| Material Information
||Tolerance of Schefflera growing indoors to soluble salts
||ARC-A research report
||2 p. : ; 28 cm.
||Poole, R. T ( Richard Turk )
Conover, Charles Albert, 1934-
Agricultural Research Center (Apopka, Fla.)
||University of Florida, IFAS, Agricultural Research Center-Apopka
||Place of Publication:
||Plants -- Effect of salt on -- Florida ( lcsh )
Plants, Potted -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
bibliography ( marcgt )
non-fiction ( marcgt )
||Includes bibliographical references (p. 2).
||Statement of Responsibility:
||R.T. Poole and C.A. Conover.
||Florida Historical Agriculture and Rural Life
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
Electronic Data Information Source
site maintained by the Florida
Cooperative Extension Service.
Copyright 2005, Board of Trustees, University
TOLERANCE OF SCHEFFLERA GROWING INDOORS TO SOLUBLE SALTS
R. T. Poole and C. A. Conoverl
University of Florida, IFAS
Agricultural Research Center Apopka
ARC-A Research Report RH-84-4
Plants growing under interior conditions receive less light and
therefore utilize less water and fertilizer. Suggestions have been made
that fertilizer in the container medium be reduced in the production area
prior to movement indoors to improve acclimatization level (1). Previous
research (3) has shown that Dieffenbachia maculata 'Perfection' and Brassaia
actinophylla grown indoors one year grew best at the highest level of
fertilizer tested, 300 Ibs N/A-yr from a 3-1-2 ratio fertilizer. Another
experiment (4) showed that Dieffenbachia maculata 'Exotica' and Dracaena
marginata grew best during one year indoors when fertilized at the highest
level tested, 400 Ibs N/A-yr.
A test was initiated September 1, 1982, to determine tolerance of
Brassaia actinophylla (Schefflera) to various levels of soluble salts while
under interior growing conditions. Schefflera growing in 8 inch containers
with a Florida peat:builder's sand mix (3:1 by volume) were fertilized
with 8.5, 17.0, and 25.5 grams of 14-14-14 Osmocote surface applied to the
containers. Fourteen grams/3 months to an 8 inch container of 14-14-14,
equivalent to 2100 Ibs N/A-yr, is the suggested rate for production of
acclimatized plants (2). Plants in containers of each fertilizer level were
placed in light conditions of 150 ft-c or 5,000 ft-c maximum until December
17, 1982, when all plants started receiving 150 ft-c 12 hours daily. Some
plants which had been growing under 150 ft-c received no additional ferti-
lizer, but others grown at 150 ft-c and those grown at 5,000 ft-c received
a second application of fertilizer at the original rate. Soluble salts
were obtained January 5, 1983, and plants were graded March 31, 1983.
Although soluble salts were higher in containers receiving the higher
fertilizer levels (Table 1), soluble salts were still within an acceptable
range (5). Containers from plants in 5,000 ft-c light had less soluble
salts because of more frequent irrigations. All plants graded after 3 months
under the interior environment were of excellent quality (Table 1).
SUMMARY. Results from this test indicate that soluble salts may not
be as serious a problem as previously assumed. Leaching may not be required
prior to placement indoors if suggested fertilizer levels are used. However,
the highest fertilizer level tested in this experiment was not quite twice
the recommended level, and some producers have been observed to apply even
larger amounts of fertilizer which could be detrimental.
Professor, Plant Physiology and Professor and Center Director, ARC-Apopka,
1. Conover, C. A. and R. T. Poole. 1975. Acclimatization of Tropical
Foliage Plants. ARC-Apopka Research Report. RH-75-3.
2. Conover, C. A. and R. T. Poole.
Tropical Foliage Plant Crops.
1981. Guide for Fertilizing
ARC-Apopka Research Report. RH-81-1.
3. Conover, C. A. and R. T. Poole. 1981. Influence of Light and
Fertilizer Levels and Fertilizer Sources of Foliage Plants
Maintained Under Interior Environments for One Year. J. Amer. Soc.
Hort. Sci. 106(5):571-574.
4. Conover, C. A., R. T. Poole and T. A. Nell. 1982. Intensity and
Duration of Cool White Fluorescent Lighting and Fertilizer on
Growth and Quality of Foliage Plants. J. Amer. Soc. Hort. Sci.
5. Poole, R. T. 1981. Soluble Salts Interpretation. ARC-Apopka
Research Report. RH-81-3.
Table 1. Tolerance of Schefflera growing indoors 3 months to soluble
gm1 14-14-14/8" pot Maximum ft-c mhos x0l Plant grade2'3
(9/1/82-12/17/82) (9/1/82-12/17/82) (1/5/83) (3/31/83)
8.5 0 150 37 4.6
8.5 8.5 150 31 4.7
8.5 8.5 5,000 32 4.7
17.0 0 150 56 4.7
17.0 17.0 150 121 4.8
17.0 17.0 5,000 74 4.6
25.5 0 150 60 4.7
25.5 25.5 150 218 4.8
25.5 25.5 5,000 149 4.7
1 12 grams/8" pot suggested (2)
2 1 = poor, 5 = excellent quality
3 All plants grown under 150 ft-c 12/17/82-3/31/83.