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Title: No-tillage corn results affected by hybrids and pesticides in 1984 at the Green Acres Agronomy Farm
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Permanent Link: http://ufdc.ufl.edu/UF00056087/00001
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Title: No-tillage corn results affected by hybrids and pesticides in 1984 at the Green Acres Agronomy Farm
Series Title: Agronomy research report
Physical Description: 8 leaves : ; 28 cm
Language: English
Creator: Gallaher, Raymond N
Baldwin, John A
University of Florida -- Agronomy Dept
Publisher: Agronomy Department, IFAS, University of Florida
Place of Publication: Gainesville Fla
Publication Date: 1985?]
 Subjects
Subject: Hybrid corn -- Growth -- Florida   ( lcsh )
Corn -- Diseases and pests -- Control -- Florida   ( lcsh )
No-tillage -- Florida   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
Statement of Responsibility: by Raymond N. Gallaher and John A. Baldwin.
General Note: Caption title.
 Record Information
Bibliographic ID: UF00056087
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 62394567

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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














Agronomy Research Report AY-85-08


No-Tillage Corn Results Affected by Hybrids and Pesticides
in 1984 at the Green Acres Agronomy Farm.
HUME LIBRARY
By
JUN 12 i985 / By
Raymond N. Gallaher and John A. Baldwin
1.F.A.S Uiv. of i fessor and Graduate Student, Agronomy Department,
A.S.- Univd. o df i d of Food And Agricultural Sciences, University of Florida
Gainesville, Florida 32611




INTRODUCTION

Seven No-tillage research studies comparing corn hybrids were initiated in
1984 on the Agronomy Research Farm 12 miles west of Gainesville, Florida. Data
was not collected from three of these studies for various reasons. However, data
was collected from four of the studies and is presented in this report. The
objectives of this research were to 1) evaluate temperate and tropical corn
hybrids for yield and 2) to evaluate the differential response of hybrids to
pesticides.

MATERIALS AND METHODS

See materials and methods after the tables.

RESULTS

Tropical versus Temperate hybrid test

This is the second year to evaluate yield potential of tropical hybrids when
planted in March. Data is presented in Tables 1 and 2. Note that no significant
grain yield differences were found among the six tropical hybrids. The two
temperate hybrids in the test ranked lowest in grain yield. This may be due to
the late planting date of March 26.

Temperate test

Eight of the 10 hybrids in this test were Asgrow (Table 3). Pioneer X304-C, a
tropical hybrid was included in the test. Note that the grain yield of Pioneer
X304-C ranked at the bottom while Asgrow 114 had a 1643 kg/ha higher yield.
The planting date in this study was March 9 which was 17 days earlier than the
experiment reported in Tables 1 and 2. In the former case Pioneer X304-C
outyielded Asgrow 114 by 2616 kg/ha. Data from these two experiments and data
from previous years indicate that tropical hybrids have a yield advantage for
late plantings which corn breeders and management specialists should continue to
investigate.













Pesticide test


Two early planted pesticide/hybrid experiments were lost due to technical
problems in 1984. However, two late summer planted pesticide test comparing
two tropical corn hybrids were successful (Tables 4-6). In an experiment of corn
following rye grain the corn grain yields were very good (Table 4). Both hybrids
responded to application of Furadan and Counter compared to the control plots.
Although there were no differences between pesticides or rates of Furadan there
was a trend for the 2.24 kg/ha active ingredient Furadan to give the best
response. In this test Pioneer X304-C gave the highest grain and whole plant
yield but residue yields were equal between the hybrids. The grain/residue ratios
seem to indicate that Pioneer X304-C was more efficient in partitioning
photosynthate into the grain.
In the pesticide/hybrid study following corn grain in the same warm season
(Table 6) the corn did not appear to grow with as much vigor as in the study
with corn following rye (Table 4). Whole plant data shows that yields were equal
for the two hybrids (Table 6). Both hybrids gave higher whole plant yields from
use of Furadan than from Counter and Counter better yields than the control.
Grain yield data was not collected in this experiment.
Army worm damage seemed to be greater on the corn following corn as
compared to the experiment with corn following rye. In both experiments it
appeared that more plants were lost due to insects in the control plots compared
to treated plots.

ACKNOWLEDGMENTS

The authors express appreciation for the technical assistance of Mr. Sonny R.
Tompking and Mr. Bill Carter.








