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Group Title: Evaluations of sweet corn varieties.
Title: Evaluations of sweet corn varieties. Spring 1994
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Title: Evaluations of sweet corn varieties. Spring 1994
Series Title: Evaluations of sweet corn varieties.
Translated Title: Research Report - University of Florida Institute of Food and Agricultural Sciences ; 94-06 ( English )
Physical Description: Serial
Language: English
Creator: Hancik, I. D.
White, James M.
Publisher: Central Florida Research and Education Center, Institute of Food and Agricultural Sciences, University of Florida
Publication Date: 1994
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Bibliographic ID: UF00075807
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 144607376

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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






/^^ 'i rston Sciencr
,- University of Florida l irar's
9- Institute of Food & Agricultural Sciences
Central Florida Research & Education CentdJN 2 7 IS93
Sanford, FL 32771-9608
University of Rorida
Research Report SAN94-06 June 1994

Evaluations of Sweet Corn Varieties, Spring 1994

Ivalou D. Hancik and James M. White

A supersweet (shrunken-2 gene) sweet corn variety trial was conducted at Lust Farms,
Inc., Apopka, FL, during the spring 1994 growing season. The trial was limited to
cultivars/breeding lines of the gene type homozygous shrunken-2 (sh2), i.e., supersweet, since
these cultivars are considered the standard for large commercial growers. Yellow, white, and
bicolored lines were included in the trial.

The kernels of the sh2 type sweet corn have at least 2-3 times the total sugars of normal
sweet corn at optimum harvest; conversion of sugar to starch is also much slower. This slower
conversion facilitates a longer harvest and storage period along with an increased time for
consumption. Consumer preference has also shifted toward the supersweet lines of sweet corn.
In light of the widespread use of the sh2 type sweet corn, it is important to evaluate
commercially-available and advanced breeding liens for their adaptability to central Florida's
growing conditions.

Materials & Methods

Seeds were planted by hand on March 14, 1994; plots were double-row, 6' wide x 25'
long with 9" in-row spacing. Four replications were arranged in a randomized complete block
design.

Cultural practices, provided by the cooperating grower, were comparable to the routine
practices used by commercial growers to produce a sweet corn corp in central Florida.

Plots were harvested by hand at peak maturity, beginning May 20 and ending May 26.
Only first ears and/or marketable second ears were harvested. Individual plots were harvested
only once. Ears were counted and weighed; subsamples of 10 marketable ears/plot were
selected, husked, and evaluated for length, width, maturity, tip fill, husk cover, and kernel color
(Table 1). Weather data are recorded in Table 2.

Results & Discussion

Sweet corn yields, expressed as 42 lb crates/acre, ranged from 188-413 crates/acre. The
five top-yielding entries were GSS9330, Standing Ovation, Sweet William, Billy #1, and
Cabaret. The lowest yielding lines in this trial were Maxim, Punchline, Upmost, Endeavor, and
XPH 3104.







Considerable variation in ear length was recorded; ear length (cm) ranged from 18.2
(Maxim, HMX2343S) to 20.8 (FMX 329). Ear diameter (cm) was less variable, ranging from
4.3 (Maxim) to 5.2 (Sunex 2757).

Husk cover was marginal on Cabaret, Sunex 2757, and Upmost. However, Sunex 2757
and Upmost were over-mature at harvest, which may have contributed to the poor husk cover
rating. Tip fill was generally good, however XPH 3027 was somewhat weak in tip fill.

This report is not intended to recommend one variety over another, but rather is meant
as a general guideline for variety selection. Different field locations, planting dates, and
cultural practices may alter the performance of these sweet corn lines; growers should be
mindful of this variability when selecting a new variety and planting small test areas of new
varieties may be advisable.

Seeds were obtained from the following:

AM AMSA Seed Co., P.O. Box 5301, Modesto, CA 95352-5301
AS Asgrow Seed Co., 7000 Portage Rd., Kalamazoo, MI 49001
FM Ferry-Morse Seed Co., P.O. Box 4938, Modesto CA 95352-4938
HM Harris Moran Seed Co., P.O. Box 3091, Modesto, CA 95352
RNK Rogers NK Seed Co., P.O. Box 4188, Boise, ID 83711-4188
ii SU Sunseeds, P.O. Box 1480, Hollister, CA 95024-1480

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Table 1. Sweet corn variety trial Zellwood, FL Spring 1994.


