2017 NW Iowa Research

Farm and On-Farm Project

Results

2018 Crop Advantage Series

Joel DeJong, ISU Extension Field Agronomist

Andrew Weaver, On-farm coordinator, NW Research Farm

http://farms.ag.iastate.edu/content/northwest-research-and-

demonstration-farm

NW Iowa On-Farm Projects

On-farm project coordinator

- Andrew Weaver

2017 Cooperators who completed projects:Gary TreiDordt College - Mike SchoutenSteve AbmaWes & Wade DeGrootRodney & Ross MoglerRuss GladeDean MeyerBruce ZomermaandDave RossmanSteve AgarMorris Metzger & Marty Knobloch

Iowa Fungicide Efficacy Trials - 2017

NWRF

SWRFSERF

NERFNRF

A&AE

-40.00

-30.00

-20.00

-10.00

0.00

10.00

20.00

30.00

40.00-40.00

-30.00

-20.00

-10.00

0.00

10.00

20.00

30.00

40.00

-40.00

-30.00

-20.00

-10.00

0.00

10.00

20.00

30.00

40.00

Corn Fungicide Summary 2010-2016

V5-V6 (N=168)Mean = 0.4 bu/A

VT-R2 (N=N= 287)Mean = 3.5 bu/A

V5-6 + VT-R2 (N=N= 287)Mean = 3.5 bu/A

Location x Timing 2010-2016

Boone NERF NRFa NWRF SERFb SWRFb

V5-V6 1.3 (N=37)

3.9 (N=31)

0.5 (N=24)

-0.6 (N=31)

-3.1 (N=20)

1.2 (N=25)

VT-R2 0.9 (N=60)

6.1 (N=52)

3.4 (N=40)

5.2 (N=53)

3.0 (N=38)

2.1 (N=43)

V5-V6 + VT-R2

-0.2 (N=32)

5.1 (N=32)

3.5 (N=25)

7.7 (N=31)

0.2 (N=20)

2.7 (N=26)

a No 2010 datab No 2016 data

2017 Effect of timing on disease severity

NS

V5 application NO effect on disease

Up1-9

NWRF NRF NERF AEA SWRF SERF

Hybrid P0157AMXMycogen

2A627P0157AMX P0969AM P0937AM P1197AMXT

GLS score 4 6 4 3 5 5

Yield check 224.8 257.4 234.9 248.5 216.0 269.0

Overall -2.3 1.9 1.2 4.7 -0.9 18.6

V5 0.0 4.9 -0.8 3.1 -6.1 15.6

R1 -3.7 2.2 1.5 7.0 1.4 19.2

V5+R1 -0.3 -2.9 0.8 0.0 -5.0 19.3

V12 -1.8 5.2 2.5 4.1 1.0 17.8

Effect of timing on yield response

ALL non-significant P<0.1

-8

-6

-4

-2

0

2

4

6

8

Corn Fungicide, NW Iowa, V-6 to V-8 stage, 2010 - 2016

Treated minus

Untreated, Bu/A

N = 30

AVE. = 0.53 bu/a

-5

0

5

10

15

20

25

Corn Fungicide, NW Iowa, Ground Application, 2008 - 2016

Treated minus

Untreated, Bu/A

N = 42

Average = 5.82 bu/a

Can fungicides improve standability?

Treatments

Fungicide applied: 1. Yes (Headline Amp 10 oz/A)

2. No

Harvest date: 1. Slightly early2. ~1 week later3. ~2 weeks later4. ~3 weeks later5. ~ 4 weeks later

Effect of harvest date on lodging - 2017

0

5

10

15

20

25

30

35

40

45

NWRF NRF NERF AEA SWRF SERF

Lod

gin

g (%

)

a

b

d

cc

a

b

d

bccd

a

b

dcbc

a

b

cc

ab

c

dd

a

bc

cd

a

b

d

Effect of fungicide on lodging - 2017

0

5

10

15

20

25

30

35

40

NWRF NRF NERF AEA SWRF SERF

Lod

gin

g (%

)

No fungicide Fungicide

a

b

a

b

a

b

a

b

NS

NS

2017 Soybean

Fungicide Trial

• Sioux County, Aproach fungicide

• No-till, planted 5-13-17, 4 reps

• Treated: 63.47 bu/a ave

• Untreated: 63.59 bu/a ave

13

Summary data from 60 Soybean

Fungicide Trials, through 2017• Overall average:

– Treated = 64.73 bu/a

– Untreated = 62.37 bu/a

• Other notes of interest:

– None had the treated more than 1 bu/a less

– 16 had more than a 3 bu/a increase with

fungicide (27%)

– 5 total Monona County trials, 4 had a greater

than 3 bu/a increase

14

Sites were located in included Osceola, Lyon, Osceola, Buena Vista, Clay and Monona counties

NW Iowa Row Spacing Trials

Current ResearchLocation Year Site

YearTarget Seeding Rate(1000 sds/ac)

Hybrid

Sac County 2009 1 30, 35, 40 DeKalb 61-69

Sac County 2009 2 30, 35, 40 DeKalb 61-69

Sac County 2010 3 30, 35, 40 Mycogen 2A551

Sac County 2010 4 30, 35, 40 Mycogen 2J597

Lyon County 2014 5 30, 36, 42 Pioneer P0193 & P0297

Lyon County 2015 6 30, 36, 42 Pioneer P0157 & P0297

O’Brien County 2015 7 30, 36, 42 DeKalb 52-84 & 53-36

O’Brien County 2015 8 30, 36, 42 Pioneer P0157 & P0297

O’Brien County 2016 9 30, 34, 38, 42 DeKalb 52-84 & 53-36

O’Brien County 2016 10 30, 34, 38, 42 Pioneer P0157 & P0297

**

***

20” 30”

20” 30”

30”

20”

4.9 bu/a*

16.2 bu/a*

9.3 bu/a*

1.4 bu/a

-2.0 bu/a

7.9 bu/a*

* = statistically significant

Lyon – 2014 Lyon 2015 NWRF 2015 NWRF 2015 NWRF 2016 NWRF 2016

30 in.20 in.

