STEM DIAMETER MEASUREMENT AND ITS RELATIONSHIP TO WATER STATUS IN COTTON.

Persistent Link:
http://hdl.handle.net/10150/186003
Title:
STEM DIAMETER MEASUREMENT AND ITS RELATIONSHIP TO WATER STATUS IN COTTON.
Author:
DIAZ MUNOZ, FIDEL.
Issue Date:
1983
Publisher:
The University of Arizona.
Rights:
Copyright © 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.
Abstract:
Plants 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.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Plants -- Absorption of water -- Measurement.; Stems (Botany) -- Measurement.; Cotton -- Irrigation.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Electrical Engineering; Graduate College
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleSTEM DIAMETER MEASUREMENT AND ITS RELATIONSHIP TO WATER STATUS IN COTTON.en_US
dc.creatorDIAZ MUNOZ, FIDEL.en_US
dc.contributor.authorDIAZ MUNOZ, FIDEL.en_US
dc.date.issued1983en_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.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.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectPlants -- Absorption of water -- Measurement.en_US
dc.subjectStems (Botany) -- Measurement.en_US
dc.subjectCotton -- Irrigation.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineElectrical Engineeringen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.identifier.proquest8315281en_US
dc.identifier.oclc688634936en_US
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