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EffectofPGRStrategiesontheYieldsofNew

CottonVarieties Akeyfactorinproducinghighyieldingcottonismanagingtheperennialandindeterminategrowthhabitofthecottonplantwithplantgrowthregulators(PGRs).ProperuseofPGRscanbecriticalformaximizingyieldsinanygivenyearandmismanagementofPGRs

canresultinreducedyields.When determining the proper

application timing of PGRs, several factors such as soil type, soilfertility, irrigation and field history should be taken into account.EnvironmentalfactorscanalsoinfluencePGRstrategiesandtheireffectiveness.However,understandingaparticularvariety’sgrowthhabitandit’sresponsetoaPGRapplicationisoneofthemostimportantfactorsindevelopingsoundplantgrowthmanagement

strategiesPlant response to PGRs can vary depending on the cotton

variety, plant genetics and the environment during and after application.Thismakesablanketrecommendationverydifficultandoftenimpractical.

Study guidelines

InordertobetterunderstandthegrowthhabitsandresponseofthenewDeltapine®Classof‘09cottonvarieties,studieswerecarriedoutatTheLearningCenteratScott,MStoinvestigatetheeffectsoflightandheavyPGR

managementstrategies.FivenewDeltapineClassof‘09varieties (DP 0912B2RF, DP 0924B2RF, DP 0924B2RF, DP0935B2RF and DP 0949B2RF) andacheck(DP555BG/RR)wereplantedintoirrigatedandnon-irrigatedstudiesonasiltyloamsoilonMay12

th.Experimentaldesignationsandthecorrespondingcommercialdesignationsaregivenin

Table1.Thefieldwasfertilizedwith120lbsofnitrogenperacre,30lbsofphosphorusperacre,and120lbsofpotassiumperacre.Theirrigatedportionofthestudyreceived5irrigationsandthetriallocationreceived15inofrainduringthegrowingseason.Cottonvarietiesweresetupin8rowplotswith4rowsreceivingthelightmanagementstrategyand4rowsreceivingtheheavymanagementstrategy.ForthelightPGRstrategy,16fl/ozofPix®peracre

andwasappliedatearlybloom.IntheheavyPixstrategy,8fl/ozperacrewasappliedatmatchheadsquare,16fl/ozatearlybloom,and16fl/ozatmidbloom.Plotswereharvestedwithacommercialcottonpickeradaptedtoharvestindividualplots.SeedcottonwasginnedandweighedinScott,MStodeterminelintyieldperacre. 

Study Results

Responsesofthevariousvarietieswereconsistentacrossboththenon-irrigatedandirrigatedplots(Figures1&2)asrelativeyielddifferencesweresimilarwithrespecttoPGRstrategyregardlessofwaterinputs.LowPGRstrategiesresultedinnumericallyhigheryieldsforfourofthefivenewClassof‘09varietiesacrossbothwaterregimes.DP0935B2RFbrandwastheexceptiontothistrendasithad

numericallyhigheryieldswiththehighPGRregimewithlintyieldsof10and23lbs/Amore.ThelargestdifferencesseenbetweenthetwoPGRregimeswereamongDP0920B2RFat167and148lbs/AandDP0949B2RFbrandsat273and151lbs/A.DP555BRperformedasexpectedasithadhigheryieldswithmorePGRsappliedresultingina27and177lb/Ayieldadvantage.

Conclusions

 Asexpected,thecottonvarietiesrespondeddifferentlytoPGRapplications.Thesimilartrendsbetweenthenon-irrigatedandirrigatedplotssuggestalevelofcontinuityintheresearchresults.InsevenoutoftwelvecomparisonsbetweenthehighandlowPGRstrategies,yielddifferenceswerelessthan70lbs/A.ThelargestyielddifferencesamongthenewvarietieswereseenbetweenDP0949B2RFandDP0920B2RF,suggestingthatlowertotalamountsofPGRsmaybeagoodtooltomaximizeyieldpotentialofthesevarieties.Careshouldbetakentomonitorallvarietieswithrespecttotheirgrowthpatterns;lookingat4thand5thinternodedistances,soilmoisture,agronomic

The Learning Center at Scott, Mississippi 

2008 Research Summary2008 Research Summary 

2 8 2 9

Experimental Designation Commercial Brand

07W505B2R2 DP0912B2RF

07W901B2R2 DP0920B2RF

DP0924B2RF

DP0935B2RF

07W514B2R2 DP0949B2RF

Table1.2008experimentaldesignationsaslistedatthe

LearningCenteratScott,MSand2009commercialbrandnamesgiventothecottonvarietiesinthisexperiment.

