammers of variable mass. However, the fact that it does not fully account for these differences reinforces our conclusion (and the conclusion of the authors of the new equation) that penetrometer data should continue to be treated as relative values and comparisons should be limited to penetrometers of similar mass and dimensions regardless of the equation used. This restriction is similar to that applied to comparisons generated using the more common strain gauge penetrometers: treatment comparisons must be limited to instruments with similar dimensions that are inserted at a consistent rate.

Last Modified: 10/30/2014
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