Group Title: Research report - University of Florida Agricultural Research Center ; RC-1975-9
Title: Results of commercial corn variety testing in south central Florida
Full Citation
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 Material Information
Title: Results of commercial corn variety testing in south central Florida
Series Title: Research report ;
Physical Description: 6 p. : ; 28 cm.
Language: English
Creator: Mislevy, P ( Paul ), 1941-
Jones, D. W
Agricultural Research Center, Ona
Publisher: Agricultural Research Center,
Agricultural Research Center
Place of Publication: Ona, FL
Publication Date: 1975
Copyright Date: 1975
Subject: Corn -- Varieties -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
Statement of Responsibility: P. Mislevy and D.W. Jones.
General Note: Caption title.
General Note: "September, 1975."
 Record Information
Bibliographic ID: UF00074266
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 85868480

Full Text

S. Ona Agricultural Research Center *
' C Research Report R!-1975-9 fUM :I I 1975

Results of Commercial Corn Variety Testing i SouiU1e9ta75jorida, 1975.

P. Mislevy and D. W. nh nv. r

Corn can play an important role in the feeding of livestock in Central
Florida. When harvested as silage or grain, it can occupy a void presently found
in the cattle feeding industry of Florida. High quality corn silage can provide
cattle with a substantial carbohydrate input possibly reducing out-of-pocket
grain costs and also provide quality feed for growing out calves.

Well managed corn harvested for silage at the proper stage of maturity will
produce 7 to 10 tons of dry matter per acre in approximately 3.5 months. This
allows the land to be free for the growth of other crops over the remaining eight

The nutritional and chemical composition of corn silage varies with the
ratio of grain to stover and maturity at which the plant is harvested. High
quality corn silage can be produced by harvesting the crop when the kernel is in
hard dent stage. Corn silage harvested at this stage is usually high in energy,
carotene, and vitamin D and low in mineral, with a protein content of about 8%.
To produce high yields of quality forage, proper seeding date, adapted hybrids,
high fertility, water control, correct plant populations and weed and insect
control are necessary.

The purpose of these studies were to evaluate commercial corn hybrids for
silage and/or grain production at various locations in South Central Florida.

Experimental Procedure

The experiments were conducted at the Agricultural Research Center (ARC)
Ona and in Orange, Manatee and Polk counties during 1975. The experimental
design in each instance was a randomized complete block, with four replications.

The experiment was seeded on Myakka fine sand February 27 in Orange county;
sandy muck March 7 in Manatee County; Ona fine sand March 3 at the ARC, Ona; and
Immokalee fine sand March 17 in Polk County. All cultural practices (preparing
the seed bed, fertilization and etc.) were conducted by the cooperator at the
Orange, Manatee and Polk county locations. Fertilization practices carried out
by the Orange and Manatee county cooperators was 180-90-180 and 150-120-250 lb/A
N-P,05-K20 respectively. At Ona and Polk County 50-120-240 Ib/A were applied at
seeding, followed by 100 lb/A actual nitrogen (N) when the corn attained a
height of 6-8 inches and an additional 100 lb/A N when the corn reached a height
of 24 inches. In addition to the major nutrients applied at Ona and Polk County
20 and 30 lb/A respectively Fritted micronutrients FTE 5032/ were applied.

1/ Assistant Professor (Assistant Agronomist) Agricultural Research Center, Ona
and Professor (Agronomist) Agricultural Extension Service, Gainesville.

2/ Micronutrients having the following elemental content: Iron 18.0%; Zinc
7.0%; Manganese 7.5%; Copper 3.0%; Boron 3.0% and Molybdenum 0.2%.

All experimental areas contained an adequate amount of calcium. Irrigation
was initially available at the ARC, Ona, Orange and Polk counties. However due
to physical problems such as pump break downs or inadequate sprinkler facilities
the Orange and Polk county experiments were seriously harmed due to lack of
adequate moisture.

Final plant populations at all locations were 21,000 plants per acre. The
herbicide used in Orange County was Lasso applied pre-emergence. Two and one-half
lb/A Aatrex and 2 qts/A Lasso was applied pre-emergence at the Ona, Polk and
Manatee county locations.

Corn at all four locations was harvested for silage when the kernels were
nt the hard dent stage of maturity, with plants containing approximately 31% dry
matter. The corn grain experiment at Ona was harvested 2 weeks after the plants
were harvested for silage. Ears contained approximately 367. moisture at harvest.
lto lodging was observed among varieties. Southern corn rust (Puccinia polysora
Underw) was observed at various intensities at the ARC, One on all commercial
"orn varieties. No rust was observed at other locations. This rust appears to
-..tack plants at the ear denting maturity stage.

Results and Discussion

Significant differences in dry matter production of commercial corn hybrids
were obtained at Ona (Table 1). Dekalb XL 95 was the highest producing variety,

Table 1. Forage production and southern corn rust of commercial corn
varieties grown at the ARC, Ona 1975.

Dry matter Rust
Brand Variety T/A '%

Dekalb XL 95 10.2a1i 15
Asgrow RX-114 9.7ab 37
Funks G4949A 9.6ab 8
Dekalb XL 395 9.3ab 9
Dekalb XL 399 9.2ab 2
Dekalb XL 99 9.2ab 30
Funks G 4864 9.2ab 15
Asgrow RX-132 8.9ab 10
McNair 508 8.7ab 3
Pioneer 3080 8.6ab 42
Coker 77 8.4ab 3
Dekalb XL 394 8.3ab 32
Asgrow RX-450 8.2ab 2
Coker 54 8.2ab 8
Pioneer 3145 8.2ab 10
Pioneer 3193 7.5b 53

1/ Means

with different letters are significantly different at the 5%
according to Duncan's Multiple Range Test.

yielding an average of 10.2 tons per acre, and Pioneer 3193 was the lowest
yielding variety averaging 7.5 tons per acre. The latter variety was the
earliest maturing hybrid in the study, which may partially account for the lowest
dry matter production. However Asgrow RX-114, also a very early maturing variety
yielded 9.7 tons per acre of dry matter.

