Group Title: Mimeo Report - University of Florida Everlgades Experiment Station ; EES63-20
Title: Studies on petiole cracking in several celery varieties
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Permanent Link: http://ufdc.ufl.edu/UF00067453/00001
 Material Information
Title: Studies on petiole cracking in several celery varieties
Series Title: Everglades Station Mimeo Report
Physical Description: 4 p. : ; 29 cm.
Language: English
Creator: Burdine, Howard W., 1909-
Guzman, V. L ( Victor Lionel ), 1914-
Everglades Experiment Station
Publisher: Everglades Experiment Station
Place of Publication: Belle Glade Fla
Publication Date: 1963
 Subjects
Subject: Celery -- Diseases and pests -- Florida   ( lcsh )
Celery -- Soils -- Florida   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
Statement of Responsibility: H. W. Burdine and V. L. Guzman.
General Note: "May, 1964."
 Record Information
Bibliographic ID: UF00067453
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 63681477

Full Text





Everglades Station Mimeo Report 63-20


May, 1963


STUDIES ON PETIOLE CRACKING IN SEVERAL CELERY VARIETIES .

H. W. Burdine and V. L. Guzman


In the 1962-63 season celery growers have reported difficulty with rib and
node cracking. Purvis and Ruprecht found in 1937 that cracked stem of celery was
controlled with borax or boron compounds.

In 1956-57 the Emerald celery variety appeared a possibility. When one of
its difficulties seemed to be excessive brittleness that resulted in petiole and
node cracking, several experiments were conducted to determine effects of soil
conditions and foliar treatments on this disorder. As the problem has not been
serious until the 1962-1963 season, these data have not been published before.
The following results were obtained in a series of experiments conducted from
1957-1960.

A. Effects of soil and foliar applied boron.

1. Exp. conducted on Wedgworth Farm, Emerald variety, harvested April 20.

(a) Effect on marketable weight (Ibs/plot)


Basic Soil
treatment
8.8 lbs. Borax/A
17.6 lbs. Borax/A
35.2 lbs. Borax/A
140.8 lbs. Borax/A
Average
Differences were


Without Wi
Supp; B Ap
113.8
111.0
104.0
105.2
108.5
not significant.


th 2 Ibs. Boron/A
plied to foliage
103.3
105.1
112.1
125.9
111.6


With 17.6 lbs./A
Borax sidedress
121.9
110.9
118.0
112.8
115.9


(b) Percent of plants showing cracked petioles.


Basic Soil Without With 2 lbs. Boron/A Wit]
treatment Supp. B Applied to foliage Bori
8.8 lbs. Borax/A 90.9 72.2
17.6 lbs. Borax/A 90.0 74.7
35.2 Ibs. Borax/A 87.9 82.5
140.8 lbs. Borax/A 90.6 78.7
Average 89.6 77.0
Percentage of cracking plants receiving foliar boron were
Soil treatment effects were not significant.


h 17.6 Ibs./A
ax sidedress
87.7
85.7
88.8
85.4
86.9
significantly less.


1 Prepared for presentation at the Annual Vegetable Crops Field Day held at
the Everglades Experiment Station May 9, 1963.

Associate Soils Chemist and Associate Horticulturist, Everglades Experiment
Station, Belle Glade, Florida.


J








(c) Number of cracked petioles on 30 plants.


I..


Z6 9I /


Basic Soil Without Witn 2 IbD. Boron/A w-.1n i.u o L./a
treatment Supp. B Applied to foliage Borax sidedress
8.8 Ibs. Borax/A 123 69 111
17.6 lbs. Borax/A 144 63 114
35.2 lbs. Borax/A 99 72 99
140.8 lbs. Borax/A 90 78 81
Average 114 71 101
The large differences are between foliar applied boron and non-foliar boron.

B. Effects of increasing Nitrogen and potassium levels with and without foliar
boron.

1. Exp. at Dudas, Emerald variety harvested January 1.

(a) Soil test results (after broadcast fertilization)
pH 5.69
40 lbs./A. H20 soluable Phosphorus
267 lbs./A. 0.5 N acetic acid soluable potassium

(b) Treatments N = No supplementary nitrogen, N1 = 200 lbs./N/A
K6 = No additional potassium, K = 200 lbs./K/A


Without
Soil Lbs. trin
Treat. Wt./plot
1. N1 K1 74.0
2. No K1 40.9
3. N1 KO 60.3
4. No KO 39.9
Average 53.8
Nitrogen and f


it foliar boron
med % cracked
plants
40.0
16.0
36.3
13.3


No. cracked


No. cracked
petioles/30 pl.
82
59
83
41


With foliar boron
Lbs. trimmed % cracked No.crack.
wt./plot plants pet./30 p.
62.9 17.3 58


42.4
66.0
35.6


26.4 66 51.7
'oliar boron effects only were significant.


