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Group Title: Research report - UF Agricultural Research and Education Center ; CF-77-5
Title: Lettuce variety trials, 1976
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Permanent Link: http://ufdc.ufl.edu/UF00075833/00001
 Material Information
Title: Lettuce variety trials, 1976
Series Title: Research report - UF Agricultural Research and Education Center ; CF-77-5
Physical Description: Book
Language: English
Creator: White, J. M.
Publisher: Agricultural Research and Education Center, University of Florida
Publication Date: 1977
 Record Information
Bibliographic ID: UF00075833
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 123077669

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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










AGRICULTURAL RESEARCH AND EDUCATION CENTER
Sanford, Florida ---

Research Report CF 77-5 6Augu ', BARy

Lettuce Variety Trials, 1976 SEP 2 7 1977
J. M. White
Assistant Horticulturist LI.F/ e U .f
; z" l"jtiV. of Florida

Two plantings in Zellwood on Everglades mucky peat and one piatitig.in
Sanford on Leon fine sand were made to evaluate several lettuce breeding lines
for yield and head weight. Seeds were supplied by Dr. V. L. Guzman, Belle
Glade, Florida.

The first Zellwood planting was seeded on November 20, 1975. A completely
randomized block design using ten varieties replicated four times was used. Plots
were 30 feet long with two rows per three foot bed. Six hundred pounds per acre
of a 10-4-10-3 fertilizer was broadcast and disk before beds were made. Fla.
1265, 1366, 1421, 1446 and 2002 were harvested on February 26, 1976.

Valmaine, Fla. 512, 1420, 1974 and 1978 were harvested on March 2 after
a two inch rain with hail which occurred on March 1. Yield data is found in
Table 1.

Fla. 1974 significantly out-yielded all other lines tested. It also had the
heaviest average head weight with 1.89 pounds per head. Fla. 1978 follow with
an average head weight of 1.84 pounds but total yield was down due to only 37.9
per cent being marketable at first harvest.

The second Zellwood planting was seeded on March 5, 1976. A completely
randomized block design using four varieties replicated four times was used.
Plots were twenty feet long by three feet wide with two rows of plants per bed.
Twelve hundred pounds per acre of a 10-4-10-3 fertilizer was broadcast and
disk before beds were made. All lines were harvested on May 6, 1976. Yield
data is found in Table 2.

Premier Great Lakes was too large and loose and had a significantly lower
yield than Fla. 1978, 1974 and Valmaine.

Under these later than normal planting conditions, Fla. 1974 had 69% belts.
The weights of the bolts were included in the marketable data in order t4 be able
to test statistically. Its true marketable yield would have dropped frim 394 C
wt/A to 122 C wt/A, making it significantly lower than the other lines tested.








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The Sanford planting was seeded on January 12, 1976. A completely
randomized block design using six varieties or lines replicated four times was
used. Plots were 60 feet long with 3 rows of plants on beds on 5-foot centers.
Only the center row was harvested for data. Five hundred pounds per acre of
a 5-5-8 fertilizer was broadcast and disk before beds were made. Three side
applications of 500 lbs/A each of a 5-5-8 fertilizer were made and hand scratched
to incorporate. Harvesting was on April 9, 1976. Yield data is found in Table 3.

Fla. 1978 was significantly higher in marketable yield than the other five
lines. It also had the heaviest average head weight. There was no significant
difference in the yield of the other five lines in this test.

Overall, Fla. 2002 was the poorest line tested. It had small, pointed heads
with a yellow top leaf. Fla. 1978 and Fla. 1974 were cos type rather than head
lettuce. Their shape, color, field appearance and flavor were considered good.
Fla. 1366 and Fla. 1265 were the best head types tested in Zellwood. They were
not tested in Sanford due to insufficient seed. Fla. 1420 had the highest yield
in Sanford for the head types, but a bitter flavor was noted. It had a more
consistent yield and appearance than Fla. 1446 and Fla. 1421.


Table 1. Yield and average head weight of ten lettuce varieties, Zellwood, 1976.

C wt. Per cent Average
Variety Per A. Harvested head wt.

Fla. 1974 263 63.2 1.89
Fla. 1366 173 63.9 1.11
Fla. 1265 162 60.9 1.19
Fla. 1420 156 56.5 1.24
Fla. 1978 154 37.9 1.84
Fla. 1421 147 53.4 1.19
Fla. 521 141 56.3 1.13
Fla. 1446 122 56.7 1.03
Valmaine 105 31.2 1.53
Fla. 2002 97 41.8 1.02
LSD.05+ 59.6
LSD .05








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Table 2. Yield and average head weight of four lettuce varieties planted in
late Spring, Zellwood, 1976.


C wt. Per cent Average
Variety Per A. Harvested head wt.


Fla. 1978 439 86.0 2.18
Fla. 1974 394 94.6 1.78
Valmaine 362 78.2 2.06
Premier
Great Lakes 253 61.7 1.76
LSD .05 + 85.3


Table 3. Yield and average head weight of six lettuce varieties, Sanford, 1976.


C wt. Per cent Average
Variety Per A. Harvested head wt.


Fla. 1978 215 63.0 1.70
Fla. 1420 106 69.9 1.02
Fla. 512 93 58.2 0.89
Fla. 1421 75 53.2 0.92

A M4 64 50,7 0609
Fla. 2002 64 38.9 0.90
LSD .05 + 52.3


1'




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