Seeding Rates

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Soybean Production Systems on Coastal Plain
Soils Dr. Jason Norsworthy Clemson Univ. Soybean
Specialist
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Soybean Information Database
http//www.clemson.edu/edisto/soybean/soybean.htm
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Todays Topics
Row widths
Tillage
Pest Management
- Weed management

- Nematode management
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Row Widths
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Recommended Planting Dates May 1 through June
10 for optimal yields
Problem Most of our soybeans are double-cropped
and are therefore planted after June 10
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For late planted, drilled soybeans, a yield
increase of 10 to 15 over wide-row soybeans can
be expected.
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Wide- vs. Narrow-Row Soybeans
David Gunter, Edwin Dargans Farm double-cropped
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For early planted full-season soybeans, yields in
wide and narrow rows will be similar.
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Tillage
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If wheat is deep tilled, is deep tillage
needed in soybeans?
Fall Deep Tillage (51 bu/A) Fall Spring (49
bu/A)
David Gunter, Edwin Dargans Farm No surface
tillage and minimum traffic
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2 x disk Subsoil-bed plant 6.75x210.007.2
5 31 Strip-till 12.00/acre 19
savings/acre Recommended row spacing 30 inches
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Side walls are compacted
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Pest Management
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What pest most limits your yield?
Weeds, 57 Nematodes, 24 Insects, 19
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Weed Management
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Sicklepod
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Sicklepod Control
Preemergence
Python Treflan (PPI) Python Dual
Postemergence (Timing is critical)
Synchrony Classic fb Classic Roundup fb
Roundup
Consider planting STS or Roundup Ready soybeans
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Palmer amaranth
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Palmer Amaranth Control
Preemergence
Python Prowl, Treflan, Dual, or
Lasso Lexone/Sencor Prowl, Treflan, Dual, or
Lasso Scepter Prowl, Treflan, Dual, or Lasso
Postemergence (Timing is critical) Pre fb Reflex,
Cobra, Blazer Pre fb Classic or Harmony GT
Synchrony Roundup fb Roundup
Consider planting STS or Roundup Ready soybeans
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Morningglory species
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Morningglory Control
Preemergence
Canopy (weak on entireleaf) Dual or
Lasso Python Dual Scepter (weak on
entireleaf) Canopy XL
Postemergence (Timing is critical) Flexstar,
Reflex, or Blazer Synchrony, Classic, FirstRate
Roundup fb Roundup
Consider planting STS or Roundup Ready soybeans
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Glyphosate Tank-Mix Partners
FirstRate Morningglories
Classic Morningglories Reflex
Morningglories Residual Palmer
control May reduce glyphosate activity
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Why use a soil-applied or residual herbicide in
Roundup Ready soybeans?
Lengthen the period between emergence and the
need for glyphosate
Prevent early-season yield loss
Delay or prevent resistance to glyphosate
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Glyphosate Products

• Credit, Debit, Glyfos, Glyfos X-TRA, Glyphomax,
  Glyphomax Plus, Roundup Original, Roundup
  Ultra, Roundup UltraMax, Touchdown

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When applying Roundup Ultra alone, use of
additional adjuvant may reduce weed control.
This may vary well be true with other Roundup
(glyphosate) formulations that contain
a premixed adjuvant.
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Effect of Additional Surfactant on Roundup Ultra
Pitted Morningglory
Biomass Reduction
Additional Surfactant
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Effect of Diurnal Leaf Movements on Glyphosate
Efficacy
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Effect of Diurnal Leaf Movements on Glyphosate
Efficacy
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Hard-Water Antagonism of Glyphosate
DI Water
Well Water
1.5 lb/A glyphosate
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Effect of Spray Volume on Glyphosate Efficacy
5 GPA
20 GPA
1.0 lb/A glyphosate
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Gly
Gly
Gly
Gly
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Weeds Having Confirmed Resistance to Glyphosate
Italian Ryegrass, Australia
Italian x Rigid Ryegrass, California
Goosegrass, Malaysia
Horseweed, Delaware
Tall waterhemp?, Iowa
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Nematode Management
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Southeastern Nematodes
Soybean Cyst - Race 3 14
Root-knot - Southern Peanut
Columbia Lance
Reniform
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Southern Root-knot Nematode
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Rotation with corn will not help with either
root-knot species or Columbia lance, but will
help with renifom and soybean cyst.
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Nematode Host Crops
Cotton Peanut Corn
Soybean C. lance Yes No Yes
Yes S. root-knot Yes No Yes
Yes P. root-knot No Yes Yes
Yes Reniform Yes No No
Yes Cyst No No No
Yes
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You must know what species you have in each
field. SOIL SAMPLING
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Damage Thresholds per 100 cm³ soil Root-knot
75 Columbia lance
50 Cyst 25 Reniform
200
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Soybean Cyst - 97
Dr. John Mueller
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Questions?