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Title: Effect of fertilizer rate on growth of six cultivars of Hedera helix
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Permanent Link: http://ufdc.ufl.edu/UF00065918/00001
 Material Information
Title: Effect of fertilizer rate on growth of six cultivars of Hedera helix
Series Title: AREC-Apopka research report
Physical Description: 3 p. : ; 28 cm.
Language: English
Creator: Chase, A. R ( Ann Renee )
Yuen, J. M. F
Agricultural Research and Education Center (Apopka, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1986
 Subjects
Subject: English ivy -- Growth -- Florida   ( lcsh )
English ivy -- Fertilizers -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 2).
Statement of Responsibility: A.R. Chase and J.M.F. Yuen.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065918
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70669706

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HISTORIC NOTE


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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(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida






10 14
Effect of Fertilizer Rate on Growth of Six Cultivars of Hedera helix

A. R. Chase and J. M. F. Yuen
University of Florida, IF ....."' ----
Agricultural Research and Education Center fiGC*a1cience
AREC-Apopka Research Report, RHr86-20 Library

OCT 14 1987
English ivy (Hedera helix) is a popular interior plant. The number of
cultivars of this plant has increased dramatically in t 1,,19a 87igs in
an effort to obtain different colors, shapes and gjrowtA b'09t Although
fertilizer recommendations have been made for Engl'ish ivy cultivars based
on research results (1), different cultivars may have different nutritional
needs with a single rate too little for some but too much for others. The
following research was performed on six cultivars of English ivy to
determine if differences in the optimum fertilizer rate occur.

Rooted cuttings of 'Glacier' were planted in steam-treated Canadian
peat and pine bark (1:1, v/v) amended with 1.5 Ib Micromax and 7 Ibs of
dolomite per cubic yard. Two cuttings each were planted in 4" pots and
grown on a greenhouse bench receiving a maximum of 1000 ft-c natural light
and temperatures between 60 and 85"F. Plants were top-dressed with
Osmocote 19:6:12 at the rate of 1.8, 3.6, 5.4, 7.2, 9.0, and 10.8 g/pot.
The recommended rate is 1.8 g/pot under these conditions. Ten pots were
used for each fertilizer level. Leachate soluble salts and total vine
length were determined two days after fertilization. At 4 weeks these
ratings were recorded again as well as percentage of plant foliage showing
marginal necrosis and fresh weights of tops and roots. The test was
performed between 17 March and 15 April, 1986.

The second test evaluated fewer fertilizer rates and five additional
cultivars. This test was performed between 22 April and 19 June, 1986,
with fertilizer rates of 1.8, 5.4, and 9.0 g/pot using English ivy (the
species), 'Spearpoint', 'Glacier', 'Manda Crested', 'Golddust', and 'My
Heart'. Methods and conditions were those described above except that
maximum light levels were 2200 ft-c and temperatures ranged from 65 to
95*F. Leachate soluble salts and total vine length were determined 1, 4,
and 8 weeks after fertilization. At 8 weeks, the top quality was also
recorded.

Soluble salts in the first test were very high for all fertilizer
rates and are reflected by the low root weights in all treatments (Table
1). In addition, severe marginal and tip necrosis occurred within 3 weeks
of fertilizer application and was proportional to fertilizer rate (Table
1). Plants fertilized at levels between 1.8 and 7.2 g/pot showed very
little damage with severe damage at higher levels. A trend toward reduced
vine length also occurred as fertilizer rate increased. However, in this



Associate Professor of Plant Pathology and Biologist II, respectively,
Agricultural Research and Education Center, 2807 Binion Rd., Apopka FL
32703.







test only the percentage of the foliage with necrosis showed a significant
response to fertilizer rate which was perhaps due to the excessive rate for
all plants.

