Title: Some characteristics of commercial frozen orange juice concentrates processed during the ... citrus seasons
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Permanent Link: http://ufdc.ufl.edu/UF00066146/00003
 Material Information
Title: Some characteristics of commercial frozen orange juice concentrates processed during the ... citrus seasons
Series Title: Citrus Station Mimeo report
Physical Description: v. : ; 28 cm.
Language: English
Creator: Citrus Experiment Station (Lake Alfred, Fla.)
Florida Citrus Commission
Publisher: Citrus Experiment Station :
Florida Citrus Commission.
Place of Publication: Lake Alfred Fla
Publication Date: 1961-1962-1963-1964
Frequency: annual
regular
 Subjects
Subject: Frozen concentrated orange juice -- Periodicals -- Florida   ( lcsh )
Frozen concentrated orange juice industry -- Periodicals -- Florida   ( lcsh )
Taste -- Periodicals   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
 Notes
Summary: Covers the previous three growing seasons.
Issuing Body: Issued by the Florida Citrus Commission and the Florida Citrus Experiement Station.
General Note: Description based on: 1962; title from caption.
General Note: Latest issue consulted: 1967.
 Record Information
Bibliographic ID: UF00066146
Volume ID: VID00003
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 - 71311969
lccn - 2006229394
 Related Items

Full Text
5, D


Citrus Station Mimeo Report CES 65-10
October 6, 1964


Some Characteristics of Commercial Frozen Concentrated Orange Juices Processed
during the 1961-62, 1962-63, and 1963-64 Citrus Seasons

M. D. Maraulja and R. W. Barron
Florida Citrus Commission
and
R. W. Olsen
University of Florida
Citrus Experiment Station
Lake Alfred, Florida


During the 1963-64 citrus season, a total of 164 samples of commercial
frozen concentrated orange juice were examined for flavor, stability and
color. Sample collections were made semi-monthly from 22 commercial plants
during the period from December 15, 1963 to June 15, 1964, inclusively.
Seventy-six of the samples analyzed were from midseason packs and 88 were
from late season packs. The results of all analyses are summarized and pre-
sented in Tables 1-8, together with those for samples collected and analyzed
during the two previous seasons, 1961-62 and 1962-63. Severe freezing
weather, causing extensive tree and fruit damage, occurred during the latter
season. Results for both the midseason and late season samples are shown in
all of the tables so that any differences in products packed during these two
periods will be evident.

Flavor evaluations are shown in Tables 1 and 2. These were compiled from
the opinions of flavor panel members after each of the reconstituted juices
had been tasted in accordance with instructions given on the next page. The
samples were stored at 400F. and the degree of clarification and gelation
that occurred after storage is listed in Table 3, together with similar data
for the 1961-62 and 1962-63 seasons. The effect of storage at 800F. was not
determined as had been done in previous years. Frequency distribution tables
(Tables 4, 5, and 6) may be used to compare Hunter Color Difference Meter
"Rd", "a", and "b" values of concentrates and reconstituted juices produced
during the 3 seasons. Increases in lightness (whiteness), redness, or yellow-
ness of the reconstituted juices are indicated by corresponding increases in
the "Rd", "a", or "b" Hunter values, respectively. The relation between date
of packing and the average Hunter color values is shown by data presented in
Tables 7 and 8 for both orange concentrates and reconstituted juices. Each of
the seasons was divided into midseason and late season packing periods chiefly
on the basis of the distinct color change in the concentrates as Valencia
oranges became available in quantity for processing; also, partially on the
number of samples available, which indicated the number of plants in operation.
The average Hunter "a" values, as shown in Table 7, indicate a definite in-
crease in redness of the concentrates obtained after March 15 during the
1961-62 season, and after February 15 for both the 1962-63 and 1963-64 seasons.

Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM











INSTRUCTIONS TO TASTE PANEL


Flavor Evaluation of Frozen Concentrated Orange Juices


Reconstituted commercial frozen 420 Brix orange
concentrates.


Directions:


(a) Grade for flavor on the following basis and do
not consider other factors, such as color or separation.


Excellent
Very good
Good
Fair


10
9
8-7
6-5


Poor I
Very poor
Unpalatable


Use excellent, good, or fair only if the juice in your
opinion is acceptable as frozen orange concentrate, and
therefore, would be repurchased by you.


