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Extension

Failed Cotton Herbicide Rotation Restrictions to Soybean in Oklahoma

Efficient weed management is vital for successful crop production and sustaining agricultural productivity. Herbicides play a crucial role in this regard, assisting farmers in controlling weed populations and preserving crop health. In Oklahoma, challenges arise for producers when transitioning from failed cotton to soybeans due to herbicide rotation restrictions. Residual herbicides remain active in the soil for an extended period after application, providing ongoing weed control by inhibiting weed seed germination or growth. Non-residual herbicides are fast-acting and degrade quickly, affecting not only the weeds present at the time of application without providing long-term control. Non-residual herbicides are typically used for immediate control of actively growing weeds.

This publication implores the importance of adhering to herbicide rotational restrictions during the transition between individual crops- in this case a fail/early terminated cotton crop to soybean. By consolidating information on commonly used herbicides in cotton production and their residual effects on soybean crops, farmers can make informed decisions to protect their crops from potential herbicide damage and optimize yields. Rotational restrictions are crucial for preserving crop rotations like soybeans, mitigating the negative impacts of herbicide residues.

Table 1. List of common pre-plant herbicides used on grain sorghum and their rotation restrictions with soybean.
HerbicideComponent HerbicidesMOASoybean Rotational RestrictionsNotes
2,4-D LV62,4-Dichlorophenoxy-acetic Acid (Amine or Ester)414 DaysThis does include Enlist soybean in accordance to label.
AIM ECCarfentrazone140 Days 
Assure IIQuizalofop10 Months 
CaparolPrometryn512 MonthsFollows the all other crops on the label.
ClarityDicamba414 DaysTime interval is based on 8 oz/A application rate and does not begin until 1 inch of rainfall is received.
Dual MagnumS-Metolachlor150 Months 
Fusilade DXFluazifop10 Months 
FusionFluazifop Fenoxaprop10 Months 
Roundup Power MaxGlyphosate90 Months 
Gramoxone SL
2.0
Paraquat220 Months 
Liberty 280 SLGlufosinate-Ammo-nium100 Months 
Direx 4LDiuron7Next season 
EngeniaDicamba BAPMA Salt40 Months 
Enlist Duo with Colex-D Technology2,4-D Choline Salt Plus Glyphosate DMA Salt4 & 930 DaysEnlist corn, cotton, and soybeans can be planted immediately.
Enlist One with Colex-D Technology2,4-D Choline Salt415-30 DaysRotation intervals increase with higher application rates. Enlist corn, cotton, and soybeans can be planted immediately.
MSMA 6.6MSMA170 Months 
OutlookDimethenamid-P150 Months 
Poast PlusSethoxydim10 Months 
Prowl 3.3 ECPendimethalin30 Months 
Select 2 ECClethodim10 Months 
SequenceMetolachlor & Glypho-sate15 & 190 MonthsWhen applied at 1 oz/A rotation interval for soybean is 0 months.
SharpenSaflufenacil140-6 MonthsRotation intervals increase with higher application rates.
Staple LXPyrithiobac210 Months 
Tavium Plus VaporGripDicamba & S-Meto-lachlor4 & 1528 DaysXtend soybean and cotton can be planted immediately.
Treflan HFPTrifluralin30 Months 
Valor SXFlumioxazin140 Months 
WarrantAcetochlor150 Months 
XtendiMax with Vapor Grip TechnologyDicamba DGA Salt414-28 DaysRotation intervals increase with higher application rates.
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