Group Title: CFREC-Apopka research report - Central Florida Research and Education Center-Apopka ; RH-89-10
Title: Nutrition of Radermachera sinica
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 Material Information
Title: Nutrition of Radermachera sinica
Series Title: CFREC-Apopka research report
Physical Description: 3 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Poole, R. T ( Richard Turk )
Central Florida Research and Education Center--Apopka
Publisher: University of Florida, IFAS, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1989
Subject: Foliage plants -- Fertilizers -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
Bibliography: Includes bibliographical references (p. 2).
Statement of Responsibility: A.R. Chase and R.T. Poole.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065874
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70551623

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The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
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site maintained by the Florida
Cooperative Extension Service.

Copyright 2005, Board of Trustees, University
of Florida

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SIoHL ,Library

JAN 11 1990
Nutrition of Radermachera sinica
2 University of Florida
A. R. Chase and R. T. Poole '
University of Florida, IFAS
Central Florida Research and Education Center Apopka
CFREC-Apopka Research Report, RH-89-10

Radermachera sinica Hemsl., sometimes called the Radar Plant or China
Doll is a relative newcomer to the foliage plant industry but is already
being grown in many nurseries. China Doll has large, dark green bipinnate
foliage and grows well in light sandy soils in a wide range of light
levels. The following research was conducted to determine the optimum
level of a slow-release fertilizer for production of good quality plants,
as well as corresponding values for leachate electrical conductivity (EC)
(soluble salts) readings and tissue elemental content.
Seedlings were obtained from a commercial producer when they were
approximately 5 inches tall and planted in 6-inch pots containing Canadian
peat and pine bark (1:1 by volume). The medium was amended with 7 lbs
dolomitic lime and 1.5 lbs Micromax (micronutrient source from Sierra
Chemical Co.) per cubic yard. Fertilizer treatments consisted of six
levels of Osmocote 19:6:12 (from Sierra Chemical Co.): 2, 6, 10, 14, 18,
and 22 g/pot. Fertilizer was applied once on 7 March 1989 as a
top-dressing to 10 pots per treatment. Leachate EC was recorded 3 days
after fertilization and again at test completion (about 4 weeks later) and
was determined by watering plants with about 3-4 oz of deionized water and
collecting the leachate in a beaker placed below the pot. After 4 weeks,
plants had grown about 6 to 8 inches and plant height and top quality were
recorded. Leaf tissues were collected from five plants in each of four of
the fertilizer levels (2, 6, 14, and 22 g/pot). Tissue was dried at 140F
ground, and sent to A & L Southern Laboratories for elemental analyses.
Levels of fertilizer tested did not affect height or quality of China
Doll with all plants good to excellent and salable. The plants were able
to grow in a wide range of soluble salts (leachate EC) from about 300 to
4450 pmhos/cm at the end of the test (Table 1). A ten-fold increase did
not affect growth or quality. A previous report on growth response of
China Doll to Osmocote rate showed very similar results with plant grade
unaffected by Osmocote rate (3). Although the high fertilizer rate was 10
times the low rate, tissue elemental content less than doubled for the
elements tested (Tables 2 and 3). This may indicate a loss of nutrients
through leaching or use by the plant. All nutrients analyzed were
approximately equal to those suggested for some other good quality foliage
plants with the exception of iron which appears slightly lower (1, 2).

IProfessor of Plant Pathology and Professor of Ornamental Horticulture,
respectively, Central Florida Research and Education Center Apopka, 2807
Binion Rd., Apopka, FL 32703.
Special thanks to A & L Southern Agricultural Laboratories for conducting
tissue analyses for some of the plants included.

Summary: Since China Doll plants grow well at low fertilizer rates, the
minimum' amount of fertilizer should be used. This will reduce fertilizer
costs and potential for ground water contamination. Growers should monitor
leachate soluble salts to maintain the appropriate fertilizer level.


1. Conover, C. A. and Poole, R. T. 1984. Light and fertilizer
recommendations for production of acclimatized potted foliage plants.
ARC-A Research Report RH-84-7.

2. Poole, R. T., Chase, A. R. and Conover, C. A. 1988. Chemical
composition of good quality tropical plants. Revision. CFREC-Apopka
Research Report RH-88-6.

3. Poole, R. T. and Conover, C. A. 1987. Fertilization of several
foliage plants. Proc. Interam. Soc. Trop. Hort. 31:35-41.

Table 1. Effect of Osmocote 19-6-12 level on leachate electrical
conductivity of Radermachera sinica.

g Osmocote Leachate electrical conductivityb
19-6-12 (pmhos/cm)
per 6" pota 10 March 1989 7 April 1989

2 798**0 331**
6 1332 763
10 2049 1532
14 2335 2515
18 2542 3105
22 2730 4450

aFertilizer was applied on 7 March 1989.
bElectrical conductivity was determined for leachate by adding
deionized water to the potting medium surface until 3.5 oz of
leachate collected in a beaker under the pot.
"Effects were significant at the 1% level.



* i ( -v* ;

Table 2. Effect of Osmocote 19-6-12 level on tissue nutrient content of
major elements for Radermachera sinica.

g Osmocote Percent dry weight
per 6" pota Nitrogen Phosphorus Potassium Sulfur Calcium Magnesium

2 2.38**c 0.26** 1.32** 0.16ns 0.50ns 0.44ns

6 3.46 0.34 2.04 0.18 0.52 0.44

14 3.88 0.37 2.61 0.22 0.54 0.45

22 4.32 0.35 2.21 0.24 0.50 0.40

aFertilizer was applied on 7 March 1989.
bTissue was harvested on 11 April 1989.
CSignificant effects were denoted at the 1% (**) level or not significant

Table 3. Effect of Osmocote 19-6-12 level on tissue nutrient content of
minor elements for Radermachera sinica.

g Osmocote Parts per million (ppm)b
per 6" pota Sodium Iron Aluminum Zinc Manganese Boron Copper

2 0.02*c 39* 10ns 108* 80** 30ns 6.4**
6 0.04 44 10 103 114 24 7.2
14 0.03 52 34 134 173 22 9.0
22 0.03 56 52 145 176 22 9.8

aFertilizer was applied on 7 March 1989.
bTissue was harvested on 11 April 1989.
CSignificant effects were denoted at the
significant (ns).

1% (**) or 5% (*) levels or not


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