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Group Title: Research report - Agricultural Research and Education Center - RH-1982-26
Title: Growth of foliage plants at various night temperatures
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Permanent Link: http://ufdc.ufl.edu/UF00066500/00001
 Material Information
Title: Growth of foliage plants at various night temperatures
Series Title: Research report
Physical Description: 4 p. : ; 28 cm.
Language: English
Creator: Poole, R. T ( Richard Turk )
Conover, Charles Albert, 1934-
Agricultural Research Center (Apopka, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1982
 Subjects
Subject: Foliage plants -- Effect of temperature on -- Florida   ( lcsh )
Foliage plants -- Effect of cold on -- Florida   ( lcsh )
Greenhouses -- Climate   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: R.T. Poole and C.A. Conover.
General Note: Caption title.
Funding: ARC-A research report ;
 Record Information
Bibliographic ID: UF00066500
Volume ID: VID00001
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 71225851

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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
Electronic Data Information Source
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site maintained by the Florida
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Copyright 2005, Board of Trustees, University
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7 0. GROWTH OF FOLIAGE PLANTS AT VARIOUS NIGHT TEMPERATURES

R. T. Poole and C. A. Conover
University of Florida, IFAS .
Agricultural Research Center-Apopka
Research Report, RH-1982-26 .


Only a few years ago many foliage plant nurseries maintained-minimum
night temperatures of 65 to 700F or above, but presently temperature is
often lowered to 550F. While night temperatures of 600 and above do occur
during December, January and February in Central Florida, temperatures in
the 40s and 50s are more frequent and some nights have low temperatures in
the 20 to 300F range. The studies described below were initiated to
determine the influence of low night temperature on foliage plant growth.

November 15, 1978, Aglaonema 'Fransher', Maranta leuconeura Kerchoviana
and Aphelandra squarrosa 'Dania' were placed in glass greenhouses maintained
at 60, 65 or 700F minimum night temperature. Plants were grown in 6" pots
containing a mix of Florida peat:pine bark:cypress shavings (2:1:1 by volume)
containing 7 lb dolomite and 2 lb Perk per cubic yard. Plants received 4
grams 14-14-14 Osmocote per pot and were grown with maximum illumination of
1500 foot candles. Plants were graded and measured March 22, 1979.

A second experiment with Dieffenbachia 'Marianne', Nephrolepis exaltata
(Boston fern) and Epipremnum aureum (Golden pothos) was initiated November 1,
1979 and terminated January 18, 1980. Plants were grown under the same
conditions as the first experiment.

A third experiment was initiated January 4, 1980 and terminated March 25,
1980. Plants utilized were Philodendron oxycardium (cordatum), Dracaena
marginata, Brassaia actinophylla, Aglaonema 'Fransher', Ficus benjamin,
Syngonium podophyllum, Spathiphyllum 'Mauna Loa' and Polyscias balfouriana.
Cultural conditions were the same as previous experiments.

In an effort to determine whether a few nights at cool temperatures
would affect plant growth, a fourth experiment was initiated to examine the
effect of 1, 2 or 3 nights per week of cool temperatures on growth of Brassaia
actinophylla (schefflera). Plants in 6 inch containers were moved 1, 2 or 3










times each week to 50, 55 or 600F rooms and kept there from 5 PM until
8 AM. At other times they were kept at 650F minimum night temperature,
as was a check treatment. Other conditions were the same as previous
experiments. This experiment was initiated March 16, 1981 and
terminated May 28, 1981.

Most plants were not greatly affected by differences in minimum night
temperatures of 60, 65 or 700F (Table 1). Maranta and Aphelandra grew
slightly better at the lower temperatures but Epipremnum grew much slower
at 60F. Other plants tested showed slight or no increases in plant
quality or size as temperature was raised from 60 to 700F. Results from
these studies showed that plant growth was not greatly reduced when
temperatures are kept at 600F minimum night temperature, although a delay
of 1 to 2 weeks growth probably occurred when compared between the lowest
(600F) and the highest temperature (700F). During the growth periods
observed records were kept of running time on heaters in the different
greenhouses (each greenhouse was the same size and had heaters of the same
size, type and make). It was observed that fuel usage at 70F was double
the usage at 600F. The apparent large difference related to the fact that
when winter is averaged, the night temperature is, of course, much nearer
600F and thus, to maintain 700F required more fuel.

Growth of schefflera actually seemed improved by cool night
temperatures several nights during the week (Table 2). Results from this
experiment indicate that lowering the thermostat up to 3 nights a week when
outside air temperature is extremely low could result in considerable fuel
reduction without a reduction in schefflera plant growth.


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Table 1. Growth of foliage plants at various minimum night temperatures.

Temp Length
Plant (oF) Grade (cm)

Maranta leuconeura2 60 4.6 18
65 3.0 17
70 3.3 16
Aglaonema 'Fransher'2 60 2.0 40
65 2.0 40
70 2.4 43
2
Aphelandra squarrosa 60 4.0 28
65 4.0 27
70 3.8 27
Epipremnum aureum3 60 3.5 115
65 4.2 165
70 4.6 179
Dieffenbachia 'Marianne'3 60 4.4 52
65 4.7 54
70 4.7 56
Nephrolepis exaltata3 60 3.4 33
65 3.4 34
70 3.8 37
Philodendron 'cordatum'4 60 3.4 30
65 3.6 35
70 3.6 34
Dracaena marginata4 60 2.9 42
65 2.7 40
70 3.0 42
Brassaia actinophylla4 60 3.2 32
65 3.5 36
70 3.6 36
Aglaonema 'Fransher' 60 3.7 30
65 3.8 29
70 4.0 34
Ficus benjamin4 60 3.2 48
65 3.4 48
70 3.3 44
Syngonium podophyllum4 60 2.5 15
65 2.6 14
70 2.8 15
4
Spathiphyllum 'Mauna Loa' 60 3.0 44
65 3.1 43
70 3.2 44
Polyscias balfouriana4 60 3.8 55
65 3.9 57
70 4.0 58
1 = poor; 5 excellent quality. 2November 15, 1978-March 22, 1979.
3November 1, 1979-January 18, 1980. 4January 4, 1980-March 25, 1980.






Table 2. Growth of Schefflera subjected

1981 May 28, 1981.


to various night temperatures: March 16,


Night No.nights/ Growth(cm) Grade
temp, OF week1 3/16 4/14 3/16 5/28 4/14 5/28

50 1 4 25 4.8 4.8

2 6 30 4.6 4.6

3 2 26 4.4 4.8


55 1 5 22 4.2 4.4

2 4 20 4.8 4.6

3 2 19 5.0 4.6


60 1 3 21 4.4 4.4

2 6 25 5.0 4.8

3 1 17 4.6 4.6


65 7 2 17 4.6 4.6


When not at designated temperature,
2
1 = poor; 5 = excellent quality.


plants were maintained at 650F.




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