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Group Title: Mimeo report - Agricultural Research Center ; RC1972-15
Title: Commercial corn variety testing in south central Florida, 1972
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Permanent Link: http://ufdc.ufl.edu/UF00074246/00001
 Material Information
Title: Commercial corn variety testing in south central Florida, 1972
Series Title: Mimeo report
Physical Description: 8 leaves : ; 28 cm.
Language: English
Creator: Mislevy, P ( Paul ), 1941-
Jones, D. W
Agricultural Research Center, Ona
Publisher: Agricultural Research Center
Place of Publication: Ona FL
Publication Date: 1972
 Subjects
Subject: Corn -- Varieties -- Florida   ( lcsh )
Corn -- Yields -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Paul Mislevy and D.W. Jones.
General Note: Caption title.
General Note: "October, 1972."
Funding: Mimeo report (Agricultural Research Center, Ona) ;
 Record Information
Bibliographic ID: UF00074246
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 85821464

Table of Contents
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Full Text





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






1jp&' Agricultural Research Center, Ona
,) | Mimeo Report RC-1972-15
* *e*


October, 1972


Experimental Procedure


Commercial corn variety testing was carried out in Orange County,

Manatee County, and at the Ona Agricultural Research Center (ARC) during 1972.

The experimental design in Orange and Manatee Counties was a randomized,

complete block with three and four replications, respectively. At the Ona

ARC a split plot design was employed using four replications and two

irrigation levels.

The experiment was planted on IMyakka fine sand February 21 in Orange

County, Ona fine sand February 24 at the Ona ARC, and on a sandy muck

March 24 at the Manatee County site.



1/ Assistant Professor (Assistant Agronomist), Agricultural Research Center,

Ona; and Professor (Agronomist), Agricultural Extension Service, Gainesville.


COMMERCIAL CORN VARIETY f S B FLORIDA, 1972

Paul Mislt and D. J /
and. 0t. 7J a 1I

Corn harvested for silage o grain can be extremely valuable in a
ILFA .. Univ. of Florida
livestock feeding program. The u .nn V- .,f.iLl composition of

corn silage varies with the ratio of grain to stover and maturity stage

at which the plant is harvested. High quality corn silage can be produced

by harvesting the crop when the kernel is in the hard-dent stage.

nell managed corn, harvested at the proper stage of maturity, will

produce 6 to 10 tons of dry matter per acre in approximately 125 days.

However, high fertility, adapted varieties or hybrids, correct plant pop-

ulation, and weed and insect control are necessary. The purpose of this

research was to evaluate a selected number of corn and sorghum varieties

in south and central Florida.







2.

All cultural practices (preparing the seed bed, fertilization,

spraying, cultivation) were conducted by the cooperator at the Orange

and Manatee County locations. Fertilization practices carried out by

the cooperators were 220-120-210 and 30-60-90- pounds of N-P-K per acre

in Orange and Manatee counties, respectively. At Ona 300-150-280 pounds

per acre were applied. All experimental sites contained an adequate

amount of lime. No irrigation was applied at the Manatee or Orange County

locations. However as mentioned earlier, the effect of irrigation vs non-

irrigation was studied at Ona.

Plant population at all three locations was 20,000 plants per acre.

The herbicide used in Orange County was an Aatrex-Lasso combination with

no cultivation. No herbicide was used in Manatee County, however the

experiment was cultivated twice. Two pounds of actual Aatrex per acre

was applied pre-emergence at Ona with no cultivation.

All three locations were planted with the same 13 corn hybrids.

However one additional corn hybrid was planted at Ona. Two grain and two

silage sorghums were planted at the Manatee location. The corn was harvested

for silage when the kernels were at the hard-dent stage, containing

approximately 327. dry matter.

All corn varieties from Orange County and Ona, Tables 1 and 3, were

analyzed for organic matter digestibility. This in vitro organic matter

digestibility (IVOID) procedure is an indication of the amount organic

matter which is digestible by ruminants.


Results and Discussion


Significant differences existed in dry matter yield between varieties

in Orange County, Table 1. However no significant difference in dry

matter production was observed among the top eight varieties. DeKalb XL 85A







3.

produced significantly lower yields when compared with the 8 highest

yielding varieties. Dry matter production of all varieties was severely

hampered by drought stress in the Orange County tests.

Water was not a limiting factor at the Manatee County location. Lack

of fertility and/or uneven fertilizer distribution may have been responsible

for low dry matter yields of many corn and sorghum hybrids in the Manatee

County test, Table 2. The top yielding hybrid was significantly higher

in dry matter production than the 3 lowest yielding varieties, but there

was no significant difference observed between the 11 top producing corn

and sorghum species.

Ho significant differences in silage or grain production were observed

among the commercial corn varieties at the Ona ARC, Tables 3 and 4. The

percentage of plants lodged following 30 to 40 mile-per-hour wind gusts

during Hurricane Agnes are presented in Table 4. They ranged from 0%

plants lodged for Funk G 5757 to 44% of the plants lodged for Pioneer 3009.

During the 1972 growing season, moisture distribution was quite

favorable at Ona, Table 6. The lowest monthly total rainfall was 1.39

inches coming during the month of March. Irrigation had no beneficial

effect on grain or silage production during the 1972 growing season, Table

5. Total dry matter production was significantly higher for the non-

irrigated treatment.