(b) If you score a sample of juice 4 or lower, indicat-
ing that the product is not acceptable as frozen orange
concentrate, and therefore, would not be repurchased by
you, then indicate all of the flavor defects responsible
for the poor flavor quality.

Indicate flavor defects using only the following descript-
ive terms. If necessary, other terms will be added to
this list. If you are not sure of the type of flavor de-
fect in any juice, which you score 4 or lower, then
indicate that it is nondescript.


Flavor Defects


Too sour (acid)
Too sweet
Excessive peel oil
Too bitter
Too astringent


Heated
Buttermilk
Cardboard
Castor oil
Tallowy


Immature fruit
Overmature fruit
Stale fruit
Insipid


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500 10/6/64 MDM


Samples:









The frequency distributions of the flavor grades (Table 1) for the 3
seasons show the 1963-64 midseason packs to be somewhat better in flavor
than those packed following the severe December freeze in 1962. Twenty-
eight percent of the midseason samples for 1963-64 had "good" flavor,
whereas only 12% were graded "good" in 1962-63. The 1961-62 midseason
samples had the best flavor since 72% were graded "good". Late season packs
produced in both non-freeze years, 1963-64 and 1961-62, were decidedly better
in flavor quality than those packed during the 1962-63 season. The percent-
age of all of the late season samples for the 1961-62, 1962-63, and 1963-64
seasons that were graded "very good" was 25%, 0%, and 40%, respectively; the
percentage graded "good" for these three seasons was 60%, 44%, and 40%; and
the percentage graded "poor" was 3%, 1%, and 1%. Bitterness and astringency
caused only one of the 88 late season samples, obtained during the 1963-64
season, to be graded "poor".

Flavor retention, after abuse by storage for 96 hr. at 400F., was better
in samples of frozen concentrated orange juice packed during the 1963-64 and
1961-62 seasons than that in products from 1962-63. The percentage of all
samples for the 1961-62, 1962-63, and 1963-64 seasons that were graded either
"good" or "fair" was 97%, 74%, and 93%, respectively, and the percentage
graded "poor" was 3%, 26%, and 7% for these 3 seasons. The 1963-64 orange
concentrates that were poor in flavor after abuse tasted bitter, astringent,
heated or fermented.

It is evident from the data shown in Table 3 that the stability of samples
of frozen orange concentrate processed during the past 3 seasons has been
good. No clarification was found in any of the 1962-63 samples after storage
for 96 hr. at 400F. Definite and extreme clarification occurred in only 3.0%
of the 1963-64 concentrates as compared to 6.6% of the 1961-62 products. No
semi-gels formed when the 1962-63 samples were abused and such gels were found
in only 0.6% and 1.5% of the concentrates packed during the 1963-64 and 1961-62
seasons.

Differences in the color characteristics of the reconstituted juices for
the past three citrus seasons are evident from the Hunter Color Difference
Meter values shown in Tables 4-8. A decrease in lightness (whiteness), re-
sulting in a smaller Hunter "Rd" value, in orange juices results in better
color and increases in the redness and yellowness, as indicated by larger
Hunter "a" and "b" values, also improves the color. Data presented in
Tables 4-8 indicate that the lightness of the 1963-64 and 1961-62 reconsti-
tuted orange juices was less than that in the 1962-63 juices. However, both
the redness and yellowness in the 1962-63 juices was greater than that in the
juices from either the 1961-62 or the 1963-64 seasons.







Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM










Acknowledgments

The 527 samples of Florida frozen concentrate orange juices examined during
the past 3 citrus seasons were supplied by 22 companies and their cooperation
was appreciated.

Thanks are extended to the personnel of the U.S.D.A. Agricultural Marketing
Service, Winter Haven, Florida, for their time, efforts, and assistance in ob-
taining samples from the concentrate plants.

Members of the taste panel during the 1963-64 season were M. D. Maraulja,
R. W. Olsen, Roger Patrick, E. C. Hill, M. H. Dougherty, R. W. Barron, S. K.
Long, Louise Cherry, Gusta Livingston, G. E. Alberding, and F. W. Wenzel. The
taste panel members graded the flavor of the reconstituted frozen concentrated
orange juices and thus made possible the flavor evaluations summarized in this
report. Their help, opinions, and willingness to be on the taste panel was
appreciated very much.


