PHENOLOGICAL STUDIES OF THREE NATURAL STANDS OF JOJOBA (SIMMONDSIA CHINENSIS (LINK) SCHNEIDER) NEAR TUCSON, ARIZONA.

Persistent Link:
http://hdl.handle.net/10150/185715
Title:
PHENOLOGICAL STUDIES OF THREE NATURAL STANDS OF JOJOBA (SIMMONDSIA CHINENSIS (LINK) SCHNEIDER) NEAR TUCSON, ARIZONA.
Author:
DE OLIVEIRA, JONAS PAES.
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:
Jojoba (Simmondsia chinensis (Link) Schneider) is a wild desert shrub known for the liquid wax extracted from its fruits. As the plant undergoes the first stages of domestication into a commercial crop, it is important to understand its response to environmental factors and to study its regularity of production. Phenological studies including vegetative growth, floral biology, seed production, and seed wax content were conducted from 1979 to 1982, complementing investigations in 1978 in three natural stands of jojoba, near Tucson, Arizona and air and soil precipitation, temperatures were continuously recorded at each study site. Periods of vegetative growth were identical for staminate and pistillate plants and were generally observed after the occurrence of measurable rainfall. In late winter vegetative growth occurred after monthly average minimum temperatures of 4-5°C, although local responses to small differences in temperature were observed. Anthesis was first observed in late February or early March. Fruits generally originated from flower buds produced in the previous summer. Incidence of fruit abortion was greatest in May and June. Variations from year to year in seed production from 1978 to 1982 suggested biennial bearing. Factors in addition to frost incidence were believed to be associated with the absence of seed production in 1979 and the low seed crop of 1981. Levels of foliar total nonstructural carbohydrates were not found to be appreciably different between a low production year and a high production one. Seed wax percent was found to be independent of annual variation in seed production. Plant growth and productivity was greatest on the site with the best developed soil profile, highest water holding capacity and highest exchangeable sodium percentage.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Jojoba -- Arizona -- Tucson Region.; Phenology -- Arizona -- Tucson Region.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Plant Sciences; Graduate College
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titlePHENOLOGICAL STUDIES OF THREE NATURAL STANDS OF JOJOBA (SIMMONDSIA CHINENSIS (LINK) SCHNEIDER) NEAR TUCSON, ARIZONA.en_US
dc.creatorDE OLIVEIRA, JONAS PAES.en_US
dc.contributor.authorDE OLIVEIRA, JONAS PAES.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.abstractJojoba (Simmondsia chinensis (Link) Schneider) is a wild desert shrub known for the liquid wax extracted from its fruits. As the plant undergoes the first stages of domestication into a commercial crop, it is important to understand its response to environmental factors and to study its regularity of production. Phenological studies including vegetative growth, floral biology, seed production, and seed wax content were conducted from 1979 to 1982, complementing investigations in 1978 in three natural stands of jojoba, near Tucson, Arizona and air and soil precipitation, temperatures were continuously recorded at each study site. Periods of vegetative growth were identical for staminate and pistillate plants and were generally observed after the occurrence of measurable rainfall. In late winter vegetative growth occurred after monthly average minimum temperatures of 4-5°C, although local responses to small differences in temperature were observed. Anthesis was first observed in late February or early March. Fruits generally originated from flower buds produced in the previous summer. Incidence of fruit abortion was greatest in May and June. Variations from year to year in seed production from 1978 to 1982 suggested biennial bearing. Factors in addition to frost incidence were believed to be associated with the absence of seed production in 1979 and the low seed crop of 1981. Levels of foliar total nonstructural carbohydrates were not found to be appreciably different between a low production year and a high production one. Seed wax percent was found to be independent of annual variation in seed production. Plant growth and productivity was greatest on the site with the best developed soil profile, highest water holding capacity and highest exchangeable sodium percentage.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectJojoba -- Arizona -- Tucson Region.en_US
dc.subjectPhenology -- Arizona -- Tucson Region.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplinePlant Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.identifier.proquest8313472en_US
dc.identifier.oclc688485743en_US
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