Nitrogen fixation by alfalfa as affected by osmotic potentials and measured by nitrogen-15 techniques

Persistent Link:
http://hdl.handle.net/10150/276591
Title:
Nitrogen fixation by alfalfa as affected by osmotic potentials and measured by nitrogen-15 techniques
Author:
Cepeda, Jose de los Angeles, 1955-
Issue Date:
1987
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:
One low salt tolerant alfalfa (Medicago sativa L.) cultivar and two germination salt tolerant alfalfa selections were compared for growth and N fixation at four salinity levels (0, -0.3, -0.6 and -1.2 Mpa). In the first experiment a Hoagland's solution at 5 ppm-N was used; in the second experiment the solution had a 1 ppm-N concentration and supplemental light was used. No significant differences were found among the cultivars. This provides additional support that germination salt tolerance is not necessarily related to salt tolerance for growth. Nitrogen fixed to the first harvest was 61, 48, 49, and 27% of the total shoot N for plants in the control, -0.3, -0.6, and -1.2 Mpa solutions, respectively. At the second harvest, N fixation percentages were 94, 89, 80, and 57% for the corresponding salinity levels which showed significant reduction in N fixation at -0.3 Mpa. The evaluation of N fixation was by 15N techniques.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Plants -- Effect of salt on.; Nitrogen -- Fixation.; Alfalfa.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Soil and Water Science
Degree Grantor:
University of Arizona
Advisor:
Tucker, T. C.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleNitrogen fixation by alfalfa as affected by osmotic potentials and measured by nitrogen-15 techniquesen_US
dc.creatorCepeda, Jose de los Angeles, 1955-en_US
dc.contributor.authorCepeda, Jose de los Angeles, 1955-en_US
dc.date.issued1987en_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.abstractOne low salt tolerant alfalfa (Medicago sativa L.) cultivar and two germination salt tolerant alfalfa selections were compared for growth and N fixation at four salinity levels (0, -0.3, -0.6 and -1.2 Mpa). In the first experiment a Hoagland's solution at 5 ppm-N was used; in the second experiment the solution had a 1 ppm-N concentration and supplemental light was used. No significant differences were found among the cultivars. This provides additional support that germination salt tolerance is not necessarily related to salt tolerance for growth. Nitrogen fixed to the first harvest was 61, 48, 49, and 27% of the total shoot N for plants in the control, -0.3, -0.6, and -1.2 Mpa solutions, respectively. At the second harvest, N fixation percentages were 94, 89, 80, and 57% for the corresponding salinity levels which showed significant reduction in N fixation at -0.3 Mpa. The evaluation of N fixation was by 15N techniques.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectPlants -- Effect of salt on.en_US
dc.subjectNitrogen -- Fixation.en_US
dc.subjectAlfalfa.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineSoil and Water Scienceen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorTucker, T. C.en_US
dc.identifier.proquest1332456en_US
dc.identifier.oclc20039912en_US
dc.identifier.bibrecord.b1691014xen_US
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