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JournalLatestresultsfromeld-scalestudiesandsmallplottrialsacrosstheAgriiresearchnetworkintheBestofBritishWheat15TonneChallengehighlightthefundamentalimportanceofthebest-balancednutritionthroughoutthegrowingseasoninconsistentlyraisingtheyieldbar.Toachievea15thacropourkeyprioritiesmustbetobuildandmaintainsufcienttillersensurethebestpossiblegrainsetandpreservethemostefcientcropcanopytosupportgrainllexplainedAgriiHeadofCropScienceDavidLangton.WecantdothiswithoutsufcientNPandKbeingavailabletoourcrops.Norcanweachieveitifotheressentialnutrientsarelimiting.Andthebalancebetweenthemneedstoremainasoptimalaspossiblethrougheachstageofcropdevelopment.PandKindexesof2and250kghaofNmaybesufcientforyieldsof8-10tha.Equallyattheselevelstheremaynotbemuchneedforextrasulphurmagnesiumormicro-nutrients.Butfor15thaitsanotherstory.Soasweraisetheperformancebarweneedtoraiseourwholenutritionalgame.ClearevidenceoftheextenttowhichthisisrequiredandindicationsofwaysitcanbeachievedareemergingfromAgriiTechnologyCentrestudiesinvestigatingawholerangeofnutrientinteractions.Particularlyimpressivehavebeentheyieldresponsesfoundfromfoliartraceelementsonsomesites.Interestinglythemostrecentresultsshowednoresponsetoindividualapplicationsofzinccopperorboronbutanextra0.5thafromamixtureofthethree.Andthishasclearlybeenlinkedtobettergreenleafretentionduringgrainll.ThisunderlinestheimportanceofeliminatingallthenutritionallimitationsifwearetomakethemostofeverynutrientweapplyDavidLangtonstressed.Thishastobethesinglemostimportantkeytopushingyieldstowardsthe15tmark.Agriiresearchintothetypeandtimingofnitrogenapplicationsandcompostadditiontoimprovethephysicalandchemicalpropertiesofsoilsarealsomakingvaluablecontributionstothewheatperformanceimprovementroadmap.Dependingoncropgrowthandsoilnitrogensupplyupwardsof325kghaoffertiliserNislikelytoberequiredtosupport15thapointedoutDavidLangton.TominimisethepotentialforNlossthroughleachingde-nitricationandlock-upbysoilmicrobesthisislikelytobebestachievedwithfoursplits.Butweneedtotakeparticularcarewithmid-seasonapplications.ToomuchNatthisstagecaneasilyproducelushoppycanopieswhichareinefcientatcapturinglightandmorepronetolodginganddiseaseespeciallysoifnotbalancedwithothernutrients.OfcourseraisingtheefciencyoffertiliserNfromthe60generallyachievedonmediumsoilstosay80byimprovingsoilhealthandconditionwillhaveamajoreffectontheamountofNweneedtoapply.WhichiswhereourworkoncompostapplicationshowingvaluableincreasesinorganicmatterPKindexesandsoilconditionisprovingveryinstructive.01AgriiEastAutumnWinter2014ContentsNutritionalKeystoWheatPerformancePage01AgriiiFarmeventpreviewsPage02CAPEveryoneOnlinePage03BarleySeedChoicesfortheSpringPage03AgriiatCropTec2014Page04IntroducingtheMetQuestDashboardPage04ProgressupdatefromFruitiFarmatEMRPage05YourlocalAgriipointsofcontactPage06NutritionalKeystoWheatPerformancewww.agrii.co.ukagriiUK