Group Title: brief summary of the report on the preliminary trials with a root-inducing substance at the University of Florida
Title: A Brief summary of the report on the preliminary trials with a root-inducing substance at the University of Florida
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Permanent Link: http://ufdc.ufl.edu/UF00094980/00001
 Material Information
Title: A Brief summary of the report on the preliminary trials with a root-inducing substance at the University of Florida
Physical Description: 2 leaves : ; 28 cm.
Language: English
Creator: Watkins, John V.
University of Florida -- Dept. of Ornamental Horticulture
Publisher: University of Florida, Dept. of Ornamental Horticulture
Place of Publication: Gainesville, Fla.
Publication Date: 1937
Copyright Date: 1937
 Subjects
Subject: Plants, Ornamental -- Roots -- Propagation -- Florida   ( lcsh )
Roots (Botany)   ( lcsh )
Growth (Plants)   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
General Note: Caption title.
Statement of Responsibility: by John V. Watkins.
 Record Information
Bibliographic ID: UF00094980
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 436442757

Full Text



A BRIEF SUMMARY OF THE REPORT ON THE PRELIMINARY TRIALS WITH A
ROOT-INDUCIfG SUBSTANCE AT THE UNIVERSITY OF FLORIDA.
by
John V. Watkins
Assistant Horticulturist.

This summary has been compiled i oa condensed form from the org-
inal article which appeared in the ?ri~giatia r- aange for t ly i, .
1937. It is our hope that Nurserytmn maf f alt i useful in "'
ing out concentration of Hormodin for the traj .a l
plant materials. Extensive tests are under ay at he Utilvereity
and additional reports will be prepared as soon as the data are avail-
able.
The success in the rooting of cuttings of Northern plant species
with certain root inducing substances, within the last two years,
prompted a series of preliminary tests at the University of Florida.
For these trials we selected a representative group of semi-tropical
and tropical plants that are valuable from an ornamental or from an
economic aspect.

MATERIALS AND METHODS
One of the compounds known to accelerate the rooting of cuttings
is Hormodin A (indolebutyric acid). This substance, made by Merck &
company, Rayway, N. J., as furnished through the courtesy of the
Boyoe Thompson Institute for Plant Research at Yonkers, N. Y., and
the treatments were carried out as recommended for northern species
by that Institution. The chemicals, in varying concentrations, were
poured into labeled beakers and into these solutions, the cuttings
were inserted and left for varying lengths of time: 18, 24, or 48
hours. After the given time had elapsed, the cuttings were rinsed
with water and with the proper labels, were inserted in the root-
ing medium composed of one-third peat moss and two-thirds local white
sand. The cuttings were set at considerable slant so that the leaves
were near or actually lay upon the wet medium. After the cuttings
were inserted in the rooting medium, they were gently flooded in with
- *- tee to pack the medium, then cheesecloth was spread directly. on top
of the leaves. Subsequently watering was applied to this cloth.
The cuttings were made about 4 in. in length and two to four leaves
were left on each. In no case was the leaf area reduced by trimming
until it was necessary to do so for purposes of photographing.

EXPERIMENTAL RESULTS
The attached table indicates that cuttings of many species of semi-
tropical and tropical plants produce heavy root systems much more rap-
idly if the cuttings are treated with solutions of growth substances
than when inserted in the rooting medium without such treatment. We
list, for reasons of simplicity and clarity, only the species and their
respective concentrations that have commercial nursery possibilities,
as shown by our preliminary trials.
It is important that a large series of tests be run in order to
find the most suitable concentration for each species.
Detail data are shown in tabulated form below.

DISCUSSION
During the course of these trials a number of interesting obser-
vations were made. Some of these are:
1. Hormodin has definite root inducing power.
2. The number of roots induced on a given species varied with thu
concentration of the substance, increasing up to an optimum
dosage after which the chemical retarded rooting or injured the
tissue.
3. Using the same range of concentrations for several species at thB
same time disclosed the fact that the optimum concentration vari-
ed with the species.
4. The time required for production of roots after chemical treat-
ment of cuttings varies with the species, resembling the same com-
parative time relationships required under natural conditions.
5. Some species did not respond under the conditions of our experi-
ments.
6. The tests were made in the spring just as new growth was starting.
Subsequent research has shown that the fall is the more favorable
season for propagation most Florida shrubs.








Rooting Response
Name of Hormodin No.of No.well No.with Living : Weeks
Plant "A" in Outgs.: rooted fair but not : Dead in
B. T. I. used :roots rooted : rtg.
units. :medium
Ligustrum A20 8 4 4 0 0
ovalifolium A40 8 5' 3 0 0 3-1/2
(California Ok 8 O 0 8 0 W fO
privet)
lageratroemia A10 9 7 0 72 0
indica A20 9 6 3 0 0 3-1/2
(Crepe myrtle)A40 9 6 3 0 0 weeks
Ck 9 0 0 9 0
Viburnum A10 11 9 1 1 0
odorotissimum A20 11 8 0 3 0 5
A40 11 7 3 1 0 weeks
Ok 11 0 4 7 0
Ficus carica A40 5 5 0 0 0 5
(Celeste Fig.)Ck 5 2 0 3: 0 weeks
The treated cuttings had dormant terminal buds, while the check cut-
tings were leafed out when the data were taken.
Psidium A40 9 5 4 0 0 5
guayaba Ok 9 0 0 9 0 weeks
AGuava)
Azalea indica AO0 10 4 6 0 0 5
Variety A40 14 10 4 0 0 weeks
"Formosa" Ok 14 0 5 9 0
Ligustrum A40 16 6 0 10 0 5
aponicum Ok 16 2 2 12 0 weeks
(Wax privet)
Podocarpus A40)24 10 3 4 3 0
macrophylla Ok )hrs. 10 1 4 5 0 7
maki weeks
(Japanese yew)A40) 10 4 4 2 0
k )rs. 1oJ 2 3 5 0
Ilex cornuta A20 10 5 2 3 0 7
(Chinese Holl40 10 10 0 0 0 weeks
Ok 10 0 0 10 0
Citrus A40 11 4 0 7 0 7
aurantium Ok 11 0 0 11 0 weeks
(Sour orange)
Pineapple A20 9 8 0 1 0 7
Pear A4Q 12 5 0 2 5 weeks
Ok 10 0 0 10 0
Ficus A40 8 8 0 0 0 7
repens A80 8 4 2 1 1 weeks
(Creeping Ok 8 0 0 8 0
fig)
Podocarpus A60 10 9 1 0 0 8
nagi Ck 10 0 1 9 0 weeks
Camellia A60 6 6 0 0 0 8
Sasaqua A80 6 6 0 0 0 weeks
seedling Ok 6 1 3 2 0
Cephalotaxus A40 8 5 2 1 0
drupacea A60 24 8 6 2 0 0
A80 hrs. 8 2 4 2 0 8
Ok 8 0 1 7 0 weeks
A40)48 8 6 1 1 0
hrs.
Severinia A10 12 11 0 1 0
buxifolia A20 12 9 0 3 0 10
old outgs. A40 12 7 1 4 0 weeks
Ok 12 1 2 9 0
Camellia A40 9 7 1 1 0 10
japonica A80 9 7 1 1 0 weeks
Ok 9 2 1 6 0


JVW
10/14/37
150




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