Group Title: ARC-A mimeo - Agricultural Research Center-Apopka ; RH-72-5
Title: Production of high quality plants of Cordyline terminalis 'Baby Doll'
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Permanent Link: http://ufdc.ufl.edu/UF00066002/00001
 Material Information
Title: Production of high quality plants of Cordyline terminalis 'Baby Doll'
Series Title: Mimeo
Physical Description: 2, 1 leaves : ; 28 cm.
Language: English
Creator: Conover, Charles Albert, 1934-
Poole, R. T ( Richard Turk )
Agricultural Research Center (Apopka, Fla.)
Publisher: University of Florida, IFAS, Agricultural Research Center
Place of Publication: Apopka Fla
Publication Date: 1972
 Subjects
Subject: Ti (Plant) -- Growth -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: by C.A. Conover and R.T. Poole.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00066002
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 71194395

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Production of High Quality Plants of
Cordyline terminalis 'Baby Doll'

By

C. A. Conover and R. T. Poole
Agricultural Research Center Apopka
Mimeo No. 72-5


Growers of Baby Doll have experienced slight to serious foliar

spotting and necrosis during propagation which affects .
HUME LIBRARY
During the past year, experiments at the Agricultural + search Center -

Apopka, have shown conclusively that soluble fluoride from irfi~tgdq1976

water or superphosphate in the rooting mlediun causes this problem.

Economic losses occur from levels of fluoride in soluti d~ iSdwkLV. of Florida

0.10 ppm (parts per million). Unfortunately, analyses of well water

in the Apopka Plymouth Zellwood area show fluoride levels of 0.18

to 0.43 ppm.

When we started working on this problem at ARC-A the initial

thought was that a disease organism was involved. However, tissue

isolations disproved this hypothesis and subsequent experiments proved

fluoride to be the culprit. Damage to Baby Doll from soluble fluoride

occurs only during propagation and then only during the first 7 to 10

days after sticking. Once roots appear the uptake of toxic levels of

fluoride cease; probably because roots selectively exclude the fluoride

ion from those that move across the root membrane.

Research on prevention of fluoride toxicity to Baby Doll has provided

information on a number of methods of reducing the severity of the injury

and include; (1) rooting in Turface, (a calcined clay), (2) dipping basal

ends of cuttings in melted wax and then sticking, (3) elevating pH of the




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propagation medium and (4) rooting with deionized water. Of these four

methods, only plants rooted with deionized water were consistently of

salable quality.

Our experience with Baby Doll indicates that yield of cuttings from

stock plants under slat shed conditions is sufficiently high as to make

this a profitable item (50 cuttings/sq ft/yr or more). In addition,

disease problems are very low (even under slat shed conditions), and the

standard insect pests; worms, aphids and mites pose no serious problem,

because foliage does not seen to be overly sensitive to standard pesticides.

Therefore, the limiting point in production of Baby Doll is propagation,

and we feel the answer is soine type of water conditioning equipment to

remove the fluoride fro i irrigation water used on Baby Doll propagation

beds. Fe recormnend the following procedures be used in propagation:

1. Install water conditioning equipment on one or more propagation

beds to be used for Baby Doll propagation.

2. Fill the bed with fresh i:nported sphagnuln peat moss a-iended

with 7 Ibs dolomite per cubic yard.

3. Water or mist medium or cuttings only with conditioned water.

Never use any other water on a Baby Doll propagation bed.

Provided the propagation bed is situated in an area with low light

intensity (approximately 2000 foot-candles) and excessive mist is not used,

the water conditioning cost will be less than one-tenth of a cent per rooted

cutting.








Estimating Conditioned T:'ater Costs for
Production of Fluoride Free 'Baby Doll'


Bench Size: 4' x 50'

Number Mist Heads: 17

Mist Sequence: 15 sec each 30 min

Water Use: 125 ml/head/application times 17 mist heads = 2125

:nl/application times 20 applications per day = 42,500

ml converted to gallons = 11 gallons/day/200 sq ft -

S times 14 days per crop = 154 gallons conditioned water

per crop.

Cuttings may be spaced at 2" or 2 1/2" OC, which provides approximately

36 or 24 cuttings per sq ft. To calculate water cost per cutting, multiply

154 gallons times cost per gallon and divide by 4300 (2 1/2" spacing) or

7200 (2" spacing).




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