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dc.contributor.authorDIAZ MUNOZ, FIDEL.
dc.creatorDIAZ MUNOZ, FIDEL.en_US
dc.date.accessioned2011-10-31T17:55:17Z
dc.date.available2011-10-31T17:55:17Z
dc.date.issued1983en_US
dc.identifier.urihttp://hdl.handle.net/10150/186003
dc.description.abstractPlants under variable water stress exhibit a contraction of their stem diameter. This variation can be monitored to determine the plant water status which, in turn, will lead us to a method of scheduling subsequent irrigation. In this dissertation, the possibility of determining the water status in cotton plants by automatically sensing their stem diameter variation was explored. A full description of the displacement sensor, the electronic circuits used for automatic stem diameter monitoring and the data analysis is given. Simultaneous measurement of the leaf water potential and the stem diameter variation were done for a total of eight days during an irrigation cycle. Statistical analysis was performed to infer the water status in the plant from the stem diameter variation. It was discovered that the stem diameter variation lags the water potential by two hours, and that there was no simple linear correlation between them. In fact, it was discovered that the stem diameter variation was not only a function of the leaf water potential of the plant as it was believed; but indeed, it is also a function of the soil water condition. According to the results obtained, a basic model to describe the relationship between the stem diameter variation and the plant and soil water condition was developed.
dc.language.isoenen_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.subjectPlants -- Absorption of water -- Measurement.en_US
dc.subjectStems (Botany) -- Measurement.en_US
dc.subjectCotton -- Irrigation.en_US
dc.titleSTEM DIAMETER MEASUREMENT AND ITS RELATIONSHIP TO WATER STATUS IN COTTON.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.identifier.oclc688634936en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.leveldoctoralen_US
dc.identifier.proquest8315281en_US
thesis.degree.disciplineElectrical Engineeringen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.namePh.D.en_US
dc.description.noteThis item was digitized from a paper original and/or a microfilm copy. If you need higher-resolution images for any content in this item, please contact us at repository@u.library.arizona.edu.
dc.description.admin-noteOriginal file replaced with corrected file April 2023.
refterms.dateFOA2018-06-23T00:54:23Z
html.description.abstractPlants under variable water stress exhibit a contraction of their stem diameter. This variation can be monitored to determine the plant water status which, in turn, will lead us to a method of scheduling subsequent irrigation. In this dissertation, the possibility of determining the water status in cotton plants by automatically sensing their stem diameter variation was explored. A full description of the displacement sensor, the electronic circuits used for automatic stem diameter monitoring and the data analysis is given. Simultaneous measurement of the leaf water potential and the stem diameter variation were done for a total of eight days during an irrigation cycle. Statistical analysis was performed to infer the water status in the plant from the stem diameter variation. It was discovered that the stem diameter variation lags the water potential by two hours, and that there was no simple linear correlation between them. In fact, it was discovered that the stem diameter variation was not only a function of the leaf water potential of the plant as it was believed; but indeed, it is also a function of the soil water condition. According to the results obtained, a basic model to describe the relationship between the stem diameter variation and the plant and soil water condition was developed.


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