*


SHeight
Plants/Ha Ears/Ha To Flag Top of Tassel


Hybrid


No cm
DeKalb EXA816 68760 a 75853 200 ab 243 a
Asgrow A667 W 74102 a 70474 206 a 253 a
Pioneer B X304C 76279 a 76391 198 ab 245 ab
Pioneer B YOM06 70909 a 66977 203 ab 247 ab
DeKalb EXA815 78430 a 76929 190 ab 236 ab
Pioneer B YOM03 67685 a 63480 199 ab 241 ab
DeKalb DK747 62313 a 70474 189 ab 240 ab
Asgrow RX114 71983 a 72087 182 b 222 b

B = Brand. W = White. Values in columns not followed by the same letter are
significantly different at the 0.05 level of probability according to Duncans
Range test.


Table 1. Corn yield and other variables in an early planted (March 26, 1984)
tropical versus temperate hybrid no-tillage study at Green Acres, Agronomy
Farm, IF AS, UF.

Hybrid Grain Residue Total Plant Grain/Stalk Shellng

-Kg/Ha- Bu/A -Kg/Ha- -Kg/Ha- Ratio % -
DeKalb EXA816 6384 a 128 6122 ab 14160 a 1.04 79.5 b
Asgrow A667 W 6241 ab 125 6128 ab 13707 ab 1.01 82.3 a
Pioneer B X304C6211 ab 124 6782 a 14411 a 0.92 81.5 ab
Pion B YOM06 5637 ab 113 5285 b 12338 abc 1.07 79.8 ab
DeKalb EXA815 5258 abc 105 5221 b 11794 abc 1.00 80.0 ab
Pion B YOM03 4750 abc 95 5353 b 11196 c 0.89 81.3 ab
DeKalb DK747 4491 bc 90 5383 b 10843 c 0.83 82.3'a
Asgrow RX114 3595 c 72 5585 b 9969 c 0.64 82.0 ab

Pion B = Pioneer Brand. W = white. Grain yield at 15.5 % moisture, residue and
total plant yields are based on dry matter. Values in columns not followed by the
same letter are significantly different at the 0.05 level of probability according
to Duncans Range test.








Table 2. Characteristics of early planted (March 26, 1984) tropical versus
temperate corn hybrids in a no-tillage study at the Green Acres Agronomy Farm,
IFAS, UF.









Table 3. Corn yield and other variables in a temperate hybrid no-tillage test
planted (March 9, 1984) at Green Acres, Agronomy, IFAS, UF.

Hybrid Grain Residue Total Plant Grain/Stalk

-Kg/Ha- Bu/A -Kg/Ha- -Kg/Ha- Ratio
Asgrow 2570 9815 a 156 6145 ab 15960 a 1.60
Asgrow 777 9282 ab 148 5125 ab 14407 abc 1.81
Asgrow 5509 8451 bc 137 6100 ab 14550 abc .1.39
Asgrow 114 8418 bc 136 6392 ab 14810 ab 1.32
Asgrow 864 8107 bcd 129 5599 ab 13707 abcd 1.45
Asgrow 909 7726 cd 123 4510 b 12236 bcd 1.71
Pioneer B 3389 7631 cd 121 5864 ab 13496 abcd 1.30
Asgrow 2148 7022 cd 112 4655 b 11678 cd 1.51
Asgrow 610 6843 d 109 4361 b 11204 d 1.57
Pioneer B X304C 6775 d 108 6760 a 13534 abcd 1.00

B = Brand. Grain Yield at 15.5% moisture, residue and total plant yields are
based on dry matter. Values in columns not followed by the same letter are
significantly different at the 0.05 level of probability according to Duncans
Range test.

Materials and methods for Experimental Data Reported in Tables 1-3.


Cropping systems: Corn proceeding corn in same warm season.

Experimental design: Corn hybrids were tested for yield in a randomized
complete block (RCB) with five replications (Tables 1-2) or four replications
(Table 3).

Tillage/planting: Rows were played off into untilled plots with a no-tillage plus
subsoil Brown-Harden planter. 98,000 seed/ha were planted by hand into rows
played off by no-tillage planter.

Fertility: Injected 112 kg N/ha, as anhydrous ammonia, 25 cm under the corn row
with the no-tillage subsoil planter. Broadcast 225 kg 0-0-48/ha and 225 kg
6-11-34 containing S, Mg, and micronutrients prior to planting. Sidedressed with
60 kg/ha N as ammonium nitrate when corn was about 60 cm tall.

Pest control: Preemergence application of 3.78 L of Bronco. Post directed first
with .5 kg/ha active ingredient 2,4D plus 1.12 kg/ha active ingredient Lorox then
again 10 days later with .15 kg/ha active ingredient paraquat plus recommended
rate of X77 surfactant. Applied 2.2 kg/ha active ingredient Furadan in the row
at planting.

