Group Title: CFREC-Apopka research report - Central Florida Research and Education Center-Apopka ; RH-90-5
Title: Response of African violets to fertilizer source and rate
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Permanent Link: http://ufdc.ufl.edu/UF00065870/00001
 Material Information
Title: Response of African violets to fertilizer source and rate
Series Title: CFREC-Apopka research report
Physical Description: 3 p. : ; 28 cm.
Language: English
Creator: Poole, R. T ( Richard Turk )
Conover, Charles Albert, 1934-
Ozeri, Y
Central Florida Research and Education Center--Apopka
Publisher: University of Florida, IFAS, Central Florida Research and Education Center-Apopka
Place of Publication: Apopka FL
Publication Date: 1990
 Subjects
Subject: African violets -- Fertilizers -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 2).
Statement of Responsibility: R.T. Poole, C.A. Conover, and Y. Ozeri.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00065870
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 70550863

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Response of African Violets to Fertilizer Source and Rate ,
R. T. Poole, C. A. Conover, and Y. Ozeri'
University of Florida, IFAS "'i 7o
Central Florida Research and Education Center Apopka,
CFREC-Apopka Research Report RH-90-5

Saintpaulia ionantha spp. (African violets) are commonly grown
using capillary mat watering systems. Incorporated slow-release
fertilizer is a recommended method of fertilization when plants are
grown on capillary mats. This experiment examined African violet
response to 3 sources of incorporated slow-release fertilizer and
compared 5 application rates for each of the 3 fertilizers tested.

Fertilizers tested were: (1) Osmocote 13-13-13, an 8 to 9 month
fertilizer; (2) Osmocote 14-14-14, a 3 to 4 month fertilizer; and (3) a
combination of the two materials in a 1:1 ratio by weight. Osmocote is
manufactured by Sierra Chemical Co., Milpitas, CA. Five application
rates compared were 0, 0.32, 0.64, 0.96, and 1.28 grams per 4 inch pot
of incorporated material. Plantlets of 6 African violet cultivars,
California, Crater Lake, Everglades, Glacier, Texas, and Washington,
were potted into 4 inch pots containing Verlite container mix. Verlite
container mix is a peat vermiculite soil mix manufactured by Verlite,
Tampa, FL. All cultivars were tested during two seasons, one warm, one
cool. Plants were grown on capillary mats in a glass greenhouse under a
Maximum of 800 to 1200 ft-c and temperatures of 650F to 950F depending
on season of year. Experimental data recorded for both the cool and
warm season tests after 2 1/2 months included plant grade on a 1-5 scale
(l=poor quality, 5=excellent quality), number of flowers and leaves,
days to flower, leaf area, and leaf weight.

Source of fertilizer used produced variable results with only 23 of
72 indicators recorded showing significance. Thus, sources of
fertilizer tested do not appear to be an important factor in this
experiment.

Fertilizer application rate did produce significant differences for
most factors evaluated. Because of the similarity of results among
cultivars, only results from Everglades are shown (Table 1). The lowest
rates tested, 0 and 0.32 grams per 4 inch pot almost always produced low
quality plants. The 0.64 grams per 4 inch pot rate sometimes produced
plants as good as those receiving the higher rates but the highest
quality plants received 0.96 or 1.28 grams per 4 inch pot. The higher
1.28 grams per 4 inch pot rate was slightly more beneficial during the
warm season planting but not during cool season production.


1Professor, Plant Physiology and Center Director and Professor,
respectively, Central Florida Research and Education Center, 2807
Binion Road, Apopka, Florida 32703, and Professor, Ornamental
Horticulture, The Volcani Center, Bet Dagan, Israel 50250









Number of days to flower was not affected by fertilizer rate.
Plant grade, number of flowers, number of leaves, leaf area, and leaf
weight increased with increasing fertilizer application rates. (Table
1).

Results of these tests show good quality African violets can be
produced in about 2 1/2 months during the winter or summer using either
the 3 to 4 month or the 8 to 9 month Osmocote at application rates of
0.96 or 1.28 grams per 4 inch pot.

References

1. Andersen, H. 1984. The effects of temperature, frequency of
watering, composition of fertilizer and peat type on Saintpaulia.
Tdisskrift Plant. 88:183-191.

2. Conover, C. A. and R. T. Poole. 1977. Influence of irrigation
method and fertilizer source and level on growth of four foliage
plants. Proc. Fla. State Hort. Soc. 90:312-313.

3. Conover, C. A. and R. T. Poole. 1981. Light acclimatization of
African violet. HortScience 16:92-93.

4. Milde, H. 1980. Saintpaulias, a comparison of slow-release
fertilizers. Vergleich von Langzeitdungung 80:486-488.

5. Payne, R. N. and S. M. Adam. 1980. Influence of rate of placement
of slow-release fertilizer on pot plants of African violet grown
with capillary mat watering. HortScience 15:607-609.

6. Schwemmer, E. 1980. Saintpaulia ionantha in hydroculture.
Deutscher Gartenbau 34:1046-1047.


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Table 1.
rate.


Response of African violet Everglades" to fertilizer source and


Plant No. Days to No. Leaf Leaf
Treatment gradeY flowers flower leaves A (in2) wt (oz)

Planted Mar 22x
Fertilizer source
13-13-13 3.2 44 48 19 59.5 1.2
14-14-14 3.5 47 50 22 61.2 1.2
1 & 2, 1:1 3.6 46 50 22 59.8 1.2

Fertilizer rate
(g/per 4 in pot)
0 2.2 16 51 18 37.6 0.84
0.32 2.7 29 51 18 51.7 1.0
0.64 3.9 55 48 21 67.5 1.4
0.96 4.7 73 48 23 83.3 1.6
1.28 3.7 54 48 24 60.4 1.1

Planted July 10w
Fertilizer source
13-13-13 8 to 9 mo 2.9 68 54 22 64.9 1.2
14-14-14 3 to 4 mo 3.4 82 46 20 74.8 1.3
1 & 2, 1:1 3.6 80 58 20 76.4 1.4

Fertilizer rate
(g/per 4 in pot)
0 1.8 29 54 18 42.4 0.88
0.32 2.4 56 53 20 56.1 1.1
0.64 3.4 85 54 19 77.9 1.4
0.96 4.0 98 53 22 87.7 1.5
1.28 4.8 115 50 24 96.1 1.7


zSimilar data was also obtained for tl
Glacier, Texas, and Washington.
Y1=poor quality, 5-excellent quality.
xData taken June 8.
WData taken Sept. 21.


he cultivars, California, Crater Lake,


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