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soil acidity on the palouse – digging deeper

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Soil Acidity on the Palouse – Digging Deeper January 4 th , 2018 Banyans on the Ridge –Pavilion The workshop will feature local experts presenting the most current research on soil acidity for the Palouse region, and will provide a forum to ask and answer questions. The workshop is approved for 8 CCA credits and includes lunch and refreshments. Soil Acidity Beyond Lime and Aluminum Toxicity: Soil Phosphorus and Soil Health – Dr. Tabitha Brown of the Latah Soil and Water Conservation District and WSU Tabitha Brown, in collaboration with the University of Idaho and Latah County growers, has been conducting on-farm research with liming acidic soils. She will discuss her findings on how liming affects soil aggregate stability and extractable soil phosphorous. She will compare soil P extraction methods, traditionally used for Palouse soils, with the Haney extraction method, promoted by NRCS. The Haney method was thought to be a better estimation on P sufficiency level because the test mimics root zone P chemistry. Tabitha will also introduce the causes of soil acidity in Palouse soils and lime management strategies. Soil Acidity in the Palouse; What, Why, and How – Dr. Paul Carter: Extension Specialist for Columbia County Presentation will include survey data collected in Columbia County and various other locations in the Palouse, why we have an acidity problem, and how we are going to continue farming in the future. Research results will be presented that include the use of lime applications and additional micronutrients based on the soil test results. These will include evidence of soil pH changes and wheat yield responses. Soil and Crop Response to Liming in Northern Idaho On-farm Testing – Doug Finkelnburg: Extension Specialist for Nez Perce County & Assistant Professor at UI Soil and agronomic responses to liming a direct seeded field in an annually cropped dryland system will be discussed. Implications for increased broadleaf and grassy weed herbicide options and crop rotation choices in the treatments with strong pH corrections vs the untreated soils will be explored. Management Strategies Can Alleviate the Acceleration of Soil Acidification – Dr. Haiying Tao: WSU Crops and Soils Associate Professor and Nutrient Management Specialist Nitrogen-induced soil acidification is a growing concern in wheat producing states. The impact of acidification by N fertilization is related to application rate and form of N fertilizer. Although liming and soil amendments can be used to alleviate soil acidity. Applying N at the right rate, right form, right timing, and right location is a key to reducing the rate of acidification.

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Page 1: Soil Acidity on the Palouse – Digging Deeper

SoilAcidityonthePalouse–DiggingDeeperJanuary4th,2018BanyansontheRidge–Pavilion

TheworkshopwillfeaturelocalexpertspresentingthemostcurrentresearchonsoilacidityforthePalouseregion,andwillprovideaforumtoaskandanswerquestions.Theworkshopisapprovedfor8CCAcreditsand

includeslunchandrefreshments.

SoilAcidityBeyondLimeandAluminumToxicity:SoilPhosphorusandSoilHealth–Dr.TabithaBrownoftheLatahSoilandWaterConservationDistrictandWSU

TabithaBrown,incollaborationwiththeUniversityofIdahoandLatahCountygrowers,hasbeenconductingon-farmresearchwithlimingacidicsoils.Shewilldiscussherfindingsonhowlimingaffectssoilaggregatestabilityandextractablesoilphosphorous.ShewillcomparesoilPextractionmethods,traditionallyusedforPalousesoils,withtheHaneyextractionmethod,promotedbyNRCS.TheHaneymethodwasthoughttobeabetterestimationonPsufficiencylevelbecausethetestmimicsrootzonePchemistry.TabithawillalsointroducethecausesofsoilacidityinPalousesoilsandlimemanagementstrategies.

SoilAcidityinthePalouse;What,Why,andHow–Dr.PaulCarter:ExtensionSpecialistforColumbiaCounty

PresentationwillincludesurveydatacollectedinColumbiaCountyandvariousotherlocationsinthePalouse,whywehaveanacidityproblem,andhowwearegoingtocontinuefarminginthefuture.Researchresultswillbepresentedthatincludetheuseoflimeapplicationsandadditionalmicronutrientsbasedonthesoiltestresults.ThesewillincludeevidenceofsoilpHchangesandwheatyieldresponses.

