| Material Information
||Production of high quality plants of Cordyline terminalis 'Baby Doll'
||2, 1 leaves : ; 28 cm.
||Conover, Charles Albert, 1934-
Poole, R. T ( Richard Turk )
Agricultural Research Center (Apopka, Fla.)
||University of Florida, IFAS, Agricultural Research Center
||Place of Publication:
||Ti (Plant) -- Growth -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||by C.A. Conover and R.T. Poole.
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 71194395
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Production of High Quality Plants of
Cordyline terminalis 'Baby Doll'
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 .
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
propagation medium and (4) rooting with deionized water. Of these four
methods, only plants rooted with deionized water were consistently of
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
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
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).