In the second test, none of the plants showed signs of marginal
necrosis associated with excessive fertilizer applications. Soluble salts
levels were markedly lower as well (Table 2). Although fertilizer level
affected top quality and vine length on some cultivars, it was not
consistent for all those tested. Top quality was reduced as fertilizer
level increased for 'Manda Crested', 'Golddust', and 'My Heart' but not for
the other three cultivars (Table 3). In contrast, vine length was reduced
as fertilizer level increased for English ivy, 'Glacier', 'Golddust' and
'My Heart' only (Table 4). Growth of 'Spearpoint' was the most variable of
the cultivars showing no significant reaction to fertilizer level although
vine length was shortest for plants receiving the highest fertilizer rate.
'Golddust' and 'My Heart' were very sensitive to excess fertilizer with a
25 and 32% reduction in vine length, respectively. One of the most
interesting results was that both vine length and plant quality were not
affected on 4 of the 6 cultivars, indicating that several characteristics
should be evaluated before fertilizer recommendations are made.

Although cultivars of English ivy show marked differences in
sensitivity to overfertilization, all grew well at 1.8 g, the previously
recommended rate (1). Applications of greater than 5.4 g/pot generally
resulted in reduced top quality and/or vine length for most cultivars.
Marginal necrosis can be expected with higher rates during periods when
temperatures and light levels are low resulting in slower plant growth and
fertilizer use. Special care should be taken, therefore, during the winter
months use no more than the recommended rate of fertilizer.

Reference

1. Conover, C. A., and R. T. Poole. 1984. Light and fertilizer
recommendations for production of acclimatized potted foliage plants.
Foliage Digest 7(8):1-6.


Table 1. Effect of fertilizer level on growth of Hedera helix 'Glacier'.
(Test 1 was performed between 17 March and 15 April-, 1986T.
g Osmocote Soluble salts Vine length % foliar Fresh weight (g)
19:6:12
per 4" pot umhos/cm (inches) damagea tops roots

1.8 3312**b 7.1ns 0 ** 4.5ns 1.lns
3.6 5250 7.1 0 4.4 2.0
5.4 6875 6.9 0.2 4.5 1.8
7.2 11375 6.7 4.0 4.4 1.6
9.0 10812 6.5 17.5 4.1 2.0
10.8 13188 5.1 49.8 3.4 1.5

aFoliar damage was characterized by marginal and tip necrosis.
bSignificant effect at the 1% level (**) or no significant effect (ns).


-2-







Table 2. Effect of fertilizer level on soluble salts readings for six
Hedera helix cultivars. (Test 2 was performed between 22 April and
19 June, 1986).
g Osmocote Mean soluble salts umhos/cm (19 June)
19:6:12
-per 4" pot English Glacier Spearpoint Manda Golddust My Heart


1.8 738**a 812** 488** 512* 850ns 1075**
5.4 3750 3688 2938 2188 2225 3750
9.0 3625 3312 3250 3738 2200 3938

aSignificant effect at the 1% (**) or 5% (*) levels or no significant
effect (ns).


Table 3. Effect of fertilizer level on top quality for six Hedera helix
cultivars. (Test 2 was performed between 22 April and 19 June, 1986).

g Osmocote Mean top quality
19:6:12
per 4" pot English Glacier Spearpoint Manda Golddust My Heart


1.8 4.8nsb 4.0ns 4.4ns 4.7** 4.4** 4.4*
5.4 4.4 3.8 4.1 4.6 4.0 4.3
9.0 4.2 4.0 4.0 3.9 3.4 3.8


aTop quality was rated from 1 (dead) to 3 (moderate quality, salable) to 5
b(excellent quality, highly salable).
Significant effect at the 1% (**) or 5% (*) levels or no significant
effect (ns).


Table 4. Effect of fertilizer level on total vine length for six Hedera
helix cultivars. (Test 2 was performed between 22 April and 19 June,
1986).
g Osmocote Total vine length (inches)
19:6:12
per 4" pot English Glacier Spearpoint Manda Golddust My Heart

1.8 72.8**a 63.3** 80.4ns 68.2ns 39.2* 56.0**
5.4 62.0 51.6 71.8 64.3 34.1 43.3
9.0 56.3 43.8 66.3 64.0 29.5 37.8

aSignificant effect at the 1% (**) or 5% (*) levels or no significant
effect (ns).




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