SoilandCropResponsetoLiminginNorthernIdahoOn-farmTesting–DougFinkelnburg:ExtensionSpecialistforNezPerceCounty&AssistantProfessoratUI

Soilandagronomicresponsestolimingadirectseededfieldinanannuallycroppeddrylandsystemwillbediscussed.ImplicationsforincreasedbroadleafandgrassyweedherbicideoptionsandcroprotationchoicesinthetreatmentswithstrongpHcorrectionsvstheuntreatedsoilswillbeexplored.

ManagementStrategiesCanAlleviatetheAccelerationofSoilAcidification–Dr.HaiyingTao:WSUCropsandSoilsAssociateProfessorandNutrientManagementSpecialist

Nitrogen-inducedsoilacidificationisagrowingconcerninwheatproducingstates.TheimpactofacidificationbyNfertilizationisrelatedtoapplicationrateandformofNfertilizer.Althoughlimingandsoilamendmentscanbeusedtoalleviatesoilacidity.ApplyingNattherightrate,rightform,righttiming,andrightlocationisakeytoreducingtherateofacidification.

Page 2: Soil Acidity on the Palouse – Digging Deeper

UsingSoilBufferTeststoPredictLimeRequirement–CarolMcFarland:WSUDepartmentofCropsandSoil

DifferentsoilscanrequireverydifferentquantitiesoflimetoraisesoilpH.BufferTestsareaquickmethodthatsoiltestlabscanusetodeterminearecommendationforhowmuchlimetoapply.Thispresentationwillprovideanoverviewofhowbuffertestswork,andhowthedifferenttypesofthesetestsperformonPalousesoils.Theaudiencewillcomeawaywithanincreasedunderstandingofhowtousethisinformationontheirsoiltestreportstobetterunderstandlimerequirementsontheirsoils.

andLimeCalculator:Inthishands-onmini-workshop,wewillprovideanoverviewofhowtousetheonlinelimecalculatorprovidedbyWSUExtensionasadecisionsupporttool(attendeesareencouragedtobringtablets,laptops,orsmartphonestofullyparticipateinthisworkshop).LimeMaterialsandApplication:Dr.DaveHugginsUSDA-ARS

Inaninteractiveformat,Dr.HugginswilldiscussoptionsforchoosinglimematerialswithPalousesoils.Materialselection,notonlyaccountsforprice,butforconsiderationssuchasparticlesizeandpercentcalciumcarbonatetomakesuretheinvestmentgoesthefarthest.Discussionwillalsoincludemethodsofapplicationinno-tillsystems.

PanelDiscussionontheeffectsandmanagementofsoilacidity:

TheEconomicsofLowpHSoils–Dr.KatePainter:ExtensionEducatorfortheUniversityofIdahoinBonner’sFerry

Dr.PainterwillusedatafromtheresearchofDr.PaulCarterandDr.KurtSchroedertounpacktheeconomiclandscapeofsoilacidityonthePalouse.Thetalkwilldiscussthetrade-offsbetweenlimingornot,aswellasmaterialchoice,applicationrate,andhowtoframetheinvestmentforlimingintermsoffarmcapital.

Dr.KurtSchroeder,AssistantProfessorofCroppingSystemsfromUniversityofIdaho.Hisworkand

expertisecoverstheagronomyofsoilacidity,including:liming,crop

performanceinlowpHsoils,andhowlowsoilpHaffectssoilborndisease.

Dr.TaraSullivan,AssistantProfessorofSoilMicrobiologyatWSU.Herresearchfocuseson

microbialcommunitiesinlowpH,highAluminumsoilsinthePalouse.

Dr.DrewLyon,ProfessorandEndowedChairofSmallGrainsExtensionandResearch,WeedScienceatWSU.Hehasin-depthknowledgeoftheeffectsofsoilpHonherbicideresistanceandefficacy.


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