Days to Yield/acre % Huskx Tip" Kernel" Avg. ear" (cm) Diseases
Entry Source harvest crates cwt stand cover fill color length diam. Maturityt Rust NCLB Notes/comments

GSS 9330 RNK 70 413 a 173 a 99 a-c 5.0 a 5.0 a Y 19.0 hi 4.5 f-i 0 2.0 0.5
Standing Ovation AM 70 406 ab 170 ab 89 cd 4.9 a 4.9 ab Y 19.7 d-g 4.4 h-j 0 0.5 2.5 long flags, pointy ears
Sweet William AM 70 378 a-c 159 a-c 89 cd 4.9 a 4.5 a-d Y 19.6 d-g 4.3 ij 0 1.0 2.0
Billy #1 AM 67 373 a-c 157 a-c 88 cd 4.9 a 4.6 a-c Y 20.3 a-c 4.7 cd 0 0.5 0.5 glossy, nice, uniform
Cabaret AS 70 367 a-c 154 a-c 95 a-d 2.3 bc 4.1 c-e B 19.9 c-f 4.7 cd 0 0.5 0.5 tip protrudes, slight curve

FMX 329 FM 67 363 a-c 152 a-c 95 a-d 2.9 b 4.3 b-d Y 20.8 a 4.9 b -1 1.0 1.5 green tip
HMX 2343S HM 70 354 a-d 149 a-d 100 a 5.0 a 5.0 a Y 18.2 k 4.4 g-j 0 0.5 1.5 small ear, slightly curved
Sunex 2757 SU 67 352 a-d 148 a-d 83 de 2.0 c 4.6 a Y 19.6 d-g 5.2 a +2 1.0 2.5 large kernels, big ears
Promenator AM 73 345 a-e 145 a-e 86 c-e 4.6 a 4.4 a-d Y 19.5 e-g 4.6 d-f 0 0.5 0.5
Ultimate HM 70 328 a-e 138 a-e 97 a-d 5.0 a 4.9 ab Y 18.6 i-k 4.5 f-i 0 1.0 2.0

Monument AM 70 320 b-e 134 b-e 86 c-e 4.8 a 4.8 a-c V 20.1 b-d 4.5 f-i -1 1.0 1.0 somewhat pointy
XPH 3027 AS 67 316 b-e 133 b-e 92 b-d 3.0 b 3.6 e Y 20.7 a 4.7 c-e +2 2.5 3.5
XPH 3024 AS 73 315 b-e 132 b-e 92 b-d 4.9 a 4.4 a-d Y 20.4 a-c 4.6 e-g 0 1.0 0.5 lodges, slightly curved
GSS 3710 RNK 70 309 c-e 130 c-e 90 cd 4.3 a 4.9 ab Y 19.3 gh 4.8 bc 0 1.0 0.5
GSS 4606 RNK 73 305 c-e 128 c-e 100 a 4.6 a 4.8 a-c Y 18.5 i-k 4.5 f-h -1 1.0 0.5 many flags, compact rows
---------------------------------------------------------------------------------------------------------------- ----------------------------------------------
Shimmer AS 73 304 c-e 128 c-e 89 cd 4.3 a 4.3 b-d Y 20.1 b-e 4.7 cd 0 0.5 0.5
Maxim HM 67 286 c-e 120 c-e 86 c-e 5.0 a 5.0 a Y 18.2 jk 4.3 j -1 1.5 3.0
Punchline AS 67 286 c-e 120 c-e 90 cd 4.6 a 4.6 a-c Y 18.7 ij 4.4 h-j 0 1.0 0.5
Upmost HM 67 266 d-f 112 d-f 94 a-d 1.6 c 5.0 a Y 19.2 gh 4.7 cd +3 1.5 0.5 ear protrudes, green tip
Endeavor AS 67 256 ef 107 ef 83 de 4.8 a 4.3 b-d Y 19.4 f-h 4.5 f-i 0 1.0 0.5
XPH 3104 AS 73 188 f 79 f 73 e 2.4 be 3.9 de W 20.5 ab 4.4 h-i -2 1.0 3.0 curved ear. tip protrudes

'Mean separation in columns by Duncan's Multiple Range Test, 0.05 level. Means followed by the same letter are not significantly different. YYield expressed as 42 lb crates/A.
"Husk cover: l=ear protrudes from husk; 5=ear tightly wrapped and completely covered. "Tip fill, 0=at least 1" of unfilled kernels at the ear tip; 5=full at tip.
VKernel color: B=bicolor; W= white, Y=yellow. "Ear length/diam. (cm): measurements on husked ears, an average value of a 10-ear sample/replication.
tMaturity: 0=harvested at optimal maturity, (+) or (-) indicates over mature or under mature, respectively, followed by the number of days.
sDisease ratings: where 0=no sign of disease to 5= severe disease problem; rust=common rust, NCLB=northern corn leaf blight (Exserohilum turcicum).
a a a








Table 2. Temperature and rainfall at CFREC-Sanford (30 miles
east of Zellwood) during the spring 1994 sweet corn
season (March 14 May 26).

Daily temperature (oF) Rainfall
Month Maximum Minimum (in)

March 14-31 91 51 0.86

April 1-30 91 45 1.38

May 1-26 95 54 1.84

Total 4.08




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