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EffectofPGRStrategiesontheYieldsofNewCottonVarieties

practicesandweatherpatternstomakePGRapplicationdecisionsontheseandallcottonvarieties.Thisstudygivesasnapshotofonlyonegrowthenvironment,oflocationandyear,butmayprovideinsightintogeneralrecommendationsofwhattolookforintheDeltapineClassof‘09varieties.

 

Note:Theseresultsarenotintendedto

provideyouwithablueprintonhowtogrow

anyspecificvarietybutmerelytogivethe

benefitofsomeresearchwiththem.Your

experienceandknowledgewillremainan

invaluablecomponenttothesuccessfulmanagementofanyvariety.This

informationisbeingprovidedtoyoutoaid

 youinmakingdecisionsandgivingadvice

regardingthemanagementofthese

varieties.Theinformationisnotintended

tototallysupplantyourexperienceand

knowledgebaseonthepropermanagement

ofyourindividualcrops.

2008 Research Summary2008 Research Summary 

The Learning Center at Scott, Mississippi 

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Figure1.Non-irrigatedlintyieldsofcottonvarietiesacrosstwodifferentPGRregimes.*Positiveyielddiffenceinlintlbs/AofthebestPIXregime.

26lbs*

167lbs

11lbs 10lbs

273lbs 27lbs

Monsanto Company is a member of BIO’s ExcellenceThrough Stewardship(SM) (ETS) Initiative. This product

has been commercialized in compliance with the ETS andMonsanto Product Launch Stewardship policies, after

meeting applicable regulatory requirements in key exportmarkets with functioning regulatory systems. Any crop or

material produced from this product can only be exportedto, or used, processed or sold in countries where all neces-

sary regulatory approvals have been granted. It is a violationof national and international law to move material contain-

ing biotech traits across boundaries into nations whereimport is not permitted. Monsanto encourages growers totalk to their grain handler to confirm their buying positionfor this product. Excellence Through Stewardship(SM) is a

service mark of Biotechnology Industry Organization.Cottonseed containing Monsanto traits may not be

exported for the purpose of planting without a license

from Monsanto. 

Scott MS 2009; Individual results may vary, and perform-

ance may vary from location to location and from year toyear. This result may not be an indicator of results you mayobtain as local growing, soil and weather conditions may

vary. Growers should evaluate data from multiple locationsand years whenever possible.

Growers may utilize the natural refuge option for varie-

ties containing the Bollgard II® trait in the followingstates: AL, AR, FL, GA, KS, KY, LA, MD, MS, MO, NC,

OK, SC, TN, VA, and most of Texas (excluding the Texascounties of Brewster, Crane, Crockett, Culberson, El Paso, Hudspeth, Jeff Davis, Loving, Pecos, Presidio, Reeves, Terrell, Val Verde, Ward andWinkler). The natural refuge option does not apply to Bollgard II cotton grown in areas where pink bollworm is a pest, including CA, AZ, NM,and the above listed Texas counties. It also remains the case that Bollgard® and Bollgard II cotton cannot be planted south of Highway 60 in

Florida, and that Bollgard cotton cannot be planted in certain other counties in the Texas panhandle. Refer to the Technology Use Guide and IRMGuide for additional information regarding Bollgard II, Bollgard, natural refuge and EPA-mandated geographical restrictions on the planting of Bt

cotton. ALWAYS READ AND FOLLOW PESTICIDE LABEL DIRECTIONS.  Roundup Ready® crops contain genes that confer toleranceto glyphosate, the active ingredient in Roundup® agricultural herbicides. Roundup® agricultural herbicides will kill crops that are not tolerant toglyphosate. Bollgard II and Design®, Growing Knowledge and Design®, Respect the Refuge andCotton Design®, Roundup®, Roundup Ready®, and Monsanto imagine® and Vine Design® are

registered trademarks of Monsanto Technology LLC. Deltapine® is a registered trademark of D&PLTechnology Holding Company, LLC. All Other Trademarks are property of the respective owners.

©2009 Monsanto Company.

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Figure2.IrrigatedlintyieldsofcottonvarietiesacrosstwodifferentPGRregimes.*Positiveyielddifferenceinlintlbs/AofthebestPIXregime

69lbs*

148lbs54lbs

23lbs

151lbs177lbs

      Y      i    e      l      d      (      l      i    n

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