A brief review of selected NDSU soybean production management trials conducted in 2013.

1. 2013 Soybean
Production Update
Greg Endres, Extension area agronomist
NDSU Carrington Research Extension Center
gregory.endres@ndsu.edu 701-652-2951

2. •South-central ND
season review
•Plant establishment
•Timing of weed control

3. inches
May-Sep monthly rainfall, Southcentral ND, 2013

10. Soybean Establishment Study, CREC, 201113
• 2 tillage systems
– conventional and direct seed (‘no-till’)
• 2 planting dates
– multiple trials
• 4 (planting time) fertilizer treatments
– 6-24-6 applied on low-med P (7-9 ppm) and
high-VH K (141-216 ppm) soil
– untreated check, broadcast, 2-inch band
• POST fungicide (2 of 4 reps)
Funded by ND Soybean Council

11. May 30
July 22
conventional
direct seed

12. Soybean Establishment Study, Carrington, 201113: SEED YIELD WITH TILLAGE SYSTEMS
60
52.5 51.8
50
40
40.8
*
45.9 45.3
45.2
43.4
*
40.8
conventional
30
direct seed
20
10
0
2011
2012
2013
3-yr ave
Averaged across planting dates and fertilizer treatments

13. Soybean Establishment Studies, CREC, 2011-12:
SEED YIELD WITH PLANTING DATES
60
50
40
53.7
43.5
*
*
50.6
40.7
37.6
*
30
30.3
27.9
early
19.5
20
10
0
Carrington
2011
May 5/19
Carrington
2012
Apr 30/May 15
New Rockford Wishek 2012
2012
May 2/17
Apr 24/May 16
normal

14. Soybean Establishment Study,
CREC, 2013: Planting dates
May 29
June 12

15. Soybean Establishment Study, CREC, 2013:
Planting dates – impact on plant
development and agronomic factors
Dates for plant development
Planting dates
Emergence
Flower
Maturity (R8)
May 29
163
196
273
June 12
171
202
280
8
6
7
Plants/A
Pod height
Test weight
Planting dates
June 28
cm
lb/bu
May 29
134,740
2
53.7
June 12
129,430
4
52.1
Difference in days

16. Soybean Establishment Study, CREC, 2013:
SEED YIELD WITH PLANTING DATES
50
43.1
42.9
40
30
29-May
12-Jun
20
10
0
Carrington
Averaged across tillage systems and fertilizer treatments

17. Planting date x maturity group, Prosper, 2013
Planting dates: May 13 and 28
Maturity groups: 0.1 and 0.7
(DSR 0101 and 0747)

18. Planting date x maturity group,
Prosper, 2013
Planting
date
Stand
Yield
plants/A
bu/A
Planting
date
May 13
146,560
45.8
May 13
May 28
165,620
40.4
Yield
0.1
46.0
0.7
May 28
Maturity
group
45.7
0.1
38.2
0.7
42.5
bu/A

19. Planting date x maturity group, Wishek, 2013
Planting dates:
May 24
June 6

20. Planting date (4) x variety (2), CREC, 2013
Burton Johnson

21. Soybean Establishment Study, CREC, 201113:
SEED YIELD WITH PLANTING-TIME FERTILIZER
60
50
43.7
42.3
43.0
45.3
46.0
45.8
40
check
30
broadcast
2" band
20
10
0
2013
2011-13
P = low-med and K = high-VH. 6-24-6 applied as band at planting or broadcast PRE (not
mechanically incorporated). Averaged across planting dates and tillage systems.

22. Soybean establishment study, CREC, 2013:
50
SEED YIELD WITH FUNGICIDE 1
44.5
30
20
unt reat ed check
Priax or
10
1
0
bu/ A
40
41.5
4 fl oz/A at R3-4 stages

23. NDSU Soybean Foliar Fungicide Trials, 2004-13 (29 trials):
50
SEED YIELD 1
43.7
30
20
unt reat ed check
fungicide
0
10
bu/ A
40
41.9
Headline or Priaxor applied primarily at R1-3 stages (V2-R4).
Yield statistically significant (LSD 0.05) in 5 of 29 trials.
1
Source: Markell et al.

24. Soybean yield loss from weeds
Timing of initial weed control
Weed height
Soybean stage
At planting (soil application)
VC-V2
(unifoliate to 1st
2 to 4 inches
trifoliate)
V2-V4
(2nd to 4th
6 to 8 inches
trifoliate)
V4-R2
(4th trifoliate to
> 10 inches
full flower)
Untreated check
NDSU: 4 site-years (2011-12).
Soybean yield
bu/A
48.0
46.9
45.2
37.7
19.3

25. Soybean timing of initial weed control, Carrington, 2013
early POST – June 21

26. July 11 – late POST

27. Soybean yield with timing of initial weed
control, Carrington, 2013.
35
32.8
29.8
30
Bu/A
25
LSD (0.05): NS
27.4
22.9
22.7
20
check
at planting
15
ePOST
10
lPOST
mPOST
5
0
Carrington

28. Soybean timing of initial weed
control, NCREC (Minot), 2013
Sep 12

29. NDSU Research Summary of Soybean Plant Establishment Factors
Factor
^Tillage system
Previous crop
A
B
(Oct 2013)
reduced till
Yield >
(%)
7
conventional till
NDSU trial
site-years
19*
wheat
7
soybean
6
no
6
Seed
inoculation
with soybean
history
Seed fungicide
yes
yes
10
no
19
^Planting date
< early May
13
mid May
4
150-175,000
14-21
5
5
100-130,000
28-30
20
19
broadcast
0
5*
at planting
5
band (away from
seed)
early POST
Planting rate
(pls/A)
Row spacing
(inch)
^P at planting
time
^Timing of
Weed Removal
0
5*
*Data from trials conducted during 1999-2013

30. Questions?