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Group Title: Lettuce evaluation.
Title: Lettuce evaluation, 1980
ALL VOLUMES CITATION THUMBNAILS PAGE IMAGE ZOOMABLE
Full Citation
STANDARD VIEW MARC VIEW
Permanent Link: http://ufdc.ufl.edu/UF00075817/00003
 Material Information
Title: Lettuce evaluation, 1980
Series Title: Lettuce evaluation.
Translated Title: Research report - UF Agricultural Research and Education Center ; CF-80-1 ( English )
Physical Description: Serial
Language: English
Creator: White, J. M.
Publisher: Agricultural Research and Education Center, University of Florida
Publication Date: 1980
 Record Information
Bibliographic ID: UF00075817
Volume ID: VID00003
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 144607792

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HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






Copyright 2005, Board of Trustees, University
of Florida





F(P3Lprfr
CAT Agricultural Research and Education Center
a-"I IFAS, University of Florida
Sanford, Florida

P.enarch Report CF-80-1 J. M. White June 1903

LETTUCE EVALUATION U Lf ..


Three plantings in Lauderhill muck at Zellwood a d three plantings in Myckka
fine sand at Sanford were made to evaluate 11 head le tuce types and four cos orl
Romaine lettuce types. Seeds were supplied by Dr. V. Lt..)Ipadjr.~JC-I 'l11l''Glade,
Florida.

The first planting in Zellwood was hand seeded October 12, 1979, and harvest'
as the cultivars matured from December 26, 1979, to January 2, 1980. A broadcast
application of 13.4 q/ha of a 10-4-10 fertilizer was disked in before beds were
made. An additional application of 6.7 q/ha of a 10-4-10 fertilizer was applied
during the growing season. Beds were on 91 cm centers with the tops of the beds
56 cm wide and 20 cm high. Plots were 1.4 km long with one row on each bed.
Plants were hand thinned to 29 cm apart about three weeks after seeding. A com-
plete randomized block design with 5 replications was used. A summary of the
results is found in Table 1. Six Florida lines and Shawnee performed as well
as or better than the checks, Fairton and Ithaca. Florida 1446 and 9042 were
the best overall head lettuce in this planting. In the cos lettuce, Florida
24069 and 1978 looked the same in the field, but the 1978 had a significantly
lower yield. Parris Island had 44.5% bolts which reduced its yield. The two
Florida cos lines had slightly larger and heavier heads.

The second Zellwood planting was hand seeded December 13, 1979. Cultural
practices and plot design were the same as for the first planting, except an
additional application of 6.7 q/ha of a 5-5-8 fertilizer was applied. The
planting was lost due to colder than normal weather. January had four days of
0OC or lower, February had 8 days of 0OC or lower, and there was a hard freeze
which did the damage to the crops on March 3 and 4 (low of -4.4C).

The third Zellwood planting was hand seeded March 14, 1980, and harvested
as the cultivars matured from May 20 to 22, 1980. Cultural practices and plot
design were the same as for the second planting. A summary of the results is
found in Table 2. Yields were lower mostly due to hot weather the last few
weeks before harvest. On April 5, 1980, standing water was cGbserved over the
plots from a 5.7 cm rain. Five Florida lines yielded as well vs or better
than Shawnee. All lines did much better than Fairton. "olting was a problem
in the cos type, Parris Island. The two Florida lines were cqual or better
than the check, Valmaine. Florida 24069 and 1978 looked the Zame in the field,
with 24069 being slightly larger and having a higher yield.

The first planting in Sanford was hand seeded October 37, 1979, and
harvested from January 2 to 7, 1980, as the cultivars rmatured. The soil was
treated with D-D soil fumigant for nematodes about 5 weeks before planting.
Fertilizer, at the rate of 11.2 q/ha of 5-5-8, was hand applied and raked in
to incorporate in the middle of the bed between the two rows of lettuce. Three
additional applications of fertilizer were applied in the seas way at about two
week intervals. A complete randomized block design with six replications wa3
used. Plots were 0.5 km long by 76 cm wide with two rows per plot. Beds were










on 76 cm centers with the top of the bed 118 cm wide and 10 cm high. Harvest data
are summarized in Table 3. Florida 1446 had the best overall field appearance and
yield in the head types. Most of the Florida lines and Shawnee had higher yields
than the checks. In the cos types, the Florida lines had higher yields, but not
significantly, than Valmaine. The Florida lines also had less bolting. Florida
1978 had less bolting than Florida 24069, which was opposite the results in
Zellwood.

The second Sanford planting was hand seeded December 13, 1979, and harvested
from March 10 to 17, 1980, as the cultivars were mature. Cultural practices and
plot design were the same as for the first Sanford planting. Harvest data are
summarized in Table 4. Injury from the March 3 and 4 freeze reduced yields. The
cold temperatures of February reduced the growth and average head size.

The third Sanford planting was hand seeded March 4, 1980, and harvested on
May 21, 1980. Cultural practices and plot design were the same as for the first
and second Sanford plantings. Harvest data are summarized in Table 5. Due to hot
weather, the plant size was small and few of the heads reached marketable size
before soft rot became a problem (probably Sclerotinia). All of the cos lines
bolted before they reached marketable size. A week after harvest many of the
head lettuce were bolting before they reached marketable size. The cold weather
in March and the hot weather in May were notsuitable for good lettuce growth and
head development.







