Sandler, Hilary A.

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University of Massachusetts AmherstScholarWorks@UMass AmherstCranberry Station Extension meetings Cranberry Station Outreach and Public ServiceActivities2006Research Update Meeting 2006 - OSC NitrogenRate and Pruning Intensity 2006Hilary A. SandlerUniversity of Massachusetts - Amherst, hsandler@umass.eduFollow this and additional works at: https://scholarworks.umass.edu/cranberry_extensionPart of the Horticulture CommonsThis Article is brought to you for free and open access by the Cranberry Station Outreach and Public Service Activities at ScholarWorks@UMassAmherst. It has been accepted for inclusion in Cranberry Station Extension meetings by an authorized administrator of ScholarWorks@UMassAmherst. For more information, please contact scholarworks@library.umass.edu.Recommended CitationSandler, Hilary A., "Research Update Meeting 2006 - OSC Nitrogen Rate and Pruning Intensity 2006" (2006). Cranberry StationExtension meetings. 76.Retrieved from https://scholarworks.umass.edu/cranberry_extension/76Nitrogen  Rate  and  Pruning  IntensityResearch  sponsored  and  supported  by  Ocean  Spray  Cranberries,  Inc.Grower  Cooperators:Decas  Cranberry  CompanyGilmore Cranberry CompanyObjectives? Evaluate  interaction  of  N  rate  and  pruning  intensity  on  vine  biomass  and  cranberry  productivity? Develop   recommendations  for  weed  control  in  plantings  of  new  varietiesTreatments? 4  N  levels? 0,  50,  100,  and  150  lb/A? 4  Pruning  intensities?None,  low,  medium,  and  high? 2  sites  ‘Stevens’Treatments? Spring  pruning  ? Nitrogen:  4  equal  doses? Each  combination  replicated  3x? Plots  are  270 ft2 or  300 ft2? Study  initiated  in  2003Low  Pruning0 N100 N150 N50 N0 N100 N150 N50 N100 N150 N50 N0 N50 N0 N150 N100 N0 N100 N50 N150 NLOW HIGH MED NONEONE  REPLICATEPruning  Intensity100 lb/N Hi PruneCARVER  SITE  2004CARVER  SITE  2004100 LB/NHI PRUNE100 LB/NLOW PRUNE150 LB/NNO PRUNEROCHESTER  SITE  2005100 LB/NMED PRUNE150 LB/NNO PRUNE0 lb/NNo Pruning4 inches2004150 lb/NNo Pruning7 inches2004Data  Collected? Spring  pruning  weights? Vine  samples? Upright  density  evaluation? Harvest  samplesSpring  Weights - Y2  across NP<0.00100.511.52none low medium highPruning intensityBiomass (t/ha)abbccSpring  Wt - Y2  across PruningP=0.0470.0000.2000.4000.6000.8000 56 112 168Nitrogen (kg/ha)Biomass (t/ha)Flowering  Upright  Density – 2 yr0100020003000none low medium highPruning intensityNo. flowering uprights/m2Zero N Low NMedium N High Na ab babaabba a abP=0.007Flowering  Upright  Density – Y2050010001500200025000 56 112 168Nitrogen (kg/ha)No. flowering uprights/m2Year 2P=<0.00100.10.20.30.40 56 112 168Nitrogen (kg/m2)Runner biomass (kg/m2Year 1Year 2Runner  Biomass / m2P<0.001Y2Y1Marketable  Yield  - Year 1P=0.006All pruning trmts combined0510150 56 112 168Nitrogen (kg/ha)Marketable yield (Mg/ha)Marketable  Yield  - Year 205101520253035none low medium highPruning intensityMarketable yield (Mg/ha)Zero NLow NMedium NHigh NP=0.018a aaa aaa abbbbbabc cEconomic  Analysis? Cost  of  N  fertilizer? Fruit  yield  ($32 / bbl)? Prunings  harvested?Cost  to  buy  ST  vines  ($1500 / ton)? Net  Income =  Yield  + Vine  Savings - Fertilizer  Costs? Y1, Y2  &  both years combinedPreliminary  Economics (2 yr data only)? Low - N  rate / pruning  combinationshad  highest  economic  returns  overall? High - N  rates consistently  had  lowest  income,  irrespective  of  pruning  intensityOther  Highlights(2 yr data  only)? Each  50 - N  increment  > 50 lb/A gave  ~ 14%  increase vine  biomass  (spring  harvest)? #,  biomass, and  % Uf decreasedwith  increasing  N  rate?Unaffected  by  pruning  intensityOther  Highlights  (2 yr data)?Marketable  yield  declined with  increasing  N  rate,  esp.  > 50 lb?Unaffected  by  pruning  intensity? Runner  # ,  biomass  increased with  increasing  N  rate?Unaffected  by  pruning  intensityNotes?Mean  vine  biomass  (spring)? Low = 0.12  ton / A?Medium  = 0.26 ton / A?High =  0.51  ton / A? 2005  data  being  processed? Continue  project  in  2006Questions ??

Research Update Meeting 2006 - OSC Nitrogen Rate and Pruning Intensity 2006

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Research Update Meeting 2006 - OSC Nitrogen Rate and Pruning Intensity 2006

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