Considering Conventional Soybeans: Moving from the Simple to the Complex
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- Dwain Norton
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1 Considering Conventional Soybeans: Moving from the Simple to the Complex
2 What a Difference a Year Makes: Price of Herbicide Inputs Continues to Rise Glyphosate Product Price/Unit a b Generic $13.00/gal $18.00/gal $32.00/gal Glyphosate $0.10/fl oz $0.14/fl oz $0.25/fl oz $3.25/standard app $4.48/standard app $8.00/standard app Roundup $34.00/gal $40.00/gal $67.00/gal PowerMax c $0.27/fl oz $5.94/standard app $0.31/fl oz $6.82/standard app $0.52/fl oz $11.52/standard app Touchdown Total $32.50/gal $0.25/fl oz $36.00/gal $0.28/fl oz $61.00/gal $0.48/fl oz $6.00/standard app $6.75/standard app $11.52/standard app a Prices obtained from major ag retailers in MO but should be viewed as approximates only. b Projected prices for early c Indicates price of Roundup PowerMax in 2008 and 2009 but Roundup OriginalMax in 2007.
3 .but it s not just glyphosate Price/Unit a Product b Aatrex $11.38/gal $13.55/gal $18.50/gal $2.84/qt $3.39/qt $4.63/qt Classic $12.71/oz $13.42/oz $15.50/oz $6.36/standard app $6.71/standard app $7.75/standard app Firstrate $25.98/oz $7.80/standard app $32.08/oz $9.62/standard app $36.00/gal $10.80/standard app Prowl H2O $28.06/gal $34.20/gal $37.00/gal $7.02/standard app $8.55/standard app $9.25/standard app Valor $4.31/oz $12.94/standard app $4.70/oz $14.10/standard app $5.00/oz $15.00/standard app a Prices obtained from major ag retailers in MO but should be viewed as approximates only. b Projected prices for early 2009.
4 1. Preemergence residual herbicides are a requirement.
5 Broadleaves Grasses Treatments Weed Density at POST Application (#/m2)
6 Yie eld (Bu/Ac cre) LSD=
7 We eed Densit ty at POST Application (#/m2) Broadleaves Grasses 0 Treatments *= Indicates PRE herbicides that required only 1 POST glyphosate application **= Indicates PRE herbicides that required 2 POST glyphosate applications
8 Untreated IntRRo (21 May) Prowl (21 May) Rndup PwrMax (20 June) Rndup PwrMax (20 June) Rndup PwrMax (11 July) Rndup PwrMax (11 July)
9 Untreated Boundary (21 May) Authority Assist (21 May) Rndup PwrMax (25 June) Rndup PwrMax (25 June) Rndup PwrMax (29 July) Rndup PwrMax (29 July)
10 Untreated Prefix (21 May) Canopy (21 May) Rndup PwrMax (1 July) Rndup PwrMax (1 July)
11 Untreated Envive (21 May) Valor XLT (21 May) Rndup PwrMax (8 July) Rndup PwrMax (8 July)
12 Yield (Bu/ /Acre) 60 LSD= *= Indicates PRE herbicides that required only 1 POST glyphosate application **= Indicates PRE herbicides that required 2 POST glyphosate applications
13 Considering the $$ of PRE s Treatments Rate/A Cost/A Authority Assist 5 fl ozs Authority First 3.2 ozs Authority MTZ 10 ozs Boundary 1.5 pts Canopy 3 ozs 8.90 Envive 35ozs Gangster 0.3 oz oz IntRRo 2 qts Prefix 2pts Prowl H2O 2 pts 9.25 Valor 2 ozs 9.31 Valor XLT 3 ozs *Approximate retail cost of PRE soybean trtmts in Missouri.
14 2. Once the preemergence residual herbicide breaks, you MUST make a timely postemergence herbicide application for late season broadleaf AND grass weeds.
15 Grass Broadleaf Herbicide Weeds Weeds Comments Aim No Yes fairly limited spectrum of broadleaves; no grass weeds Assure II Yes No grasses only; often needs to be applied separately Basagran No Yes minimal grass control; potential for crop injury Classic No Yes broadleaves only; possible antagonism with grass herbicides; ALS resistant weeds limits utility Cobra/Phoenix Minimal Yes minimal grass control; potential for crop injury Firstrate No Yes broadleaves only; possible antagonism with grass herbicides; ALS resistant weeds limits utility Flexstar/Reflex Minimal Yes minimal grass control; potential for crop injury Fusilade Yes No grasses only; often needs to be applied separately Harmony GT No Yes broadleaves only; possible antagonism with grass herbicides; ALS resistant weeds limits utility Poast Plus Yes No grasses only; often needs to be applied separately Pursuit Yes Yes ALS resistant weeds limits utility Raptor Yes Yes ALS resistant weeds limits utility Resource No Yes fairly limited spectrum of broadleaves; no grass weeds Select Max Yes No grasses only; often needs to be applied separately Ultra Blazer Minimal Yes minimal grass control; potential for crop injury
16 An Example Treatments Timing Rate/A Cost/A RR Seed , Generic Glyphosate EPOST 1 qt AMS EPOST 2.5 lbs 0.50 Generic Glyphosate LPOST 1 qt 8.00 AMS LPOST 2.5 lbs 0.50 Total: RR Seed , Prefix PRE 2 pts Generic Glyphosate POST 1 qt 8.00 AMS POST 2.5 lbs 0.50 Total: Conv Seed , Prefix PRE 2 pts Flexstar POST 1.25 pts Assure II POST 8flozs COC POST 1% v/v 0.66 Total: $37.79
17 Fieldswithdense dense weed populations should probably be avoided when possible. Preemergence herbicides are a necessity, timing of conventional postemergence herbicides is critical (i.e., they won t kill big weeds). Mk Make sure of your reasons for growing conventional soybeans, not because the popular press says it MAY be a cheaper endeavor. Pencil your own seed costs/herbicide programs out and see for yourself. Don t skimp on the weed management program in conventional soybeans. There are few, if any, rescue options.
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