Southern corn rust infected all corn varieties to varying degrees.
Preliminary information indicates that the rust has little effect on the yield
of corn hybrids. As can be seen from Table 1 little correlation can be obtained
between % rust and dry matter yield of corn hybrids. Southern corn rust ranged
from a high of 53% for the early maturing variety Pioneer 3193 to a low of 2% for
Asgrow RX-450 and Dekalb XL 399. Most early maturing varieties seem to contain
higher rust infestation as compared with the full season hybrids.

Significant differences in dry matter production existed between corn
varieties grown in Orange County (Table 2). Dekalb XL 399 produced the highest

Table 2. Forage production of commercial
grown in Orange County 1975.

corn varieties

Brand Variety Dry matter T/A

Dekalb XL 399 6.9a 1
Dekalb XL 99 6.8ab
Dekalb XL 95 6.7ab
Dekalb XL 395 6.2abc
McNair 508 6.0abcd
Pioneer 3080 6.0abcd
Asgrow RX-450 5.8abcd
Funks : G 4864 5.7abcd
Asgrow RX-132 5.7abcd
Pioneer 3145 5.6abcd
Asgrow RX-114 5,3abcd
Coker 54 5.2bcd
Coker 77 5.2bcd
Pioneer 3193 4.9cd
Dekalb XL 394 4.8cd
Funks G 4949A 4.5d

1/ Means with different letters
at the 5% level according to

are significantly different
Duncan's Multiple Range Test.

dry matter yields averaging 6.9 tons per acre. Funks G 4949A produced the lowest
dry matter yields averaging only 4.5 tons per acre. Yields at this location
were lower when compared with Ona and Manatee County yields due to a severe
drought and the inability to irrigate the entire crop.

Significant differences in forage production also existed among corn hybrids
grown at the Manatee County location (Table 3). Coker 77 yielded the highest dry

Table 3. Forage production of commercial corn varieties
grown in Manatee County 1975.

Brand Variety Dry matter T/A

Pioneer -

XL 399
XL 99
XL 395
XL 95
G 4949A
XL 394
G 4864


1/ Means with different letters
at the 5% level according to

are significantly different
Duncan's Multiple Range Test.

matter averaging 7.9 tons per acre, with only .9 tons separating the top 9
varieties. In this study the early maturing hybrids generally produced the
lowest yields. These varieties sustained considerable ear damage by racoons.
Funk G 4864 sustained considerable lodging. It appeared that the root system
of this variety was insufficient to hold the plants erect under sandy muck

Silage yields of corn varieties grown at the Polk County location were
quite low when compared with yields at other locations. Dry matter yields
ranged from a high of 5.3 tons per acre for Dekalb XL 99 to a low of 2,5 tons
for Asgrow RX-114 (Table 4). These low yields are due entirely to insufficient
irrigation during the critical physiological growth stages. Adequate water was
applied (1.0 inches per week) until the corn attained a height of 18 inches.
At this time mechanical problems developed with the irrigation pump resulting
in no irrigation for the duration of the study. Approximately 1.5 inches of
water per week should have been applied during this stress period.

Grain yields of the sixteen corn varieties grown at the ARC, Ona were
calculated (Table 5). Pioneer 3145 produced the highest yield averaging 166 bu
per acre of 15.5% moisture shelled corn. Only sixteen bu per acre separated the
top 10 corn varieties.

Table 4. Forage production of commercial
grown in Polk County 1975.

corn varieties

Brand Variety Dry matter T/A

Dekalb XL 99 5.3a
McNair 508 4.9ab
Dekalb XL 399 4.8abc
Pioneer 3080 4.5abc
Dekalb XL 95 4.5abc
Dekalb XL 395 4.4abc
Coker 54 4.4abc
Pioneer 3193 4.0abcd
Coker 77 4.0abcd
Pioneer 3145 3.7bcd
Dekalb XL 394 3.6bcd
Funks G.4949A 3.5bcd
Funks G 4864 3.4bcd
Asgrow RX-450 3.3cd
Asgrow RX-132 2.8d
Asgrow RX-114 2.5d

1/ Means with different letters
at the 5% level according to

are significantly different
Duncan's Multiple Range Test.


Commercial corn varieties differ in their yielding ability when grown
at different locations in South Central Florida. Therefore, commercial growers'
should study the performance of corn varieties carefully prior to purchasing
seed of a variety to be grown on ones farm or ranch. To obtain consistently
high yields adequate moisture, fertility, population and management are required.

Grain production of
the ARC, Ona 1975.

commercial corn,varieties grown at

Shelled corn 15.57 moisture
Brand Variety bu/A

Pioneer 3145 166'
Funks G 4864 160
Dekalb XL 399 158
Dekalb XL 99 157
Pioneer 3080 157
Coker 77 156
Asgrow RX-114 154
Dekalb XL 95 150
Dekalb XL 395 150
Asgrow RX-132 150
McNair 508 146
Coker 54 138
Pioneer 3193 136
Asgrow RX-450 134
Funks G 4949A 132
Dekalb XL 394 131

I/ No significant difference among varieties was observed at the 5%
level according to Duncan's Multiple Range Test.

Table 5.

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