Soil drying effects on spatial variability of soil hardpan attributes on pacolet sandy loam soil

dc.contributor.author	Tekeste, MZ	en
dc.contributor.author	Raper, RL	en
dc.contributor.author	Schwab, EB	en
dc.contributor.author	Seymour, L	en
dc.date.accessioned	2014-06-06T06:49:02Z
dc.date.available	2014-06-06T06:49:02Z
dc.date.issued	2009	en
dc.identifier.issn	21510032	en
dc.identifier.uri	http://62.217.125.90/xmlui/handle/123456789/4393
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-67650520002&partnerID=40&md5=3dca66b4ae6221966a328e6caf340915	en
dc.subject	Bulk density	en
dc.subject	Cone index	en
dc.subject	Hardpan	en
dc.subject	Semivariogram	en
dc.subject	Soil compaction	en
dc.subject	Soil moisture	en
dc.subject.other	Bulk density	en
dc.subject.other	Cone index	en
dc.subject.other	Hardpan	en
dc.subject.other	Semivariogram	en
dc.subject.other	Soil compaction	en
dc.subject.other	Cell membranes	en
dc.subject.other	Compaction	en
dc.subject.other	Dewatering	en
dc.subject.other	Forestry	en
dc.subject.other	Groundwater	en
dc.subject.other	Moisture determination	en
dc.subject.other	Permittivity	en
dc.subject.other	Soil conditioners	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Soil moisture	en
dc.subject.other	Curing	en
dc.subject.other	bulk density	en
dc.subject.other	compaction	en
dc.subject.other	geostatistics	en
dc.subject.other	growth rate	en
dc.subject.other	sandy loam	en
dc.subject.other	soil depth	en
dc.subject.other	soil moisture	en
dc.subject.other	soil structure	en
dc.subject.other	variogram	en
dc.subject.other	Alabama	en
dc.subject.other	Auburn	en
dc.subject.other	North America	en
dc.subject.other	United States	en
dc.title	Soil drying effects on spatial variability of soil hardpan attributes on pacolet sandy loam soil	en
heal.type	journalArticle	en
heal.publicationDate	2009	en
heal.abstract	Soil hardpans found in many of the southeastern U.S. soils reduce crop yields by restricting the root growth. Site-specific soil compaction management to alleviate this problem requires determination of the spatial variability and mapping of soil hardpans. The objective of this study was to determine the spatial variability of soil hardpan as influenced by soil moisture. Geo-referenced soil cone index measurements were taken in 200 grid cells (10 m × 10 m grid cell size) on Pacolet sandy loam soil (fine, kaolinitic, thermic Typic Kanhapludults) in Auburn, Alabama, on 29 June and 25 August 2004, representing ""wet"" and ""dry"" soil measurement dates. Core samples were also taken in 5 cm depth increments up to a depth of 65 cm for soil moisture and bulk density determinations. Statistical and geostatistical methods were used for the data analysis. In the 0-35 cm depth, the soil moisture had dried significantly by 25 August 2004 (dry) as compared to the soil moisture on 29 June 2004 (wet; P < 0.0001). An isotropic spherical semivariogram model best fit the semivariances of the peak cone index for wet (R 2 = 0.98) and dry (R 2 = 0.97) soil conditions. Soil drying increased the peak cone index and the maximum semivariance value (sill). Small but statistically significant differences (P < 0.0001) were also observed on the depth to the peak cone index as the soil dried in the 0-35 cm depth. In the dry soil condition, the semivariances of the depth to the peak cone index were nearly constant over the separation distances, suggesting that the depth to the hardpan did not exhibit substantial spatial dependence. © 2009 American Society of Agricultural and Biological Engineers.	en
heal.journalName	Transactions of the ASABE	en
dc.identifier.issue	3	en
dc.identifier.volume	52	en
dc.identifier.spage	697	en
dc.identifier.epage	705	en