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Group Title: Research Report - University of Florida, Institute of Food and Agricultural Sciences ; 90-14
Title: Gibberellic acid application
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Permanent Link: http://ufdc.ufl.edu/UF00075772/00001
 Material Information
Title: Gibberellic acid application
Series Title: Research Report - University of Florida, Institute of Food and Agricultural Sciences ; 90-14
Physical Description: Book
Language: English
Creator: Mortensen, J. A.
Publisher: University of Florida, Institute of Food and Agricultural Sciences, Central Florida Research and Education Center
Publication Date: 1990
 Record Information
Bibliographic ID: UF00075772
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 123970794

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UNIVERSITY OF FLORIDA

CENTRAL FLORIDA RESEARCH
EDUCATION CENTER, LEES1
5336 UNIVERSITY AVE
TELEPHONE: 904/787-34;
(GAINESVILLE LINE 392-7;


UNIVERSITY OF FLORIDA

INSTITUTE OF FOOD AND AGRICULTURAL SCIENCES



LEESBURC-FLORIDA 34748
H AND
B CenURGtr Science
G Library'
23
7) GIBBERELLIC ACI ACIAPPLICATION SEp 1990


John A. Mortensen


The best time to apply gibberellin is 2 weeks after Orlando Seedless
grapevines reach full bloom. Full bloom is defined as 50% to 70% open blooms
on 50% of the clusters of the vine.

The most commonly found source of Gibberellic Acid is called Pro-Gibb
(Abbott Laboratories). It is marketed in liquid form at 3.91% concentration.


Quantity of concentrate needed


Desired application rate (ppm)


150


per gallon



1 teaspoon*

1.5 teaspoons

2 teaspoons

1 tablennnn


per 100 gal.


1 pint


24 ounces

1 quart
48R nrunp


* 1 teaspoon of liquid equals approx. 5 ml

Parts per million (ppm) is figured by multiplying the 3.91% by 10,000
(3.91% = 39,100 parts per million). For application to the vines you need
about 100 ppm instead of the 39,100 ppm in concentrated Pro-Gibb; thus you
need 39,100 100 = 391 ml of water for every one ml of Pro-Gibb concentrate.
A gallon of water has 3,785 ml in it, so divide this by the 391 ml of water to
obtain 9.68 ml concentrate per full gallon of water. 9.68 ml is approximately
2 teaspoons (see table above, opposite 100 ppm). This type of figuring can be
used with any concentration of liquid Gibberellic Acid (simply multiply the
percentage concentration by 10,000, etc.).

For increased effect, repeat the application of 100 ppm of gibberellic
acid one week after the first application. This results in larger berries and
softening of any gritty seed remnants in the berries. Do not exceed the
amounts shown as limits on the product label.




Leesburg CFREC Research Report LBG 90-14


COLLEGE OF AGRICULTURE


AGRICULTURAL EXPERIMENT STATION


COOPERATIVE EXTENSION SERVICE


SCHOOL OF FOREST RESOURCES AND CONSERVATION


CENTER FOR TROPICAL AGRICULTURE


The Institute of Food and Agricultural Sciences Is an Equal Employment Opportunity Affirmative Action Employer authorized to provide research, educational
Information and other services only to individuals and Institutions that function without regard to race, color, sex, age, handicap or national origin.


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