Group Title: CFREC-Apopka research report
Title: Effects of fertilization rate on Draceana deremensis 'Warneckii' growth and electrical conductivity of the medium leachate
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Permanent Link: http://ufdc.ufl.edu/UF00065309/00001
 Material Information
Title: Effects of fertilization rate on Draceana deremensis 'Warneckii' growth and electrical conductivity of the medium leachate
Series Title: CFREC-Apopka research report
Physical Description: 5 p. : ; 28 cm.
Language: English
Creator: Conover, Charles Albert, 1934-
Poole, R. T ( Richard Turk )
Central Florida Research and Education Center--Apopka
Publisher: University of Florida, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1991
 Subjects
Subject: Plants, Ornamental -- Growth -- Florida   ( lcsh )
Plants, Ornamental -- Fertilizers -- Florida   ( lcsh )
Soils -- Leaching -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 3).
Statement of Responsibility: C.A. Conover and R.T. Poole .
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065309
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 - 70069609

Full Text



Effects of Fertilization Rate on Draceana deremensis 'Warneckii' Growth and Electrical
Conductivity of the Medium Leachate

C.A. Conover and R.T. Poole1

University of Florida, IFAS,
rPntral Flnridn Rp-pnarch and Prlnrtinn rPntpr Annnina







cuttings were potted in 8 inch plastic containers, 3 per pot, using a growing medium of
Florida peat:pine bark:sand in a ratio of 6:3:1 v/v, amended with 7 lbs dolomite and 1 lb
Micromax /yd3 (Micronutrient manufactured by Grace/Sierra Co., Milpitas, CA 95035).
After potting, plants were placed in a shadehouse covered with 73% propylene shadecloth, so
that they received a maximum of 2000 ft-c in winter and 3500 ft-c in summer. Production
temperatures ranged from 45 to 950F, depending on time of year and plants were watered 4
times per week using overhead irrigation. Osmocote 19-6-12 (Grace-Sierra Co., Milpitas,
CA 95035) was applied to medium surface of each pot on 15 October 1990, 15 March and
21 May 1991 at rates of 4.3, 8.6, 12.9, 17.2, 21.5, 25.8, 30.1, 34.4, 38.7 or 43.0 g/8 inch
pot. These rates are equivalent to 20, 40, 60, 80, 100, 120, 140, 160, 180 or 200 lbs N/1000
ft2/yr.

After fertilizer applications started, electrical conductivity (M/mhos/cm) and pH of the
medium leachate from pots growing D. 'Warneckii' were determined monthly, using the
pour-through method. Deionized water was applied to medium surface until about 50 ml was
collected in a beaker placed under the pot. The amount of SS dissolved in the collected
water (leachate) was measured with a conductance meter (YSI model 35, Yellow Springs
Instrument Co. Inc., Yellow Springs, OH 45387). Leachate pH was measured using a
selective ion analyzer (Fisher Accumet model 750, Fisher Scientific Co., Pittsburgh, PA
95219). Plant height was measured initially and at three month intervals. Plants were
graded when research was completed, based on a scale of 1 = poor quality, unsalable, 3 =
fair quality, salable and 5 = excellent quality plants. Research was concluded on 21 June
1991.

There was a dramatic increase in growth and quality when D. 'Warneckii' plants were
fertilized at the rate of 8.6 g/8 inch pot compared to 4.3 g 19-6-12/8 inch pot, the lowest
rate tested (Table 1). Height increased slowly as fertilization level increased from 12.9 to
38.7 g/19-6-12/8 inch pot. However, the higher fertilizer levels tested, 21.5 to 43.0 g 19-6-
12/8 inch pot, did not produce better quality plants than the 17.2 g 19-6-12/8 inch pot rate.

The electrical conductivity (pmhos/cm) of the medium leachate from pots containing
test plants generally increased as fertilization rate increased (Table 2). However, the
leachate electrical conductivity readings obtained in this experiment were well within the
general range recommended for good foliage plant production. The pH of the leachate
generally decreased as fertilization levels increased.

