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Improving Nitrogen Use Efficiency of Potted Chrysanthemums Grown in a Subirrigation System

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Title: Improving Nitrogen Use Efficiency of Potted Chrysanthemums Grown in a Subirrigation System
Author: MacDonald, William N.
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Shelp, Dr. Barry J.Blom, Dr. Theo J.
Abstract: This thesis tested the hypothesis that nitrogen use efficiency of subirrigated potted chrysanthemum (Chrysanthemum morifolium Ramat.) can be improved by managing the NO3- status of the plant. Replacement of NO3- with water one week prior to flower development was the most effective method of reducing tissue NO3- content and improving the nitrogen usage index, as compared to various combinations of NO3- and Cl-. Shoot or flower dry mass and N content were unaffected and the medium electrical conductivity was reduced. Supplying N in the NH4+ form in combination with NO3- did not affect nitrogen use indices. Reducing N supply improved various indices of nitrogen use efficiency, with a slight loss of quality. Elimination of NO3- prior to flower development and reduction in N supplied are effective strategies for improving nitrogen use efficiency in subirrigated potted chrysanthemums without sacrificing quality.
URI: http://hdl.handle.net/10214/5532
Date: 2013-02
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