2017 Soybean

Population Trials

• Osceola County, conventional, planted 5/13, 30”

rows

125K = 70.4 bu/a 150K = 69.9 bu/a 175K = 70.1 bu/a

• Sioux County, no-till, planted 5/11, 30” rows

90K = 73.6 bu/a 130K = 74.3 bu/a

110K = 73.9 bu/a 150K = 75.8 bu/a

19

Soybean Plant Population Trials

37 trials through 2016

125K average = 57.3 bu/a

175K = 57.6 bu/a

One was statistically

different at 3.3 bu/acre

20

2017 Soybean

Row Spacing Trial

• Lyon County, Strip-till, planted 5/10, 140K, following

corn, 3 reps.

• 30” rows averaged 66 bu/acre

• 15” rows averaged 61.7 bu/acre

• NOTE: Significant white mold in this plot

21

Soybean row spacing trials –

’08 – ‘14• 14 trials 15” v. 30”

– 15” average = 60.64 bu/a

– 30” average = 58.24 bu/a• 5 of 14 showed at least a 3+ bu/a increase with narrow

rows.

• 8 trials 18” v. 36”

– 18” average = 59.99 bu/a

– 36” average = 55.61 bu/a• 5 of 14 showed at least a 3+ bu/a increase with narrow

rows.

22

NWRF Soybean row spacing

research – 2016 - Asgrow

23

NWRF Soybean row spacing

research – 2017 - Asgrow

24

NWRF Soybean row spacing

research – 2016 - Pioneer

25

NWRF Soybean row spacing

research – 2017 - Pioneer

26

Tilled v. No-Tilled Soybeans

• 17 trials, from 2006 through 2016.

– Mostly compared to a single pass tillage

• Overall average:

Tilled = 60.4 bu/a No-tilled = 60.3 bu/a

• 3 of 17 had a 2 bu/a or greater increase with

tillage; 2 favored no-till by 2 bu/a or more.

27

Rolling Soybeans, 2009 – 2014, 21 trials

Rolled – average = 58.3 bu/acre

Not rolled = 57.7 bu/acre

1 < 2 bu/acre

2 > 2 bu/acre

Biggest was + 6.3 bu/A

28

Photo from Corn+Soybean Digest, 6/12/15

Starter fertilizer on corn• Osceola County – 2 cooperators. Four gallons

• 6-24-6-.5Zn in-furrow per acre. Soil test levels optimum or better.

Location Starter, bu/a Untreated, bu/a

1 G 214.4 210.4

2 244.8 240.5

3 252.2 250.5

4 246.3 243.4

5 259.4 256.3

6 247.0 244.7

7 219.7 224.6

8 250.9 252.3Ave: 241.8 240.3

29

Soybean Variety & Herbicide

Trial

• Sioux County. Authority + Warrant. F/B

Liberty (L beans); Flexstar + glyphosate (R

beans); or Extendimax + glyphosate (X

beans).

P22T10L P22T73R P22T24X

69.4 bu/a 75.6 bu/a 74.4 bu/a

30

Aphid tolerant v. non-tolerant soybeans

• Sioux County, not treated for aphids, on organic acres

• Viking 2188 (tolerant) v. Viking 2065

66.7 bu/a 64.3 bu/a

Corn RW Insecticide trial on continuous corn

• Lyon County, planted May 4. Both hybrids contain Herculex Extra traits.

• 5 reps

With Aztec HC W/out

Site 1: 218.1 bu/a 214.5 bu/a

Site 2: 236.8 bu/a* 231.0 bu/a

* = significant at P < .10

Corn Herbicide Yield ComparisonA trial to compare crop yield on corn post treated with either

Impact+atrazine+MAS+AMS to Realm Q + glyphosate

Impact Realm Q

Site #1: 231.6 bu/a 233.1 bu/a

Site #2: 252.8 bu/a 254.4 bu/a

Site #3: 229.7 bu/a 231.7 bu/a

Site #4: 232.7 bu/a 233.7 bu/a

Other trials conducted on NW Iowa farms in 2017

• Encirca with Y-drop N application

• Soybean inoculation

• Side dress N vs. none with manure

• Early v. late planting of soybean

• To find results from additional trials,

check these web sites:

– http://farms.ag.iastate.edu/farms

• OR:

– http://www.extension.iastate.edu/plymouth/

crops

**But – full results won’t be available in a

printed form until February, I think.

There is more!!!

Joel DeJong, ISUEO Field AgronomistPlymouth Co. Extension Office

jldejong@iastate.edu712-546-7835 @joel_dejong

Thank you.

What questionsdo you have for

me?