Harvest: Ears and whole plant yield and other data was taken on July 20, 1984
from 9.5 square meters in each plot. Samples were dried in a forced air oven at
70 C and yield data calculated. Grain yields were corrected to 15.5 % moisture.

Irrigation: Experiments were irrigated using overhead sprinklers.

Statistics: ANOVA for a RCB and Duncans Multiple Range Test.










Table 4. Whole plant, residue, and grain yields and other variables in no-tillage
planted (July 24, 1984) corn double cropped after rye grain as affected by
pesticide at Green Acres, Agronomy Farm, IFAS, UF.


Active
Pesticide Ingredient

-Kg/Ha-
Furadan 2.24
Furadan 1.12
Counter 2.24


Check

Average



Furadan
Furadan
Counter
Check

Average


Furadan
Furadan
C ounter
Check

Average


Furadan
Furadan
C ounter
Check

Average


Furadan
Furadan
C ounter
Check

Average


P-Brand Asgrow Average P-Brand Asgrow Average
X304C 670 X304C 670
Whole Plant Dry Matter
Kg/Ha -Ton/A
12700 11500 12100 a 5.65 5.12 5.39 a
12300 10400 11400 ab 5.47 4.63 5.08 ab
10900 10100 10500 ab4.85 4.50 4.67 ab
10700 8500 9600 b 4.76 3.78 4.27 ; b


11700 10100 *


-Kg/Ha-
2.24
1.12
2.24


5.21


4.50 *


Plant Residue Dry Matter
Kg/Ha Ton/A
6440 7080 6760 a 2.87 3.16 3.02 a
5890 6430 6210 ab 2.63 2.87 2.77 ab
5220 6160 5690 ab 2.33 2.75 2.54 ab
5430 5000 5210 b,2.42 2.23 2.32 b


5790 6140 NS


-Kg/Ha-
2.24
1.12
2.24


6260
6410
5680
5270


Kg/Ha
4420
3970
3940
3500


5910 3960 *


-Kg/Ha-
2.24
1.12
2.24




-Kg/Ha-
2.24
1.12
2.24


.97
1.09
1.09
.97

1.03


1.59
1.92
1.68
1.68


1.71


Grain/Residue -
.62 .80 a
.62 .86 a
.64 .87 a
.70 .84 a

.65 *


Ear/Stalk
.96
.92
.96
1.12


5340 a
5190 a
4810 ab
4390 b


2.58
Grain -
i
100
102
91
84


2.74 NS


Bu/A
70
63
63
56


85 a
83 a
77 ab
70 b


94 63 *


49
52
52
49

51


% Grain
38
38
39
41


44 a
45 a
46 a
45 a


39 *


1.28 a
1.42 a
1.32 a
1.38 a


.99 *


P = Pioneer. Values in columns not followed by the same letter are significantly
different at the 0.5 level of probability according to Duncans Multiple Range
Test. = significant and NS = nonsignificant difference between corn hybrids at
the 0.05 level of probability according to F test.


---











Table 5. Plant and ear numbers and plant height for no-tillage planted (July 24,
1984) corn double cropped after rye grain as affected by pesticide at Green
Acres, Agronomy Farm, IFAS, UF.


Active
Pesticide Ingredient


P-Brand Asgrow Average
X304C 670


P-Brand Asgrow Average
X304C 670


No Plants


Furadan
Furadan
C ounter
Check

Average


-Kg/Ha-
2.24
1.12
2.24


58500
55800
52100
49800


Plants/Ha
43000 50800 a
37700 46800 ab
34600 43400 ab
29600 39700 b


54100 36200 *


23700
22600
21100
20200


Plants/A
17400
15300
14000
12000


20600 a
18900 ab
17600 ab
16100 b


21900 14700 *


57200
55800
51800
47100


Ears/Ha
40700 49000
37700 46800
33300 42600
30600 38900


53000 35600 *


Cm
217 220
223 225
215 235
221 225


-- Plant

219 a
224 a
225 a
223 a


226 *


No Ears

a 23200
a 22600
ib 21000
b 19100


Ears/A
16500
15300
13500
12400


19800 a
18900 a
17200 ab
15700 b


21500 14400 *
Height
In
85.4 86.4 86.2 a
87.6 88.6 88.2 a
84.8 92.6 88.6 a
87.0 88.4 87.8 a


86.2


89.0 *


P = Pioneer.


