Soil aggregate size distributions using X-ray images

dc.contributor.author	Tollner, EW	en
dc.contributor.author	Melear, ND	en
dc.contributor.author	Rodriguez, LA	en
dc.contributor.author	Wright, ME	en
dc.date.accessioned	2014-06-06T06:43:29Z
dc.date.available	2014-06-06T06:43:29Z
dc.date.issued	1998	en
dc.identifier.issn	00012351	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/1309
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0032124350&partnerID=40&md5=c88ba7793459353b527c049fc3e8f0d1	en
dc.subject	Aggregate size	en
dc.subject	Computed tomography	en
dc.subject	Geometric mean diameter	en
dc.subject	Rotary sieve	en
dc.subject	Stereology	en
dc.subject	Tillage	en
dc.subject	X-ray linescan	en
dc.subject.other	Computerized tomography	en
dc.subject.other	Cultivation	en
dc.subject.other	Sieves	en
dc.subject.other	X ray analysis	en
dc.subject.other	Geometric mean diameter (GMD)	en
dc.subject.other	Rotary sieve analysis	en
dc.subject.other	Stereology	en
dc.subject.other	Soils	en
dc.subject.other	aggregate size	en
dc.subject.other	size distribution	en
dc.subject.other	soil aggregate	en
dc.subject.other	tomography	en
dc.subject.other	X-ray analysis	en
dc.title	Soil aggregate size distributions using X-ray images	en
heal.type	journalArticle	en
heal.publicationDate	1998	en
heal.abstract	A procedure for measuring the size distribution of soil aggregates with X-ray computed tomography (CT) was proposed and evaluated with respect to accuracy and feasibility of determining significant differences among tillage plots. Results indicate that characteristic geometric description of soil aggregates from scanned images, corrected using stereological approaches for a convex solid, is consistent with values obtained with sieving. CT-measured maximum and minimum apparent diameter values were 0.7 to 0.9 times the caliper-based values for specific clods, with R 2 values of 0.8 to 0.9. The ratio of the CT based to the Sieve based values were as expected for a range of common convex solids. The geometric mean diameter (GMD) of soil aggregates predicted by rotary sieving and CT scanning are somewhat lower in magnitude and varied by plot, suggesting that rotary sieving process may have disrupted aggregates to varying extents across plots. Usage of the CT-based GMD values versus the rotary sieve-based GMD values resulted in identical determinations of relative differences among the respective GMDs from tillage plots. CT-based GMD values were obtained quickly since CT scanning avoids many time consuming sample preparation steps necessary for rotary sieve analysis.A procedure for measuring the size distribution of soil aggregates with X-ray computed tomography (CT) was proposed and evaluated with respect to accuracy and feasibility of determining significant differences among tillage plots. Results indicate that characteristic geometric description of soil aggregates from scanned images, corrected using stereological approaches for a convex solid, is consistent with values obtained with sieving. CT-measured maximum and minimum apparent diameter values were 0.7 to 0.9 times the caliper-based values for specific clods, with R 2 values of 0.8 to 0.9. The ratio of the CT based to the sieve based values were as expected for a range of common convex solids. The geometric mean diameter (GMD) of soil aggregates predicted by rotary sieving and CT scanning are somewhat lower in magnitude and varied by plot, suggesting that rotary sieving process may have disrupted aggregates to varying extents across plots. Usage of the CT-based GMD values versus the rotary sieve-based GMD values resulted in identical determinations of relative differences among the respective GMDs from tillage plots. CT-based GMD values were obtained quickly since CT scanning avoids many time consuming sample preparation steps necessary for rotary sieve analysis.	en
heal.publisher	ASAE, St. Joseph, MI, United States	en
heal.journalName	Transactions of the American Society of Agricultural Engineers	en
dc.identifier.issue	4	en
dc.identifier.volume	41	en
dc.identifier.spage	1207	en
dc.identifier.epage	1215	en