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Group Title: Lettuce evaluation.
Title: Lettuce evaluation, 1979 (English units)
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Permanent Link: http://ufdc.ufl.edu/UF00075817/00001
 Material Information
Title: Lettuce evaluation, 1979 (English units)
Series Title: Lettuce evaluation.
Translated Title: Research report - UF Agricultural Research and Education Center ; CF-79-5-E ( English )
Physical Description: Serial
Language: English
Creator: White, J. M.
Publisher: Agricultural Research and Education Center, University of Florida
Publication Date: 1979
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Bibliographic ID: UF00075817
Volume ID: VID00001
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





9- L University of Florida
AGRICULTURAL RESEARCH AND EDUCATION CENTER
Sanford, Florida

Research Report CF 79-5 E1 May 29, 1979

Lettuce Evaluation
J. M. White
Assistant Horticulturist I t


Two plantings in Lauderhill muck at Zellwood and to plal g6 in'Makka fle
sand at Sanford were made to evaluate three cos or Roma ne lettuce types and 10
head lettuce types. Seeds were supplied by Dr. V. L. GL lRE ade L.

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
one ton per acre of a 0-20-18 was disked in before beds were made. An additional
application of 600 pounds per acre of a 10-4-10-3 fertilizer was applied during the
growing season. Beds were on 3-foot centers with the top of the bed 22 inches wide
and about 8 inches high. Plots were 45 feet long with 2 rows on each bed. Plants
were hand thinned to 12 inches 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 Valmaine 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 500 pounds per
acre of 5-5-8, 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
500 pounds per acre 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 15 feet long by 2.5 feet 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 29"F at this time. The stand was poor for all
lines, but some lines were able to produce marketable heads under these conditions.


IPlease refer to Research Report CF 79-5 M for metric units.











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 48 inches across the top and 4-inches 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 three cos types and 10 head types of
lettuce planted on November 28, 1978, Zellwood, Florida.

Cwt/ Percent Avg. head
Line acre Marketable Soft rot wt. (Ibs)

cos types
Florida 1978 158 41.8 1.6 1.37
Valmaine 102 45.0 4.9 1.25
Paris Island 119 29.4 3.9 1.17
LSD .05 88.5 .201

head types
Florida 1446 237 75.7 9.4 1.15
Florida 20053 227 81.7 4.7 0.97
Florida 1265 219 72.7 11.5 1.15
Florida 9040 204 70.0 10.7 1.08
Minetto 179 68.8 10.8 0.97
Ithaca 164 64.9 5.5 1.07
Florida 9042 161 57.1 11.5 1.06
Florida 1799 141 86.7 6.8 1.01
Florida 512 98 55.4 7.7 1.05
Fairton 20 33.0 4.4 1.03
LSD .05 58.2 .284







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

Cwt/ Percent Avg. head
Line acre Marketable Soft rot Turban top wt. (Ibs)

cos types

Florida 1978 266 95.8 0.00 0.00 2.14
Paris Island 246 98.6 0.00 0.00 2.10
Valmaine 222 95.1 0.40 0.00 2.25

LSD .05 63.9 .694

head types

Florida 9042 276 95.5 3.60 0.00 2.01
Florida 1446 268 97.1 2.40 8.20 2.06
Florida 20053 262 98.6 1.40 15.20 1.95
Florida 1265 262 99.0 1.00 22.20 2.03
Florida 9040 248 97.9 2.10 1.00 2.06
Minetto 237 98.6 1.00 25.20 1.78
Florida 1799 236 95.7 1.60 0.00 2.05
Ithaca 232 98.5 0.50 0.00 1.80
Florida 512 191 96.8 1.30 32.30 1.94
Fairton 73 71.0 0.00 7.30 1.31

LSD .05 34.5 .172



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

Total Cwt/ Percent Avg. head
Line number acre marketable wt. (Ibs)

cos types
Florida 1978 15 19 26.7 1.65
Valmaine 6 14 50.0 1.63
Paris Island 6 8 33.3 1.45

head types
Florida 1446 58 157 96.6 0.97
Florida 20053 53 151 96.2 1.02
Florida 1265 86 149 79.2 0.75
Florida 9042 51 134 94.1 0.96
Florida 1799 46 114 84.8 1.01
Florida 9040 31 104 93.5 1.24
Minetto 37 102 97.5 1.97
Ithaca 26 82 100.0 1.09
Florida 512 14 35 85.7 0.99
Fairton 4 2 25.0 0.80













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

Total Cwt/ Percent Avg. head
Line number acre Marketable Bolts wt. (lbs)

cos -types

Florida 97 0 0 83.5 0
Valmaine 36 0 0 50.0 0
Paris Island 40 0 0 70.0 0

head types

Florida 1265 76 143 75.0 0 0.86
Florida 20053 62 140 83.9 0 0.92
Florida 1446 78 137 65.4 0 0.94
Florida 9040 66 136 68.2 0 1.04
Ithaca 56 133 78.6 0 1.05
Florida 1799 58 96 58.6 0 0.98
Florida 9042 37 78 64.9 0 1.16
Florida 512 29 67 79.3 0 0.99
Minetto 54 66 59.3 0 0.73
Fairton 8 2 12.5 0 0.80

LSD .05 40.1 .199




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