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Title: Lettuce variety evaluation
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Permanent Link: http://ufdc.ufl.edu/UF00075827/00001
 Material Information
Title: Lettuce variety evaluation
Series Title: Lettuce variety evaluation
Translated Title: Research report - UF Agricultural Research and Education Center ; CF-78-5 ( English )
Physical Description: Serial
Language: English
Creator: White, J. M.
Publisher: Agricultural Research and Education Center, University of Florida
Publication Date: 1978
 Record Information
Bibliographic ID: UF00075827
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 144607791

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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










University of Florida
AGRICULTURAL RESEARCH AND EDUCATION CENTER
Sanford, Florida

Research Report CF 78-5 December 29, 1977

Lettuce Variety Evaluation

J. M. White

Two plantings in an Everglades mucky peat at Zellwood, Florida, were made to
evaluate four cos or Romaine lettuce types and 11 head lettuce types. Seeds were
supplied by Dr. V. L. Guzman, AREC-Belle Glade, Florida. In addition, one head type
breeding line was evaluated in the first planting. Seeds were supplied by Dr. J. O.
Strandberg, AREC-Sanford, Florida.

The first planting was seeded October 1, 1976. A completely randomized
incomplete block design using six replications was used. Plots were 30 feet long
with two rows on each bed. Beds were on three foot centers with the top of the
bed 22 inches wide. Plants were thinned to 12 inches apart.

Six hundred pounds per acre of a 10-4-10-3 fertilizer was broadcast and disked
to incorporate before beds were made. Two additional side applications of 600
pounds per acre of a 10-4-10-3 fertilizer were applied during the early growing
season. Marketable head count, weight, and frost injury data were taken on
December 22, 1976, and January 3, 1977. A summary of the results are found in
Table 1. Fla. 1978 had the best cos type field appearance. Fla. 512 had the best
head type field appearance. Fla. 1265, Fla. 1446, and Fla. 1443 also looked good
and were close in appearance to Fla. 512. The per cent marketable yield was low
in the cos lines due to bolting seederss). Three heavy frosts also injured both
types, reducing the yield. Dark Green had the lowest yield because of bolting.

The second planting was seeded on November 18, 1976. Plot size and fertilizer
rates were the same as outlined above. Harvesting for yield data was on March 17,
and 23, 1977. A summary of the results are found in Table 2. Frost injury was not
evident, therefore, no rating was made. The overall field head size estimates do
not relate to average marketable head weight. This may be due to some lines which
had small heads which were not marketable. The field estimated size was based on
all heads in the field. The average marketable head weight would account for only
those heads cut.

Fla. 1978 had higher yields in both plantings than the other cos types. Fla.
1265 had the highest yields in both plantings for the head, types. Fla. 1446, Fla.
512, and Fla. 1365 also yielded high in both plantings.



HUME LIBRARY

JAN-- 1978

I.F.A.S.- Univ. of Florida











Table 1. Yield and average head weight of four cos types and 12 head types of
lettuce planted on October 1, 1976, Zellwood, FL.


Cwt./ Per cent Avg.z Frosty HeadW
Line acre marketable head wt. rating Appearance size

cos types
Fla. 1978 222 59.1 1.34 3.3 4 M-L
Valmine 146 37.5 1.39 1.6 2 M
Parris Island 69 20.5 1.27 1.2 1 S
Dark Green 38 14.8 0.96 1.3 2 S

Head types
Fla. 1265 218 71.0 1.15 2.1 3 S
Fla. 1446 210 57.4 1.35 1.9 4 M-L
Fla. 1443 191 57.0 1.24 2.1 4 M-L
Fla. 1365 187 54.8 1.27 2.6 3 M-L
Pla. 512 177 57.8 1.13 2.1 3 M-S
7514 174 54.3 1.27 2.0 4 M-L
Fla. 1366 173 57.3 1.14 1.7 3 M
Fla. 928 168 49.0 1.35 2.7 3 L
Fairton 153 51.0 1.19 3.3 2 M-L
Fla. 1268 121 39.4 1.13 1.4 3 S
Fla. 2002 120 41.0 1.04 1.3 3 S
Fla. 1421 112 33.5 1.24 2.7 2 M
LSD .05 41.2 .201


ZAverage head weight in pounds.

Yl=severe; 5=no damage


Xl=poor general appearance;

WS=small; M=medium; L=large


5=best













Table 2. Yield and average head weight of four cos types and 11 head types
of lettuce planted on November 18, 1976, Zellwood.

Cwt/ Avg.z Head
Line acre marketable head wt. appearance' size

cos types

Fla. 1978 324 85.2 1.28 4.0 M
Valmaine 285 82.2 1.29 3.5 M
Parris Island 253 73.1 1.33 3.3 S
Dark Green 243 59.2 1.44 2.1 S

head types

Fla. 1265 177 61.1 0.96 3.8 M-L
Fla. 1366 177 59.7 1.00 3.3 M
Fla. 1421 175 53.4 1.15 2.5 S-M
Fla. 512 170 58.3 1.00 2.9 M-L
Fla. 1446 162 58.2 1.04 2.8 S-M
Fla. 1268 152 53.8 0.97 2.7 S
Fla. 1365 141 49.1 1.08 2.3 S
Fairton 128 53.0 0.94 2.8 S-M
Fla. 928 125 44.1 1.10 2.0 S-M
Fla. 2002 121 44.9 0.88 3.4 S-M
Fla. 1443 103 41.9 0.87 3.8 M-L

LSD .05 60.3 .248


ZAverage head weight in pounds.

Yl=poor general appearance; 5=best


XS=small; M=medium; L=large




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