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dc.contributor.advisorTucker, Thomas C.en_US
dc.contributor.authorZhou, Maoqian, 1961-
dc.creatorZhou, Maoqian, 1961-en_US
dc.date.accessioned2013-03-28T10:33:39Z
dc.date.available2013-03-28T10:33:39Z
dc.date.issued1989en_US
dc.identifier.urihttp://hdl.handle.net/10150/277231
dc.description.abstractThe growth and Nitrogen fixation by one low salt tolerant alfalfa (Medicago sativa L.) and two germination salt tolerant selections inoculated with were investigated at two salt levels (0, -0.6 Mpa) and two N rates (1, 5ppm) using a system which automatically recirculates a nutrient solution. The high level of salinity (-0.6 Mpa osmotic potential of culture solution) resulted in substantial reduction in the N fixation percentage and total fixed N. The effect of salinity was more pronounced for later cuttings than for the earlier cutting. The N fixation percentages were substantially decreased by increasing N level and the reduction was enhanced by time. The N treatment levels did not exhibit a significant effect on total fixed N. Cultivars did not differ in either growth or N fixation. However, the interaction of N and salinity significantly decreased the percentage and amount of N fixation.
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.subjectAlfalfa -- Growth.en_US
dc.subjectPlants -- Effect of nitrogen on.en_US
dc.subjectNitrogen -- Fixation.en_US
dc.subjectPlants -- Effect of salts on.en_US
dc.titleNitrogen fixation by alfalfa as affected by salt stress and nitrogen levelsen_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.identifier.oclc24021905en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.identifier.proquest1339241en_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineSoil and Water Scienceen_US
thesis.degree.nameM.S.en_US
dc.identifier.bibrecord.b17721039en_US
refterms.dateFOA2018-09-04T04:47:07Z
html.description.abstractThe growth and Nitrogen fixation by one low salt tolerant alfalfa (Medicago sativa L.) and two germination salt tolerant selections inoculated with were investigated at two salt levels (0, -0.6 Mpa) and two N rates (1, 5ppm) using a system which automatically recirculates a nutrient solution. The high level of salinity (-0.6 Mpa osmotic potential of culture solution) resulted in substantial reduction in the N fixation percentage and total fixed N. The effect of salinity was more pronounced for later cuttings than for the earlier cutting. The N fixation percentages were substantially decreased by increasing N level and the reduction was enhanced by time. The N treatment levels did not exhibit a significant effect on total fixed N. Cultivars did not differ in either growth or N fixation. However, the interaction of N and salinity significantly decreased the percentage and amount of N fixation.


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