7.6
30.0
2.3
14.3


2. Exp. at Wedgworth's Emerald variety harvested March 19.

a. Soil tests after broadcast fertilization
PH 5.95
P level 27 Ibs/A H20 Soluable Phosphorus
K level 159 lbs./A, 0.5 N acetic acid soluable potassium


.Without foliar boron
Lbs. trimmed % cracked
Wt./plot plants
76.1 84.0


73.6
69.2
70.8
72.4


90.3
85.7
87.0
86.8


No. cracked
pet./30 pl.
-84

138
87
ill
111
105


With foliar boron
Lbs. trimmed % cracked No.cracked
wt./plot plants pet./30 pl.
73.9 59.3 39


77.9
73.0
66.3
72.8


70.7
73.7
56.o
64.8


Soil
treat.
NlK1
N1 K0
No K1
N1 Av
NoK


e.








In this experiment potassium levels without additional nitrogen increased
cracking whereas the addition of nitrogen tended to decrease cracking.

Differences between the effects of supplementary nitrogen and potassium in
this plot and the plot at Duda's is probably due to the fact that the experiment
at Dudas was harvested January 1, and that at Wedgworths on March 19. Tempera-
tures and other soil conditions in the Duda experiment were such as to expect the
predominant effect to be one obtained from the nitrogen treatment. In the Wedge-
worth experiment, harvested I4rch 19 conditions were favorable, for higher levels
of available nitrogen. While supplementary nitrogen effects were relatively small,
basic soil potassium levels were lower, hence the predominant effects of the suppli-
mentary potassium.

C. Effects of pH with and without foliar sprays of boron.
1. Exp. with C. A. Thomas harvested March 15. Two varieties were used,.
Summer Pascal 259-19 and Utah 52-70.
Average pH at harvest
Var.
6.28 5.99 5.74 5.41 Ave.
1. No foliar treatment.
a. Trimmed weight
(1) Summer Pascal 85.7 95.0 88.0 92.3 90.3
(2) Utah 52-70 109.5 111.2 114.9 111.2 111.7
b. No. cracked petioles/30 pl.
(1) Summer Pascal 18 16 16 13 15.6
(2) Utah 52-70 46 25 30 30 32.8
2. With foliar boron
a. Trimmed weight
(1) Summer Pascal 88.4 90.5 85.6 87.9 88.1
(2) Utah 52-70 115.5 112.2 112.9 106.8 111.8
b. No. cracked petioles/30 pl.
(1) Summer Pascal 9 7 4 10 7.5
(2) Utah 52-70 17 22 15 11 16.3
2. Effects of pH on S. N. Knight Farm, harvested May 15. Two varieties,
Utah 52-70 and Emerald were used.
Average pH at harvest Var.
6.24 5.64 5.21 4.b5 Ave.
1. No foliar treatment
a. Lbs./plot trimmed weight
(1) Utah 52-70 96.4 107.2 102.7 94.0 100.6
(2) Emerald 97.9 101.6 93.7 92.8 96.5
b. No. cracked petioles/30 pl.
(1) Utah 52-70 33 30 29 25 29.2
(2) Emerald 59 58 47 39 50.8
2. With foliar boron
a. Lbs./plot trimmed weight
(1) Utah 52-70 103.6 le0.2 103.1 94.2 100.3
(2) Emerald 98.6 95.4 94.6 90.7 94.8
b. Number cracked petioles/30 pl.
(1) Utah 52-70 23 20 17 20 20.0
(2) Emerald 35 29 26 30 29.8








3. Effects of pH on certain varieties without further t:
Conducted with C. A. Thomas, harvested January 18.

Average pH at harvest


6.50 5.94


5.75


treatment.

Var.
5.53 Ave.


1. Trimmed weight/plot
(a) Emerald
b) Utah 52-70
c) Utah 16-11
d) Early fortune
(e) Supreme Golden
Average

2. Number cracked petioles
(a) Emerald
(b) Utah 52-70
(c) Utah 16-11
(d) Early forte
(e) Supreme Golden
Average '


82.1
84.1
97.3
71.5
66.7
80.3

on 30 plants
68
21
.3
2

19.2


Summary


These data indicate:


1. Increasing soil applications of boron above
an effective approach to the problem.


present recommendations are not


2. Fertilization and-season of growth also have an effect on cracking.

3. Foliar applications of boron seem to offer the most practical approach to
the problem with a variety that cracks badly. Rates of foliar boron here
were equivalent to slightly more than 1- Ibs. solubor/100 gal. water applied
in 6 weekly applications the 7th through the 12th week after transplanting.
For some celery varieties beginning late December and continuing through
February heavier applications each of 3 lbs. solubor/100 gal. each may give
even more effective control. There is good observational evidence to
support this. We have experimental evidence, not given here that this
amount can be safely used.

4. pH effects'the tendency of celery varieties to crack. Cracking is more
severe at pH levels above 6.00. Foliar applied boron here decreases the
severity of the cracking.









EES Mimeo Rpt. 63-20
400 copies


83.4
87.0
90.7
76.1
70.8
81.6


58
13
5
2,
2
15.7


87.2
93.5
92.0
66.8
72.9
82.5

60
14-
2
0.5
0.5
15.3


79.5
90.4
97.1
75.3
71.5
82.8


38
8
0.2
2
0.7
9.7


83.0
88.8
94.3
72.4
70.5


55.9
13.6
2.5
1.6
1.1




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