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University of Arizona (1989)

Nitrogen fixation by alfalfa as affected by salt stress and nitrogen levels

Zhou, Maoqian

Titre : Nitrogen fixation by alfalfa as affected by salt stress and nitrogen levels

Auteur : Zhou, Maoqian

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1989

Résumé
The 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.

Mots clés : Alfalfa — Growth. ; Plants — Effect of nitrogen on. ; Nitrogen — Fixation. ; Plants — Effect of salts on.

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Page publiée le 3 février 2016, mise à jour le 21 février 2018