Influence of Planting Date on the Growth and Yield of Different Maturity Group of Soybeans in the Southeastern Coastal Plains of USA.pdfVIP

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Influence of Planting Date on the Growth and Yield of Different Maturity Group of Soybeans in the Southeastern Coastal Plains of USA.pdf

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Influence of Planting Date on the Growth and Yield of Different Maturity Group of Soybeans in the Southeastern Coastal Plains of USA.pdf

JournalofAgriculturalScienceandTechnologyB1(2011)251-265 Earliertitle：JournalofAgriculturalScienceandTechnology ISSN 1939．1250 ， … … InfluenceofPlantingDateontheGrowthandYieldof DifferentMaturityGroupofSoybeansinthe S0UtheaSternCoastaIPlainsofUSA P．W iatrak andG．Chen ，．DepartmentofEntomology,Soils。andPlantSciences，ClemsonUniversity,EdistoResearch＆EducationCenter,Blackville．SC 29817 UsA 2．DepartmentofLand,AirandWaterResources，UniversiytofCalfiornia，Davis，3140PlantandEnvironmentalScienceBuilding OneShieldsAvenue Davsi CA95616．USA Received：April13，2011／Published：June20，2011 Abstract：Plantingdateisacriticalcomponentofsoybean G【lycinemaxL【．)Merr．1production，underdrylandconditionsinthe SoutheasternCoastalPlain．Theobjectivesofthisstudywereto1．EvaluatetheeffectofplantingdateonplantleafareaindexfLAI1 andnormalizeddifferencevegetationindex(NDVI)at60and90daysafterplnating(DAP)，plantheightandgrainyield，and2． Determinetheoptimum plantingperiodby integratingtheresponsesfrom vegetationgrowthtoyieldforsoybeanmaturitygroup (MG)IV—VIIIunderdrylandconditionsintheSoutheasternCoastalPlain．Plantingdateswerescheduledabout14．daysintervals from lateApriltomid—July(2008)orlateJuly (2009)．GreatestgrainyieldofrMG IVwasobtainedrfom plantinginaround mid-Mayinbothyears．TheyieldwasgreaterforMG V plantedinM aynadgreaterforMG VI-VIIIplantedinlateAprilandM ay， butstartedtodeclineforplantinginearlyJune．PlantLAIandNDVIat60DAPwereaffectedbybothplantingdateandprecipitation． butwerepoorlycorrelatedwithgrainyield．However，plantLAIandNDV1werewellcorrelatedwithyieldandwcrcgreaterforMay plantingdatesat90DAP．TheseindiccsdeclinedofrsoybeanplantedafterMrdy．M atureplantheightdecreasedmorerapidlywith delayedplanting．TheseresultsindicatethatplantgrowthandyielddecreasedafterMayplanting．Optimum plantingperiodforall MGswase