Vegetative growth, flowering and leaf nutrient concentration of boronia as affected by nitrogen level and form |
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| Authors: | K S Reddy and R C Menary |
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| Institution: | Department of Agricultural Science, University of Tasmania, GPO Box 252C, Hobart, Tasmania 7001, Australia |
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| Abstract: | Boronia (Boronia megastigma Nees, family Rutaceae) is an Australian woody shrub, producing strongly scented flowers at nodes. Increasing N levels from 0 to 25 mM in the nutrient solution increased the production of nodes, lateral shoots from these nodes and further nodes on these lateral shoots. With the same level of N, the order of number of node and lateral shoot production by N form was: combined NH4+plus NO3− > NH4+alone > NO3− alone. This increase in the number of nodes subsequently translated into increased number of axils initiating flower buds and then into fully developed flowers. However, increasing N levels decreased the percentage of flower buds developing to anthesis and individual flower weight. These decreases were attributed to continued vegetative growth during flower development. Increasing N levels increased the leaf N concentration with the concentration in the order NH4+ + NO3− > NH4+ > NO3−. Nitrogen form did not affect the leaf tissue concentration of P, K+, Ca2+ and Mg2+. At lower N levels, the concentrations of these nutrients in the leaf tissue were higher and may have reached toxic levels, causing toxicity symptoms on leaves. At higher N levels, the concentrations of these nutrients were diluted due to increased growth and no toxicity symptoms were produced. |
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| Keywords: | boronia (Boronia megastigma Nees) cut flower nitrogen form nitrogen nutrition |
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