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AGRICULTURAL RESEARCH AND EDUCATI N CENTER- u l
JUN 2G i905
Research Report SAN 83-6 June 198
.F.A.S. Univ. of Fih-
Sh-2 Sweet Corn Cultivar Trial, Zellwood, Florida
J. M. White
Sweet corn is an important crop in Florida with a reported value of
$61.1 million in 1981-82 produced on 50,100 acres. Florida is the
nation's leading sweet corn producer for fresh market with 10.7 million
crates. Although the leading cultivars in the Zellwood area are
Bonanza, Cold Cup, and Silver Queen, the shrunken-2 (sh-2) types were
the only lines evaluated in the spring of 1983.
Nine sh-2 lines were planted March 30, 1983, in a Lauderhill muck
soil in Zellwood, Florida. The planting date was 2-3 weeks late due to
wet soil. Seeds were hand planted one kernel per drop, nine inches
apart. Two row plots, three feet wide, and 20 feet long were replicated
four times. Prior to planting, 600 pounds per acre of a 5-5-8 dry
fertilizer were broadcast and disked to incorporate. A 2% parathion
bait was used for wireworm control at the rate of 40 pounds material per
acre. Atrazine and Lorox were used post-emergence at three and five
weeks, respectively, for weed control. Methomyl was applied twice
before silking with ground equipment and four times after silking with
methomyl plus maneb by airplane.
Plots were harvested as close to optimum maturity as possible.
Each cultivar was harvested once when the majority of ears were mature.
Yield data are presented in Table 1. Ear length and width (diameter)
were measured from a random sample of 10 husked ears per replication.
Ear tip fill was assigned a value of 5 when completely filled and a
value of 1 if over one inch of the tip was not filled. Due to heavy
pressure from corn ear worms and sap beetles, it is essential for Florida
grown sweet corn to have good husk cover. Even though AVX 2539 produced
the highest number of crates per acre, it is not suited for central
Florida conditions in the spring due to its poor husk cover. AVX 2540
and 77526 SX 1009 also have poor husk cover. The other six lines were
acceptable. AVX 2519, Sugar Loaf (Harris Seeds), and Honeycomb had
larger ear width than Florida Staysweet, 77529SX1969, and Sugar Loaf
(Sun Seeds). The larger ear width is not as desirable and may be a
Table 1. Average yield, ear size, and general characteristics of sh-2 sweet corn
cultivars, Zellwood, Florida, 1983.
Days Crates wt./ Ear Ear
to per ear % Length Width Husky tip
Cultivar Source harvest acre (g) stand -----cm----- cover fill1
AVX 2539 S 79 333 a 355 a 100 22.1 a 4.57 a 1.5 3.8
Sugar Loaf S 75 306 ab 307 d 99 20.3 c 4.39 bc 3.5 4.0
Honeycomb S 75 299 ab 346 ab 95 21.8 ab 4.49 ab 3.8 3.5
Sugar Loaf H 75 294 ab 315 cd 88 20.5 c 4.52 ab 3.3 4.0
AVX 2519 S 75 290 ab 339 abc 100 20.0 c 4.57 a 3.8 4.8
AVX 2540 S 77 278 ab 344 ab 96 21.9 a 4.41 bc 2.3 4.3
Florida Staysweet H 78 272 ab 354 a 84 21.2 b 4.26 c 4.5 4.5
77529 SX 1969 H 77 254 ab 324 bed 74 22.4 a 4.63 a 1.0 1.0
ZCultivar: arranged by yield based on number of ears per plot.
YHusk cover: 1-poor with exposed ends; 5-excellent with 1 inch or more cover.
XEar tip fill: 1-over 1 inch of tip not filled; 5-1/4 inch or less of tip not filled.
Mean separation within a column by Duncan's multiple range test, 5% level.
Seeds were obtained from:
H Joseph Harris Co., Inc., 3670 Buffalo Rd., Rochester, NY 14624.
S Sun Seeds (Agrigenetics Corp.), P. 0. Box 1438, Hollister, CA 95023.