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Group Title: Lettuce evaluation.
Title: Lettuce evaluation, 1979 (metric units)
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Permanent Link: http://ufdc.ufl.edu/UF00075817/00002
 Material Information
Title: Lettuce evaluation, 1979 (metric units)
Series Title: Lettuce evaluation.
Uniform Title: Research report - UF Agricultural Research and Education Center ; CF-79-5-M
Physical Description: Serial
Language: English
Creator: White, J. M.
Publisher: Agricultural Research and Education Center, University of Florida
Publication Date: 1979
 Record Information
Bibliographic ID: UF00075817
Volume ID: VID00002
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







r A( University of Florida
q -5k1r AGRICULTURAL RESEARCH AND EDUCATION-CENTER
Sanford, Florida

Research Report CF 79-5 M1 UML:: ? 1979
Lettuce Evaluation
J. M. White jUN 2G6 i % 5
Assistant Horticulturist

Two plantings in Lauderhill muck at Zellwood an<, 4 t -1J s0n j fine
sand at Sanford were made to evaluate three cos or Romaine lettuce types and 10
head lettuce types. Seeds-were--supplied by Dr. V. L. Guzman,AREC-Belle Glade, FL.

The first planting in Zellwood was hand seeded November 28, 1978, and harvested
as the cultivars matured from March 12 to 21, 1979. A broadcast application of
22.4 q/ha of a 0-20-18 was disked in before beds were made. An additional
application of 6.7 q/ha of a 10-4-10-3 fertilizer was applied during the growing
season. Beds were on 91 cm centers-with the top of the bed 56 cm wide and about
20 cm high. Plots were-1.4 km long with 2 rows on each bed. Plants were hand
thinned to 29 cm apart about three weeks after seeding. Freeze injury occurred
on January 3, 1979, which reduced yield and plant size, especially in the cos
cultivars. A summary of the results is found in Table 1. There were no significant
differences in cos lettuce yield or head weight, although Florida 1978 had the
highest yield, heaviest heads, and less soft rot than Valrniie or Paris Island.
Four lines of head lettuce had higher yields than the standard Minetto, but were
not significantly different. Only two lines yielded significantly less than
Minetto. There was a wide range in head weight (indication of size), but no
significant differences were found.

The second planting in Zellwood was hand seeded February 20, 1979. Cultural
practices and plot design were the same as for the first planting, except only one
row of plants per bed were seeded. This gave more space per plant and fewer plants
per plot. Total marketable yields were higher and the percentage of marketable
plants improved dramatically. In seven of the 10 lines of head lettuce, a twisting
of the center leaves forming a pointed turban top was noted. The percentage of
plants with this characteristic is given in Table 2. Florida 9042 had the highest
marketable yield, but the heads were too large and loose. Minetto, Ithaca,
Florida 1446, and Florida 1799 had large heads. Overall, Florida 1446 looked the
best in this test. In the cos lines, Florida 1978 looked the best and had the
highest yield, but not significantly higher. A summary of the results of the
April 20, 1979, harvest is found in Table 2.

The first planting in Sanford was hand seeded December 21, 1978, and harvested
on March 23 and 30 as the cultivars matured. The soil was treated with D-D soil
fumigant for nematodes on December 8. Fertilizer, at the rate of 5.6 q/ha of
-5-8, was broadcast and disked in before planting. On about two week intervals,
two applications of 5-5-8 and then three applications of 10-4-10-3 at 5.6 q/ha were
applied and worked in by hand. After planting, CDEC was applied and irrigated in
to control weeds. A complete randomized design with four replications was used.
Plots were 0.5 km long by 76 cm wide using one row per plot. The plots were
flooded on January 3, 1979, with standing water for over 24 hours. The low
temperature was -1.7 oc at this time. The stand was poor for all lines, but some
lines were able to produce marketable heads under these conditions.. --


1Please refer to Research Report CF 79-5 E for English units.








2


Harvest data are summarized in Table 3. Florida 1978 had the best overall field
appearance of the cos types. Florida 20053 had the best overall appearance of the
head types with Florida 1446 and 9042 looking almost as well. Florida 1265 was
slightly small. The standard lines, Minetto, Ithaca, and Fairton, had poor plant
stands thereby reducing their yields.

