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represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
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Copyright 2005, Board of Trustees, University
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F636m1

Agronomy Research Report AY 80-2 September 1979

0 o-a

Department of Agronomy
Agriculture Experiment Station, IFAS
University of Florida
Gainesville, Florida

REPORT OF YIELD DATA FOR SELECTED TREATMENTS AND EXPERIMENTS CONDUCTED
AT WILLISTON, FLORIDA IN 1979.

Raymond N. Gallaher, Associate Professor of Agronomy, Institute of food
and Agricultural Sciences, University of Florida, Gainesville, Florida.

After three years of Multicropping/Minimum tillage systems research we
have a significant data base from which we can begin to select out and advise
farmers on profitable systems. For the past two years we have conducted num-
erous minimum tillage systems research studies on the Robinson farm at Williston,
Florida. The data reported here is from several of these investigations in
1979.

Time did not allow us to conduct statistical analysis of data in the var-
ious studies. However, yield and plant population trends should be meaningful
to participants. No attempts will be made in this document to interpret the
data. In depth discussions about each experiment will be conducted at the
27 September, 1979 field day.

Special acknowledgement for support and cooperation is extended to Mr.
R.G. Weeks, my personal research assistant. Appreciation is also extended
to Ms. Jan Ferguson, Mr. Raymond Robinson, his family, and employees, Mr.
John A. Baldwin, area custom applicators and harvesters and Industry repre-
sentatives who supported the research reported herein.

Experiment #1.No-Tillage Corn (Funks G4507) planted into 1978 soybean
residue. Soybeans were planted No-Tillage in-row subsoil in 1978 with
either roundup or paraquat treatments.

TREATMENT

Yes

1978 Roundup treatment

1978 Paraquat treatment

IN ROW SUBSOIL
No
Yield bu/A

Average

PLANT POPULATION AT HARVEST

1978 Roundup treatment

1978 Paraquat treatment

Average

20,746

20,177

20,462

22,034

14,025

18,030

21,390

17,101

Experiment #2. In-row subsoil versus slot coulter planted corn in
bermudagrass pasture sod. Influence of variety and post direct contact
herbicides on yield.

POST DIRECT
Cultivar Subsoil Paraquat Roundup Average
bu/A @15.5% moisture
DEKALB XL. 12 YES 59 80 70
NO 58 52 55
X 59 66

PIONEER 3958 YES 83 69 76
NO 40 63 52
X 62 66

PLANT POPULATION/ACRE

DEKALB XL 12

PIONEER 3958

YES
NO
X

YES
NO
X

18,958
17,825
18,392

29,640
27,017
28,329

23,577
19,712
21,645

25,996
29,614
27,805

21,268
18,769

27,818
28,316

Average

Experiment #3. Yield of corn after two years of minimum tillage
management. Yield reported @ 15.5% moisture.

1979
Yield bu/A

1. Rye mulch + in-row subsoil in 1978

Cornstalk-soybean
Dekalb XL 72b

2. Rye mulch in 1978
Cornstalk-soybean
Dekalb XL 72b
3. Rye stubble after
Cornstalk-soybean
Funks G 4507
4. Rye stubble after
Cornstalk-soybean
Funks G 4507
5. Rye stubble after
subsoil in 1978
Cornstalk-soybean
subsoil in 1979
Funks G 4507
6. Rye stubble after
Cornstalk-soybean
Funks G 4507

residue + in-row subsoil in 1979

residue in 1979

hay + in-row subsoil 1978
residue + in-row subsoil in 1979

hay in 1978
residue in 1979

hay Conventional tillage + in-row

residue Conventional tillage + in-row

hay Conventional tillage in 1978
residue Conventional tillage in 1979

Experiment #4. Drilled soybeans into wheat, rye, and oat straw, into
vetch and other variables.

Wheat yields averaged about 30bu/A, rye about 20bu/A and oats about
55bu/A. Drilled soybeans were planted with a sod seeding drill directly
into the straw residue following harvest of grain. Plot size in 30ft X
30ft. It can be noted that some plots are almost weed free. These plots
are where we had a good small grain straw residue and where we obtained
good soybean stands.
Some of the plots received an early post over the top application
of BASAGRAN which significantly reduced weed competition over non BASAGRAN
plots. Proper herbicide application and plant competition should make
drilled soybeans a profitable venture.
About 100 pounds "Cobb" soybeans were planted. A tank-mix of 1 1/2
pints PARAQUAT plus 2 pounds active ingredient LASSO plus 0.4 pounds
active ingredient LEXONE plus 1/2 pint ORTHO X77 per gallons of water
was applied during the planting operation.