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM










Table 1. Frequency distribution of flavor grades for samples of commercial
frozen concentrated orange juices collected from Florida processing plants


Midseason packs1


Very good
Good
Fair
Poor
Totals


Late season packs1
Very good 24 25 0 0 35 40
Good 58 60 38 44 35 40
Fair 12 12 48 55 17 19
Poor 3 3 1 1 1 1
Totals 97 100 87 100 88 100

Total packs for entire season
Very good 24 12 0 0 36 22
Good 131 66 47 28 56 34
Fair 37 19 105 64 71 43
Poor 6 3 13 8 1 1
Totals 198 100 165 100 164 100
Samples collected semi-monthly from December through June, inclusively,
during each processing season. Samples of midseason packs collected from December
1 to March 15, inclusively, for the 1961-62 season; from December 1 to February 15,
inclusively, for the 1962-63 season; and from December 1 to February 15, inclusively,
for the 1963-64 season.
2 Based on the evaluation of the flavor of 198 samples for the 1961-62 season, 165
samples for the 1962-63 season, and 164 samples for the 1963-64 season. The taste
panel followed instructions as previously indicated. Each of the reconstituted
juices from the concentrates for the 1961-62 and 1962-63 seasons was tasted at 3
different times. Those for the 1963-64 season were tasted twice. The data for
the 1961-62 season are based on 4751 individual flavor grades; for the 1962-63
season on 4577 grades; and for the 1963-64 season on 2141 grades.




Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM


0
73
25
3
101


0
72
25
3
100


0
9
57
12
78


0
12
73
15
100


1
21
54
0
76


1
28
71
0
100










Table 2.
at 400F. for
from Florida


Frequency distribution of flavor grades after storage for 96 hr.
samples of commercial frozen concentrated orange juices collected
processing plants1


Flavor grade 1961-62 1962-63 1963-64
after 96 hr. Number of % of Number of % of Number of % of
at 400F.2 samples samples samples samples samples samples

Midseason packs1
Good 1 1 0 0 1 1
Fair 97 96 43 55 68 90
Poor 3 3 35 45 7 9

Totals 101 100 78 100 76 100

Late season packs1
Good 31 32 2 2 28 32
Fair 64 66 77 89 55 62
Poor 2 2 8 9 5 6

Totals 97 100 87 100 88 100

Total packs for entire season
Good 32 16 2 1 29 18
Fair 161 81 120 73 123 75
Poor 5 3 43 26 12 7

Totals 198 100 165 100 164 100

Samples collected semi-monthly from December through June, inclusively, during
each processing season. Samples of midseason packs collected from December 1
to March 15, inclusively, for the 1961-62 season; from December 1 to February 15,
inclusively, for both the 1962-63 and 1963-64 seasons.

2
Based on the evaluation of the flavor of 198 samples for the 1961-62 season,
165 samples for the 1962-63 season, and 164 samples for the 1963-64 season.
The reconstituted juices from the concentrates were tasted by F. W. Wenzel,
M. D. Maraulja and R. W. Olsen.


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM







Table 3. Comparison of frequency distribution tables for degree of clarification and gelatin,


after storage at
treated orange jui


400F., in samples from midseason and late season packs of commercial frozen concen-
ces collected semi-monthly during the 1961-62, 1962-63 and 1963-64 citrus seasons


Degree of Midseason Late season Total
clarification1 samples-% samples-% samples-%
Season 61-62 62-63 63-64 61-62 62-63 63-64 61-62 62-63 63-64
Samples 101 78 76 97 87 88 198 165 164
None 86.6 100.0 96.1 93.6 100.0 94.3 89.9 100.0 95.2
Slight 3.8 0.0 1.3 3.2 0.0 2.3 3.5 0.0 1.8
Definite 8.6 0.0 2.6 3.2 0.0 2.3 6.1 0.0 2.4
Extreme 1.0 0.0 0.0 0.0 0.0 1.1 0.5 0.0 0.6


Degree of
gelation

0-None 71.4 88.5 81.6 74.2 85.1 84.1 72.8 86.7 83.0
1-Very slight 23.8 11.5 17.1 23.6 12.6 11.4 23.7 12.1 14.0
2-Slight 1.9 0.0 1.3 2.2 2.3 3.4 2.0 1.2 2.4
3-Semi-gel 2.9 0.0 0.0 0.0 0.0 1.1 1.5 0.0 0.6
4-Solid gel 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Clarification measured by percentage light transmittance of centrifuged reconstituted juice using
Lumetron 402-E with 730 filter and 14 ml. cell. None = 0-59%; Slight = 60-69%; Definite = 70-84%;
and Extreme = 85-100%.