Table 1. Yield and average head weight of 11 head types and 4 cos types of
lettuce planted on October 12, 1979, Zellwood, Florida.



Marketable Avg. head Percent
Line q/ha wt. (g) Mkt. Bolt Rot

head types
Fla. 1446 258 808 76.4 0 8.5
Fla. 9042 247 717 79.3 0 5.9
Fla. 20053 229 690 75.7 0 9.8
Fla. 7423 221 686 68.9 0 11.5
Shawnee 214 558 83.2 0 2.7
Fla. 1265 185 613 62.7 0 10.2
Fla. 1366 185 654 70.3 0 2.4
Fairton 184 722 60.5 0 6.2
Ithaca 176 808 51.5 0 17.4
Fla. 512 173 717 52.8 0 8.3
Minetto 164 613 61.0 0 19.2
LSD .05 44.3 27.7
cos types
Fla. 24069 318 835 67.3 0 5.5
Valmaine 317 817 77.2 0 1.0
Fla. 1978 253 826 68.9 4.6 3.1
Parris Island 33 813 5.5 44.5 5.0
LSD .05 34.3 78.2 (NS)


Table 2. Yield and average head weight of 11 head types and
planted on March 14, 1980, Zellwood, Florida.


4 cos types of lettuce


Marketable Avg. head Percent
Line q/ha wt. (g) Mkt. Bolt Rot
head types
Fla. 1446 182 849 63.2 0 16.5
Fla. 1265 168 703 65.3 0 26.4
Fla. 7423 148 720 60.0 0 20.0
Shawnee 135 622 63.2 0 23.5
Fla. 1366 127 611 59.1 0 18.2
Fla. 20053 121 668 52.9 0 34.6
Minetto 109 564 51.7 0 14.7
Fla. 9042 67 597 35.9 0 44.5
Ithaca 65 643 48.8 0 23.8
Fla. 512 41 510 43.1 0 24.1
Fairton 19 633 29.3 0 43.9
LSD .05 35.9 16.1
Cos types
Fla. 24069 197 816 73.3 0 0
Fla. 1978 159 817 56.8 0 0.7
Valmaine 158 722 59.0 0 0
Parris Island 114 750 50.0 31.4 5.9
LSD .05 79.7 (NS) 38.3 (NS)








Table 3. Yield and average head weight of 11 head types and
planted October 17, 1979, Sanford, Florida.


4 cos types of lettuce


Marketable Avg. head Percent
Line q/ha wt. (g) Mkt. Bolt Rot

head types
Fla. 1446 382 454 74.6 0 0.5
Shawnee 362 445 90.4 0 0
Fla. 7423 324 422 75.3 0 0.6
Fla. 1265 314 427 70.2 0 0
Fla. 20053 312 436 60.8 0 1.0
Fla. 1366 308 422 64.9 0 1.0
Fla. 512 288 413 69.5 0 0
Minetto 272 386 66.1 0 0.6
Fla. 9042 228 477 48.0 0 0
Fairton 182 513 44.0 0 0
Ithaca 144 345 32.2 0 0
LSD .05 130.8 103.5 (NS)
cos types
Fla. 24069 270 449 55.7 12.8 0.5
Fla. 1978 218 436 45.7 5.6 0.4
Valmaine 188 454 37.0 24.7 0
Parris Island 30 291 6.7 36.2 0
LSD .05 92.2 148.0 (NS)


Table 4. Yield and average head weight of 11 head types and 4 cos types of lettuce
planted December 13, 1979, Sanford, Florida.


Marketable Avg. head Percent
Line q/ha wt. (g) Mkt. Bolt Rot

head types
Minetto 188 427 94.5 0 0.6
Fla. 1366 184 431 92.0 0 1.9
Fla. 7423 180 468 90.7 0 0
Fla. 20053 178 436 94.7 0 0
Fla. 9042 173 468 81.1 0 2.5
Fla. 1265 170 427 94.6 0 0
Fla. 1446 168 427 90.8 0 0.7
Shawnee 168 413 92.1 0 2.6
Fairton 157 445 86.7 0 0.7
Ithaca 138 454 87.0 0 0
Fla. 512 130 404 85.3 0 0.8
LSD .05 33.4 67.6 (NS)
cos types
Fla. 24069 221 568 89.6 0 0
Valmaine 220 531 89.2 0 0
Fla. 1978 208 527 88.2 0 0
Parris Island 124 440 65.9 0 0
LSD .05 33.6 50.9







5

Table 5. Yield and average head weight of 11 head types and 4 cos types of lettuce
planted March 4, 1980, Sanford, Florida.


Marketable Avg. head Percent
Line q/ha wt. (g) Mkt. Bolt Rot

head types
Fairton 104 492 24.5 0 12.6
Fla. 1446 93 417 14.4 0 17.3
Fla. 9042 91 376 17.1 0 26.4
Ithaca 87 303 22.5 0 11.7
Fla. 1265 22 381 4.2 0 11.4
Fla. 7423 19 272 5.1 0 18.7
Fla. 1366 16 341 3.3 0 23.7
Fla. 20053 16 358 3.3 0 14.6
Fla. 512 9 245 2.7 0 10.7
Shawnee 4 341 0.8 0 34.5
Minetto 0 0 0 0 24.0

cos types
Parris Island 0 0 0 99.0 0
Valmaine 0 0 0 97.5 0.4
Fla. 24069 0 0 0 95.7 0
Fla. 1978 0 0 0 90.0 0.8


I I *.




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