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Comparison of Conventional, Roundup Ready, and Liberty-Link Cotton Weed Management Programs in Two Tillage Systems . Michael Patterson, Bob Goodman and Dale Monks Auburn University Wilson Faircloth USDA-ARS, Dawson Ga. Alabama Cotton.

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Comparison of Conventional, Roundup Ready, and Liberty-Link Cotton Weed Management Programs in Two Tillage Systems

Michael Patterson, Bob Goodman and Dale Monks

Auburn University

Wilson Faircloth USDA-ARS,

Dawson Ga.


Alabama Cotton Cotton Weed Management Programs in Two Tillage Systems

  • In Alabama and most of the southeast, Roundup Ready Cotton comprises 90% to 95% of the acreage.

  • The remainder of cotton acreage is planted in conventional (non-transgenic) or Liberty-Link varieties.

  • Over 75% of Alabama cotton is grown in some form of reduced tillage.


Research Objectives Cotton Weed Management Programs in Two Tillage Systems

  • Evaluate cotton production in tilled and reduced till systems using Roundup Ready, Liberty Link, and conventional weed management programs.

  • Evaluate the economic viability of each tillage/weed management system.

  • Philosophize on the implications of the data.


Materials and Methods Cotton Weed Management Programs in Two Tillage Systems Locations

Tennessee Valley Research and Extension Center

Belle Mina

(Decatur clay loam)

Wiregrass Research and Extension

Center

Headland

(Dothan sandy loam)


Materials and Methods Cotton Weed Management Programs in Two Tillage Systems Experimental Particulars

Time frame: 2005, 2006

Varieties: FM 966, FM 960 RR, FM 966 LL

Conventional and reduced tillage.

Six Treatments

Replicated four times

Plot Dimensions: both north and south AL = four rows by 40’ long, each plot separated by four border rows


Materials and Methods Cotton Weed Management Programs in Two Tillage Systems Experimental Particulars

Tractor mounted sprayer used: 15 GPA.

Conventional tillage: north AL = disk 2X, roterra. south AL = subsoil, disk, roterra.

Reduced tillage: north AL = notill into wheat, south AL = strip till into wheat.

Soil types: north AL = clay loam. south AL = sandy loam


Tillage herbicide treatments
Tillage/Herbicide Treatments Cotton Weed Management Programs in Two Tillage Systems


Costs of tillage weed systems per acre
Costs of Tillage/Weed Systems($ per acre) Cotton Weed Management Programs in Two Tillage Systems






Summary north alabama
SUMMARY (north Alabama) (south Alabama)

No yield differences due to herbicide/tillage system in.

Decrease in late season broadleaf weed control for Conventional till in 2006.

Slight and inconsequential differences in strength and turnout between varieties.


Summary south alabama
Summary (south Alabama) (south Alabama)

Greater yield in strip till than in conventional till in both years.

Greater yield in RR and LL systems than in conventional herbicide systems in both years.

Strip till returned $75.00 per acre more than conventional on average.

RR and LL returned $108.00 and $71.00 more per acre respectively than conventional herbicide system.


Implications of data
Implications of data (south Alabama)

Probable reduction in economic return if south AL cotton growers return to conventional tillage and conventional herbicide technology.

New post-emergent herbicide technology with activity on pigweed is needed in light of the recent discovery of glyphosate and ALS resistant pigweed biotypes.


Support
Support (south Alabama)

  • Researchers gratefully acknowledge the financial assistance of Cotton Incorporated and Alabama cotton growers in conduction of this research.

  • Reseachers also gratefully acknowledge the support of Alabama Agricultural Experiment Station personnel at the Tennessee Valley and Wiregrass Research and Extension Centers.


Questions? (south Alabama)

Q


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