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM





Table 4. Comparison of frequency distribution tables of Hunter "Rd" values for samples from midseason and
late season packs of commercial frozen concentrated orange juices collected semi-monthly during the 1961-62,
1962-63 and 1963-64 citrus seasons
Hunter Concentrates
Color Midseason Late season Total
Difference ____samples-% samples- _samples-_
Meter Season 1961-62 1962-63 1963-64 1961-61 1962-63 1963-64 1961-62 1962-63 1963-64
Rd Samples 101 78 76 97 87 88 198 165 164
17.0-17.9 -- -- -- -- -- 1.1 -- -- 0.6
18.0-18.9 - -- -- 3.2 -- 3.4 1.5 1.8
19.0-19.9 - - - 6.5 3.4 6.8 3.0 1.8 3.7
20.0-20.9 - 1.3 1.3 22.6 4.6 22.7 1'0.6 3.0 12.8
21.0-21.9 1.0 1.3 10.5 25.8 19.5 18.2 12.7 10.9 14.6
22.0-22.9 6.6 6.4 17.1 17.2 27.6 20.5 11.6 17.6 18.9
23.0-23.9 16.2 10.2 23.7 14.0 13.9 12.5 15.1 12.1 17.7
24.0-24.9 16.2 23.1 30.3 4.3 13.9 8.0 10.6 18.3 18.3
25.0-25.9 18.0 23.1 9.2 3.2 5.7 3.4 11.1 14.0 6.1
26.0-26.9 22.8 17.9 5.3 1.1 6.9 3.4 12.7 12.1 4.3
27.0-27.9 10.5 9.0 2.6 - 1.1 - 5.6 4.8 1.2
28.0-28.9 4.7 6.4 -- - 2.3 - 2.5 4.2 --
29.0-29.9 1.0 - 2.1 1.1 1.5 0.6
30.0-30.9 1.0 1.3 - -- -- -- 0.5 0.6
31.0-31.9 2.0 - -- -- -- 1.0 --
Reconstituted .juices
18.0-18.9 -- -- -- -- -- 1.1 -- -- 0.6
19.0-19.9 -- - 3.2 11.4 1.5 -6.1
20.0-20.9 - - 1.3 12.9 - 13.6 6.0 - 7.9
21.0-21.9 1.9 - 7.9 33.4 1.1 29.6 16.7 0.6 19.5
22.0-22.9 7.6 1.3 31.7 29.0 4.6 28.4 17.6 3.0 29.9
23.0-23.9 21.9 1.3 19.7 16.1 18.4 12.5 19.3 10.3 15.9
24.0-24.9 33.3 6.4 27.6 3.2 34.5 3.4 19.3 21.3 14.6
25.0-25.9 21.9 19.2 9.2 2.2 20.7 - 12.6 20.0 4.3
26.0-26.9 11.4 30.8 2.6 - 11.5 - 6.0 20.6 1.2
27.0-27.9 1.0 26.9 - - 8.1 - 0.5 17.0
28.0-28.9 1.0 6.4 -- -- 1.1 0.5 3.6
29.0-29.9 7.7 - -- 3.6


Florada Citrus Experiment Station
nd Forid- Crun Commission,
ae Are orida.
500- 10/564 MDM





