EFFECT OF NITROGEN FERTILIZATION AND GROWTH REGULATORS ON DELONIX REGIA SEEDLINGS GROWN IN SANDY SOIL

Document Type : Original Research Article

Authors

1 Hort. Dept., Fac. Agric., Minia Univ., Egypt.

2 Hort. Dept., Fac. Agric., Minia Univ., Egypt

Abstract

A pot experiment was carried out at the Fac. of Agric. Nursery, Minia Univ. to explore the response of Delonix regia seedlings to three nitrogen fertilization rates (10, 20 and 30 g/plot of ammonium sulphate (20.5 % N) and seven growth regulator treatments (0, GA3 at 50, 100 and 150 ppm and IAA at 25, 50 and 75 ppm).
The studied vegetative growth characters (plant height, stem thickness, crown diameter, number of leaves and dry weight of leaves, stem and roots) were gradually increased parallel to the increase in N fertilization rate. A similar trend, in response to N fertilization was observed for total chlorophylls content (a + b) and nitrogen % in the leaves. Concerning growth regulators, both GA3 and IAA effectively induced different vegetative growth traits and chemical determinations, except, for stem thickness, total chlorophylls and N % which were reduced due to GA3. The effectiveness of either GA3 or IAA was parallel to its concentration. The best growth of Delonix regia seedlings was achieved by supplying the plants with the high N fertilization rate (30 g/pot) along with either GA3 at 150 ppm or IAA at 75 ppm.

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Scientific Journal of Flowers and Ornamental Plants
Volume 5, Issue 2 - Serial Number 2
Special issue: The Fourth Conference of SSFOP
June 2018
Pages 141-149

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