Digestibilities differed slightly from location to location. In

Orange County the IVOMD ranged from 73.2% for DeKalb XL 85A to 69.0% for

Pioneer 3030, while at Ona the IVOID was somewhat lower, ranging from

65.7% for DeKalb XL 379 to 60.7% for Coker 71.












Table 1. Silage production and in vitro organic matter digestibility
of commercial corn varieties in Orange County.


Total
dry matter
produr.tion
tons;/A

6.7

6.5

6.2

6.2

6.1

5.9

5.7

5.6

5.5

5.2

4.7

4.5

3.9


1.4

18


Total green
yield-tons/A

18.2

17.7

16.8

17.0

17.3

12.2

14.8

14.2

14.0

16.8

11.8

11.8

9.2


4.6

24


Brand

MlcNair

PGA

Pioneer

Funk G

Coker

IcNair

DeK'alb

Pioneer

DeKalb

Funk

Funk

DeKalb

DeKalb


Variety

508

751

3030

4949

71

X210

1214

3009

XL389

G5940

G4761

XL379

XL85A


IVOMD (%)

70.1

71.7

69.0

70.3

70.6

70.7

69.8

69.9

69.3

69.2

70.2

71.6

73.2


LCD (.05)

C.V. (%)


- -- --- --~-- --~- -- --









5.



Table 2. Silage production of commercial corn and sorghum varieties
in Manatee County.


Brand

Asgrow

DeKalb

Funk

NK

NI

Funk

Lindsey

Pioneer

McNair

DeKalb

PGA

McNair

DeKalb

Coker

Funk

Pioneer

DeKalb


LSD (.05)

C. V. (.%)


Total
dry matter
production
tone/A

5.1

4.9

4.7

4.3

4.2

4.2

4.1

4.1

4.0

3.8

3.5

3.4

3.4

3.3

2.8

2.7

2.3


2.2

40


Variety

Titan R*

1214

G5940

Savanna**

300*

G4949

79**

3030

508

XL85A

751

X210

XL379

71

G4761

3009

XL389


5.3

38


* Silage sorghum
** Grain sorghum, harvested


for silage


Total green
yield tons/A

16.3

13.9

12.5

16.5

15.2

12.8

14.6

11.5

11.6

10.1

10.6

9.0

9.0

10.7

7.6

7.9

7.7


--~--- --~---- --- --- -- --- ~---












Table 3. Silage production and in vitro organic matter digestibility
of commercial corn variatics at the Ona ARC.


Total
dry matter
production
tons /A

7.2

7.2

7.1

7.1

7.0

7.0

6.7

6.7

6.7

6.6

6.6

6.5

6.4

6.2


Total green
yield tons/A

22.3

21.2

21.2

21.0

24.7

22.3

22.4

21.6

19.0

21.7

20.7

21.6

20.9

22.2


NS

14.


Brand

McNair

Funk

Funk

Funk

Pioneer

DeKalb

DeKalb

McNair

PGA

Coker

Pioneer

Funk

DeKalb

DeKalb


Variety

508

G5757

G5940

G4949

3009

1214

XL389

X210

751

71

3030

G4761

XL379

XL85A


IVoI0r (%)

63.5

64.0

62.7

62.7

61.2

62.3

63.5

62.7

61.8

60.7

62.5

64.3

65.7

64.1


LSD (.05)

C.V. (7)


- -- -- ---- ---1--- -.---













Table 4. Grain production and lodging resistance of selected commercial
corn varieties at the Ona ARC.


Shelled corn,
15% moisture bu/A

142.4

126.6

124.6

121.3

119.6

119.6

118.5

114.0

111.3

108.0

103.6

103.1

102.8

102.3


Lodging


35

12

24

2

4

5

0

26

12

6

5

12

44

29


NS

19.


Variety

X210

I3L85A

XL389

1214

71

G4949

G5757

G4761

XL379

G5940

3030

508

3009

751


Brand

McNair

DeKalb

DeKalb

DeKalb

Coker

Funk

Funk

Funk

DeKalb

Funk

Pioneer

McNair

Pioneer

PGA


LSD (.05)

C. V. (7.)


----- --- -- --- --- -- --











Table 5. Average silage and grain production of 14 corn varieties as influenced
by irrigation at the Ona ARC.


Total dry matter Total green Grain production
Treatment production-tons/A yield-tons/A bu/A

Irrigated 6.6 21.8 117.9

Itfr-trrtgated 6.9 21.5 114.9


LSD (.05)

C. V. (7.)


.2

14.


NS

13.


NS

19.


Table 6. Rainfall- distribution over a
| ,


five month growing period at Ona ARC.
,, = .. .


1971


Monthly Maximum Monthly Maximum 29 year
Month Total Daily Total Daily average

February 4.00 1.28 3.34 .91 2.50

March 1.39 .57 .99 .43 3.24

April 4.25 2.65 .09 .07 2.59

May 2.51 .91 3.06 1.28 4.00

June 7.23 3.90 5,67 2.50 8.48


October 20, 1972
RC-1972-15; 200


aE~l~a~ re ~


I ____ -~-~-~~pe


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