Table 5. Comparison of frequency distribution tables of Hunter "a" values for samples from midseason and
late season packs of commercial frozen concentrated orange juices collected semi-monthly during the 1961-62,
1962-63 and 1963-64 citrus seasons
Hunter Concentrates
Color Midseason Late season Total
Difference samples-% samples-% samples-%
Meter Season 1961-62 1962-63 1963-64 1961-62 1962-63 1963-64 1961-62 1962-63 1963-64
a Samples 101 78 76 97 87 88 198 165 164
11.1-12.0 -- -- -- -- -- -- -- -- -
10.1-11.0 -- -- -- -- -- -- -- -- --
9.1-10.0 -- -- -- -- -- -- -- -- --
8.1- 9.0 - -- -- -- 1.1 8.0 0.6 4.3
7.1- 8.0 1.0 3.8 - 3.2 19.5 22.7 2.0 12.1 12.2
6.1- 7.0 - 6.4 3.9 29.0 38.0 39.8 13.6 23.0 23.2
5.1- 6.0 6.7 16.7 3.9 47.3 29.9 19.3 25.8 23.6 12.2
4.1- 5.0 12.4 35.9 23.7 18.3 8.1 6.8 15.2 21.3 14.6
3.1- 4.0 32.4 24.4 21.1 2.2 2.3 3.4 18.2 12.7 11.6
2.1- 3.0 37.0 11.5 31.6 - 1.1 - 19.7 6.1 14.6
1.1- 2.0 8.6 1.3 14.5 -- -- -- 4.5 0.6 6.7
Less than 1.1 1.9 -- 1.3 - -- -- 1.0 -- 0.6

Reconstituted juices
0.0 to -0.9 -- -- -- -- -- -- -- -- --
-1.0 to -1.9 - - - - 2.3 1.1 - 1.2 0.6
-2.0 to -2.9 - -- -- -- 19.6 6.8 -- 10.3 3.7
-3.0 to -3.9 1.9 19.2 1.3 20.4 49.4 42.1 10.6 35.2 23.1
-4.0 to -4.9 4.8 15.4 10.5 49.4 19.6 33.0 25.7 17.6 22.6
-5.0 to -5.9 26.7 44.9 32.9 26.9 6.9 13.6 26.8 24.8 22.6
-6.0 to -6.9 56.1 15.4 39.5 2.2 1.1 3.4 30.8 7.9 20.1
Less than -6.9 10.5 5.1 15.8 1.1 1.1 - 6.1 3.0 7.3


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM





Table 6. Comparison of frequency distribution tables of Hunter "b" values for samples from midseason and
late season packs of commercial frozen concentrated orange juices collected semi-monthly during the 1961-62,
1962-63 and 1963-64 citrus seasons
Hunter Concentrates
Color Midseason Late season Total
Difference samples-% samples-% samples-%
Meter Season 1961-62 1962-63 1963-64 1961-62 1962-63 1963-64 1961-62 1962-63 1963-64
b Samples 101 78 76 97 87 88 198 165 164
More than 35.9 3.8 - -- -- 10.3 - 2.0 5.4 --
35.0-35.9 10.5 1.3 3.9 - 17.2 8.0 5.6 9.7 6.1
34.0-34.9 29.5 20.5 5.3 - 16.1 12.5 15.7 18.2 9.1
33.0-33.9 31.4 33.3 51.3 2.2 21.9 37.4 17.6 27.3 44.0
32.0-32.9 18.1 38.5 31.6 6.5 18.4 33.0 12.6 27.9 32.3
31.0-31.9 4.8 6.4 6.6 29.0 15.0 6.8 16.2 10.9 6.7
30.0-30.9 1.9 - - 49.4 1.1 2.3 24.2 0.6 1.2
29.0-29.9 - 1.3 12.9 - -- 6.1 - 0.6

Reconstituted juices
More than 33.9 -- -- -- -- 4.6 - -- 2.4 --
33.0-33.9 1.3 - -- 19.5 - -- 10.9 --
32.0-32.9 5.1 - -- 20.7 - - 13.3 --
31.0-31.9 3.8 29.5 1.3 - 21.9 15.9 2.0 25.5 9.1
30.0-30.9 22.9 34.6 22.4 2.2 20.7 40.9 13.1 27.3 32.3
29.0-29.9 33.3 28.2 36.8 9.7 12.6 33.0 22.2 20.0 34.8
28.0-28.9 31.4 1.3 30.3 65.5 - 9.1 47.5 0.6 18.9
27.0-27.9 7.6 - 6.6 22.6 - 1.1 14.7 - 3.7
26.0-26.9 - -- 2.6 - -- -- -- -- 1.2
25.0-25.9 1.0 - -- -- -- -- 0.5 -- -


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM








Table 7. Relationship of
juices collected from Florida


date of packing to average Hunter color values for commercial frozen concentrated orange
processing plants1