The second Sanford planting was hand seeded February 22, 1979. Cultural
practices and plot design were the same as for the first planting, except planting
was done on beds. The beds were about 118 cm across the top and 10 cm high.
There were two rows per bed. Harvest data are summarized in Table 4. All three
cos lines bolted before reaching marketable size. Poor plant stands were obtained
with Fairton and Florida 512. Four Florida lines had as good, or better, field
appearance as the standard, Ithaca.











Table 1. Yield and average head weight of 3 cos types and 10 head types of
lettuce planted on November 28, 1978, Zellwood, Florida.


Percent Avg.Head
Line q/ha Marketable Soft Rot Wt.(g)


cos type

Florida 1978 177 41.8 1.6 621

Valmaine 133 45.0 4.9 569

Paris Island 114 29.4 3.9 533

LSD .05 99.1 91.3




head type-

Fla. 1446 266 75.7 9.4 521

Fla. 20053 254 81.7 4.7 441

Fla. 1265 246 72.7 11.5 521

Fla. 9040 228 70.0 10.7 490

Minetto 201 68.8 10.8 441

Ithaca 183 64.9 5.5 486

Fla. 9042 180 57.1 11.5 485

Fla. 1799 158 86.7 6.8 459

Fla. 512 110 55.4 7.7 479

Fafiton 22 33.0 4.4 466

LSD .05 65.1 128.9











Table 2. Yield and average head weight of 3 cos types and 10 head types
of lettuce planted on February 20, 1979, Zellwood, Florida.


Percent ':"ut_._: Avg.Head
Line q/ha Marketable Soft Rot Turban Top Wt.(g)

cos type

Florida 1978 298 95.8 0 -972

Paris Island 276 98.6 0 -953

Valmaine 248 95.1 0.4 1022

LSD .05 71.6 315.0


head type

Fla. 9042 309 95.5 3.6 0 913

S Fla. 1446 3Q1 97.1 2.4 8.2 935

Fla. 20053 294 98.6 1.4 15.2 885

Fla. 1265 294 99.0 1.0 22.2 922

Fla. 9040 277 97.9 2.1 1.0 935

Minetto 265 98.6 1.0 25.2 803

Fla. 1799 264 95.7 1.6 0 931

Ithaca 260 98.5 0.5 0 817

Fla. 512 214 96.8 1.3 32.3 881

fdrG 81 71.0 0 7.3 595
LSD .05 38.6 77.











Table 3. Yield and average head weight of 3 cos types and 10 head types of
lettuce planted December 21, 1978, Sanford, Florida,


Total Percent Avg. Head
Line Number q/ha Marketable Wt. (P)

cos type

Florida 1978 15 21 26.7 749

Valmaine 6 16 50.0 742

Paris Island 6 9 33.3 658


head type

Fla. 1446 58 176 96.6 439

Fla. 20053 53 169 96.2 462

Fla. 1265 86 167 79.2 342

Fla. 9042 51 150 94.1 437

Fla. 1799 46 128 84.8 459

Fla. 9040 31 117 93.5 562

Minetto 37 114 97.5 441

Ithaca 26 92 100.0 493

Fla. 512 14 39 85.7 450

Fatzton 4 3 25.0 363











Table 4. Yield and average head weight of 3 cos types and 10 head types of
lettuce planted on February 22, 1979, Sanford, Florida.

------------------------------------------------------------------
Total q/ha Percent Avg. Head
Line Number Marketable Bolts Wt. (g)

cos type

Florida 1978 97 0 0 83.5 0

Valmaine 36 0 0 50.0 0

Paris Island 40 0 0 70.0 0


head type

Fla. 1265 76 160 75.0 0 390

Fla. 20053 62 157 83.9 0 418

Fla. 1446 78 153 65.4 0 427

Fla. 9040 66 150 68.2 0 472

Ithaca 56 149 78.6 0 477

Fla. 1799 58 107 58.6 0 445

Fla. 9042 37 87 64.9 0 527

Fla. 512 29 75 79.3 0 449

Minetto 54 74 59.3 0 331

Fairgn 8 3 12.5 0 363

LSD .05 44.9 90.7




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