TREATMENT

Experiment #5. Sorghum (Dekalb BR 54) and Soybeans (Cobb) double
cropped following rye for grain. Influence of in-row subsoil,
coulter slot planting and drill treatments into rye straw without
prior tillage. Rye yield was 17bu/A. Sorghum yield data is presented
below.

TREATMENT Yield bu/A Plant Pop. Plant Height in.

In-row subsoil into straw 82 120,226 62

Coulter slot plant into straw 80 106,285 61

Drill plant into straw 81 137,204 61

Herbicide- 1 1/2 pints paraquat plus 1/2 pint ortho X77 at planting.
1 1/2 #a.i. Atrazine plus 1/2 pints oil when sorghum was
6-8in. tall.

Nitrogen- 150 pounds/Acre when sorghum was 3-4 inches tall.

Experiment #6. Yield and population of corn planted into rye stubble
by an in-row subsoil planter without prior tillage. Initial seeding
rate was 30,000 to 35,000 per acre. A heavy infestation of cutworms
selectively damaged some cultivars over others. Pioneer 3145 appeared
to be most resistant. Rye hay yield was 2ton per acre.

YIELD bu/A @ 15.5% AVERAGE #/A
CULTIVAR AVERAGE RANGE PLANTS EARS

Pioneer 3145 89 54-126 20,046 17,142
Dekalb XL72b 67 21-103 17,100 14,171
NK 75-200 62 29-95 17,351 13,645
Funks G4507 61 39-108 15,426 12,689
Pioneer 3369A 59 30-130 12,070 13,811
JX 180 58 32-99 16,070 13,811
Pioneer 3965A 46 20-102 14,608 13,599
Dekalb XL18 42 15-80 10,960 9,974
Pioneer 3780 35 8-52 7,657 6,930
NK PX20 34 19-58 8,535 7,622
Pioneer 3958 25 7-48 7,787 7,117
Dekalb XL58 21 1-51 7,174 6,015

Experiment #7. Yield and population of corn and grain sorghum planted
in rye that was killed for a mulch as influenced by in-row subsoiling
versus slot coulter planting.

IN ROW
CULTIVAR SUBSOIL SLOT DIFFERENCE
CORN Yield bu/A
Dekalb XL72b 153 110 42
Funks G4507 142 84 58
Pioneer 3958 131 58 73
Pioneer 3145 128 103 25
Dekalb XL12 105 54 51
Pioneer 3965A 92 68 24

Sorghum
Grower ML135 95 76 19
Dekalb BR54 82 64 18

Population/Acre
CORN
Dekalb XL72b 22,353 18,861 3,492
Funks G4507 24,259 22,519 1,740
Pioneer 3958 33,462 18,880 14,582
Pioneer 3145 20,264 18,973 1,291
Dekalb XL12 22,539 15,108 7,431
Pioneer 3965A 25,329 20,845 4,484

SORGHUM
Grower ML135 83,635 47,045 36,590
Dekalb BR54 128,938 116,741 12,197

DEMONSTRATION CORN GROWN BY RAYMOND ROBINSON AND FAMILY IN 1979

YIELD*
CULTIVAR bu/A @15.5% Ton DM/A PLANTS/A PLANT Ht. in.

FUNKS G4507 212 13.8(39)*** 33,675 120
PIONEER 3369A 196 13.3(38) 30,400 125
COKER 19 189 15.7(45) 36,725 123
DEKALB XL72b 175** 14.3(41) 36,675 121
MIXTURE 181** 14.6(42) 30,288 120

AVERAGE 191 14.3(41) 33,553 122

*Yield estimates were made by hand harvesting eight 1/200th of an acre
areas at random throughout the five acre demonstration plots.
**These plots received 30 pounds less nitrogen fertilizer per acre.
***Forage tonnage at 35% dry matter.
Whole plants were sampled for dry matter accumulation from early
tassel on May 17 until July 10. Other measurements were also made such
as nitrogen and mineral uptake. Approximately 72% of total dry matter
was accumulated during the seven week period from early tassel to bl~ck
layer formationOf the approximately 300 pounds/A nitrogen taken up by the
corn,47 to 53% of this (about 150 pounds/A) was taken up after tasseling.

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