SSamples collected semi-monthly from


December through June, inclusively, during each processing season


Hunter Color Difference Meter average values for concentrates
1961-62 season 198 samples 1962-63 season 165 samples 1963-64 season 164 samples
Approx. Number Number Number
date of Rd a b of Rd a b of Rd a b
packed samples samples samples
12/1 1 23.7 4.4 33.3 1 21.4 7.2 31.8 - -
12/15 11 25.3 4.0 33.5 14 25.5 3.8 33.3 13 23.0 3.1 32.5
1/1 17 25.4 3.3 33.6 18 25.3 4.0 33.0 16 24.0 2.6 33.0
1/15 21 25.7 2.7 32.3 18 25.4 4.6 33.3 18 24.0 3.2 33.3
2/1 18 25.8 3.2 34.4 18 25.2 4.9 33.0 19 24.0 4.0 33.4
2/15 20 25.5 3.4 34.0 9 26.1 5.0 33.7 10 23.4 4.1 32.9
3/1 10 26.3 3.0 32.7 9 24.3 5.4 32.8 4 22.8 6.1 33.7
3/15 3 25.0 3.2 32.0 12 23.7 5.8 34.5 3 21.3 6.9 33.4
4/1 4 23.7 4.6 32.0 17 22.9 6.3 35.0 13 23.4 5.1 33.9
4/15 15 22.3 5.1 31.3 16 23.1 6.4 35.1 19 21.9 6.3 33.2
5/1 21 22.7 5.0 30.8 19 23.2 6.3 32.6 18 21.7 6.7 33.3
5/15 20 21.5 5.8 30.8 11 23.1 6.6 32.8 16 21.4 6.9 33.0
6/1 21 21.7 6.0 30.5 2 20.7 7.4 31.8 12 21.4 7.4 32.7
6/15 16 21.4 6.1 31.0 1 22.2 7.2 32.6 3 22.1 7.7 33.3
,t


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM










Table 8. Relationship of date of packing to average Hunter color values for commercial frozen concentrated orange
juices collected from Florida processing plants1

Hunter Color Difference Meter average values for reconstituted juices
1961-62 season 198 samples 1962-63 165 samples 1963-64 season 164 samples
Approx. Number Number Number
date of Rd a b of Rd a b of Rd a b
packed samples samples samples
12/1 1 23.7 -5.1 30.0 1 23.6 -3.5 30.0 -- -
12/15 11 24.1 -5.2 28.9 14 26.1 -5.8 30.1 13 22.6 -6.1 28.3
1/1 17 24.4 -6.0 29.1 18 27.0 -5.4 30.6 16 24.0 -6.4 29.3
1/15 21 24.9 -6.4 28.0 18 27.0 -4.7 31.0 18 24.1 -5.9 30.0
2/1 18 24.9 -6.3 31.2 18 26.4 -5.3 30.2 19 23.3 -5.9 29.0
2/15 20 24.4 -6.2 29.4 9 26.6 -4.7 31.0 10 22.8 -6.0 29.1
3/1 10 24.4 -6.8 28.8 9 25.4 -4.4 30.2 4 22.1 -4.3 30.1
3/15 3 22.7 -7.0 27.3 12 25.3 -4.0 32.1 3 21.7 -3.5 31.0
4/1 4 24.0 -5.4 29.6 17 24.6 -3.7 32.4 13 22.9 -4.9 30.2
4/15 15 22.3 -5.2 28.1 16 25.0 -3.3 33.3 19 21.6 -4.4 30.0
5/1 21 22.4 -4.8 28.3 19 24.7 -3.7 30.8 18 21.2 -3.7 30.0
5/15 20 21.9 -4.5 28.3 11 24.8 -3.4 30.9 16 21.2 -3.8 30.0
6/1 21 21.8 -4.2 28.0 2 23.0 -3.2 30.5 12 21.4 -3.4 29.7
6/15 16 22.0 -4.2 28.5 1 24.0 -3.5 30.8 3 21.6 -3.5 30.3


1Samples collected semi-monthly from


December through June, inclusively, during each processing season.


Florida Citrus Experiment Station
and Florida Citrus Commission,
Lake Alfred, Florida.
500-10/6/64 MDM




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