The recommended 19-6-12 Osmocote application rate for production of acclimatized
Draceana deremensis cultivars grown in 8 inch containers is 7.2 g/pot/3 months. This rate
was determined based on research evaluating plants adaptability to indoor conditions.
Optimum fertilizer rates for acclimatized potted foliage production are those that produce
good quality plants with root systems large enough to support top growth when plants are
placed indoors. Over fertilized plants may not show signs of SS injury during production;
however, these plants will have smaller root systems, making them less able to adjust to
indoor conditions.






ilnnt~ in this e~xnerime~nt fP~rtili7eA1 with R 6 i0IR inch nnt clnr tn thp r21P


recommended for the production acclimatized Draceana deremensis cultivars, had leachate
conductivity readings ranging from 144 to 189 /Lmhos/cm. Plants grown at several of the
fertilization levels tested received the same high plant grade. The lowest fertilization rate
producing the highest graded plants was 12.9 g/8 inch pot. The electrical conductivity of
leachate from pots fertilized at the 12.9 g/8 inch pot rate ranged from 202 to 247 tmhos/cr



Additional Reading

1. Conover, C.A. and R.T. Poole. 1990. Light and fertilizer recommendations for
production of acclimatized potted foliage plants. Nursery Digest 24(10):34-36.

2. Conover, C.A., R.T. Poole and R.W. Henley. 1975. Growing acclimatized foliage
plants. Florida Foliage Grower 12(9):1-7.

3. Poole, R.T. 1981. Soluble salts interpretation. Foliage Digest 4(6):11-13.

4. Poole, R.T., C.A. Conover and A.R. Chase. 1985. Soluble salts interpretation for
ornamental crop production. Proc. Trop. Reg. Amer. Soc. Hort. Sci. 27:33.

5. Poole, R.T. and A.R. Chase. 1987. Response of foliage plants to fertilizer
application rates and associated leachate conductivity.

6. Wright, R.D. 1986. The pour-through nutrient extraction procedure. HortScience
21:227-229.







Plant grade and height (cm) of Draceana deremensis 'Warneckii'
Osmocote at 10 fertilization rates. 20 August 1990 until 21 June


receiving 19-6-12
1991.


Plant Height (cm) Plant Gradez
g 19-6-12/
8" poty 20 Oct 1990 3 Apr 1991 27 Jun 1991 21 Jun 1991
4.3 14 43 49 3.1
8.6 20 50 61 4.4
12.9 18 51 64 4.7
17.2 18 52 66 4.9
21.5 15 52 68 4.8
25.8 19 51 66 4.7
30.1 16 53 69 4.9
34.4 22 53 69 4.9
38.7 19 52 71 4.9
43.0 23 52 68 4.8
Significance
linear ns ** ** **
quadratic ns ** ** **

Plants were graded on a scale of 1 = poor quality, unsalable, 3 = fair quality, salable and 5 =
excellent quality plants.
Y19-6-12 Osmocote 3 month release rate fertilizer (Grace-Sierra Co., Milpitas, CA 30905) was
applied to medium surface on 15 October 1990, 15 March and 21 May 1991. Application rates
were equal to 20, 40, 60, 80, 100, 120, 140, 160, 180 or 200 N/1000 ft2/yr).
Xns, **; Nonsignificant and significant at P = 0.01 respectively.


Table 1.







Electrical conductivity (Cmhos/cm) and pH of leachate from pots c
jeremensis 'Warneckii' grown from 20 August 1990 until 21 June


containing Dracean
1991


29 Nov 1990 1 Feb 1991 2 Apr 1991 12 Jun 199
g 19-6-12/
8" pot'z 1mhos/cm pH /mhos/cm pH /mhos/cm pH 1mhos/cm
4.3 127 6.9 161 7.6 199 7.4 191
8.6 144 7.2 189 7.8 184 7.5 184
12.9 202 7.2 247 7.8 222 7.5 229
17.2 298 7.2 221 7.8 240 7.5 240
21.5 332 7.3 264 7.8 418 7.5 216
25.8 444 7.1 251 7.8 487 7.3 297
30.1 636 7.0 395 7.5 516 7.3 286
34.4 589 6.9 307 7.6 460 7.2 317
38.7 794 6.8 398 7.6 776 7.0 268
43.0 547 6.6 434 7.4 601 6.9 270
SignificanceY
linear ** ns ** ** ** ** **
quadratic ns ** ns ns ns ns

Z19-6-12 Osmocote 3 month release rate fertilizer (Grace-Sierra Co., Milpitas, CA 30905) was applied
medium surface on 15 October 1990, 15 March and 21 May 1991. Application rates were equal to 2
40, 60, 80, 100, 120, 140, 160, 180 or 200 N/1000 ft2/yr).
Yns, *, **; Nonsignificant, significant at P = 0.05 and P = 0.01 respectively.


Tahip 7




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