Show simple item record

dc.contributor.authorCabral-Dominguez, Carlos Antonio Mayovanex, 1963-
dc.creatorCabral-Dominguez, Carlos Antonio Mayovanex, 1963-en_US
dc.date.accessioned2013-04-03T13:09:09Z
dc.date.available2013-04-03T13:09:09Z
dc.date.issued1991en_US
dc.identifier.urihttp://hdl.handle.net/10150/277999
dc.description.abstractSpatial variation of soil moisture content under a sub-surface drip irrigated field was studied. Conventional statistics and geostatistical methods were used to analyze the relation between four soil variables: % sand, % silt, % clay, and soil moisture content. The soil moisture content was measured before, during, and after irrigation using tensiometers. The samples were collected from 63 sites on a 180 by 244 meters (4.45-hectare) cotton field. The pre- and post-irrigation soil moisture content shared the same spatial structure, differing only by the magnitude of their variances. After any irrigation the soil wetter points remained wetter and the drier points remained drier. It was found that the spatial patterns of soil moisture content appear to be stable over time. The ranges obtained from the variograms before and after an irrigation had the same magnitude of influence. The coefficient of uniformity obtained using the gravimetric method was 92.4 %, however, using tensiometers values ranged from 84.4 to 87.3%.
dc.language.isoen_USen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subjectEngineering, Mechanical.en_US
dc.subjectEngineering, Mechanical.en_US
dc.titleSub-surface drip irrigation uniformity under spatially variable conditionsen_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.identifier.proquest1346416en_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.identifier.bibrecord.b27226529en_US
refterms.dateFOA2018-04-27T00:29:26Z
html.description.abstractSpatial variation of soil moisture content under a sub-surface drip irrigated field was studied. Conventional statistics and geostatistical methods were used to analyze the relation between four soil variables: % sand, % silt, % clay, and soil moisture content. The soil moisture content was measured before, during, and after irrigation using tensiometers. The samples were collected from 63 sites on a 180 by 244 meters (4.45-hectare) cotton field. The pre- and post-irrigation soil moisture content shared the same spatial structure, differing only by the magnitude of their variances. After any irrigation the soil wetter points remained wetter and the drier points remained drier. It was found that the spatial patterns of soil moisture content appear to be stable over time. The ranges obtained from the variograms before and after an irrigation had the same magnitude of influence. The coefficient of uniformity obtained using the gravimetric method was 92.4 %, however, using tensiometers values ranged from 84.4 to 87.3%.


Files in this item

Thumbnail
Name:
azu_td_1346416_sip1_m.pdf
Size:
3.948Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record