Values in columns not followed by the


same letter are significantly


different at the 0.05 level of probability according to Duncans Multiple Range
Test. = significant difference between hybrids at the 0.05 level of probability
according to F test.


-Kg/Ha-
2.24
1.12
2.24


Furadan
Furadan
C ounter
Check

Average


Furadan
Furadan
C ounter
Check

Average


-Kg/Ha-
2.24
1.12
2.24


219










Materials and Methods for Experimental Data Reported in Tables 4 and 5.


Cropping system: Corn succeeding rye grain.

Experimental design: Two corn hybrids, Pioneer Brand X304-C and Asgrow 670
were whole plots and Pesticide type and rate were splits, replicated five times
in a randomized completed block for whole plots.

Tillage/planting: No-tillage plus subsoil with Brown-Harden Planter directly into
the decaying rye residue on July 24, 1984.

Seeding population: 75,000 seed/ha.

Pesticide application: By hand over the row.

Fertility: Injected 112 kg N/ha, as anhydrous ammonia, 25 cm under the corn row
during seeding. Broadcast 225 kg 6-11-34 containing Mg, S and minor elements/ha
before planting. Broadcast 40 kg N/ha as ammonium nitrate over the top of corn
when it was about 25 cm tall.

Weed control: Applied .5 kg/ha active ingredient Roundup and .5 kg/ha active
ingredient 2-4D over rye straw on July 4, 3 weeks before planting. Applied 2.2
kg/ha active ingredient Lasso, 2.2 kg/ha active ingreding Atrazine, and .30 kg/ha
active ingredient Paraquat (including recommended rate of X77) on July 24
immediately after planting. Post directed. with .15 kg/ha active ingredient
paraquat (including recommended rate of X77) when corn was about 65 cm in
height.

Irrigation: Water was applied by overhead sprinklers.

Harvest: Whole plants and ears were harvested from 7.5 sq meter areas in each
plot on 11/20/1984. Samples were dried in a forced air oven at 70 C and dry
matter yields calculated for whole plant data. Grain yield was corrected to 15.5
% moisture.

Statistics: ANOVA for split plot and D.uncans Multiple Range Test.










Table 6. Whole plant dry matter yield in no-tillage planted (August 10, 1984)
corn double cropped after corn as affected by pesticide and hybrid at Green
Acres, Agronomy Farm, IFAS, UF in 1984.

Active P-Brand Asgrow Average P-Brand Asgrow Average
Pesticide Ingredient X304C 670 X304C 670
Whole Plant Dry Matter
-Kg/Ha- Kg/Ha Ton/A
Furadan 2.24 2457 2511 2484 a 1.09 1.11 1.10 a
Furadan 1.12 2149 2901 2525 a 0.96 1.29 1.13 a
Counter 2.24 1880 1934 1907 b 0.84 0.86 0.85 b
Check 1047 994 1021 c 0.47 0.44 0.46 c

Average 1883 2085 NS 0.84 0.93 NS

P = Pioneer. Values in columns not followed by the same letter are significantly
different at the 0.05 level of probability according to Duncans Multiple Range
Test. NS = no significant differences between hybrids at the 0.05 level of
probability according to F test.

Materials and Methods for the Experimental Data Reported in Table 6.


Cropping system: Corn succeeding corn in the same warm season.

Experimental design: Two corn hybrids, Pioneer Brand X304-C and Asgrow 670
were whole plots and Pesticide type and rate were splits, replicated four times
in a randomized complete block for whole plots.

Tillage/planting: No-tillage plus subsoil with Brown-Harden Planter directly into
the corn residue of the previous crop on August 10, 1984.

Seeding population: 75,000 seed/ha.

Pesticide application: By hand over the row.

Fertility: Injected 112 kg N/ha, as anhydrous ammonia, 25 cm under the corn row
during seeding. Broadcast 225 kg 6-11-34 containing Mg, S and minor elements/ha
before planting. Broadcast 40 kg N/ha as ammonium nitrate over top of corn
when it was about 25 cm tall.

Weed control: Applied 3.78 L Bronco, containing Roundup and Lasso, plus 2.2
kg/ha Atrazine before planting. Post directed with .15 kg/ha of paraquat
(including recommended rate of X77) when corn was about 65 cm in height.

Harvest: Whole plants were harvested from an 7.5 sq meter area on 11/20/1984.
Samples were dried in a forced air oven at 70 C and dry matter yields
calculated.

Irrigation: Water was applied by overhead sprinklers.

Statistics: ANOVA for a split plot and Duncans Multiple Range Test.




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