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Nutrient Management Effects on Wine Grape Tissue Nutrient Content.

John L Havlin1, Robert Austin1, David Hardy2

  • 1Department of Crop & Soil Science, North Carolina State University, Raleigh, NC 27695, USA.

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|January 20, 2022
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Summary
This summary is machine-generated.

Late season foliar nitrogen applications significantly improve grape yeast assimilable nitrogen (YAN) and petiole nitrogen. Annual monitoring of petiole phosphorus and potassium is crucial for informed nutrient management in vineyards.

Keywords:
nutrient managementremote sensingsoil testingwine grapes

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Area of Science:

  • Viticulture
  • Plant Nutrition
  • Agricultural Science

Background:

  • Limited research exists on nutrient management for North Carolina grape (Vitis vinifera) production.
  • Optimizing nitrogen (N), phosphorus (P), and potassium (K) is vital for grape yield and quality.

Purpose of the Study:

  • To evaluate the impact of late-season foliar nitrogen application on grape petiole N and yeast assimilable nitrogen (YAN).
  • To assess the long-term effects of pre-bud soil-applied phosphorus (P) and potassium (K) on petiole P and K levels.

Main Methods:

  • Field studies conducted from 2015-2017 evaluated foliar urea application timing and rates.
  • Additional field studies from 2008-2011 assessed broadcast P and K applications and monitored petiole nutrient status for 3-4 years.

Main Results:

  • Late-season foliar N substantially increased petiole N and grape YAN compared to soil-applied N.
  • Smaller, split foliar N applications were more effective for increasing YAN.
  • Soil and petiole P and K levels increased with application rates but declined over time.

Conclusions:

  • Late-season foliar N application is a valuable strategy for enhancing grape YAN.
  • Assessing plant N status via petiole analysis or remote sensing guides effective foliar N management.
  • Annual petiole P and K monitoring is essential for accurate plant status assessment and informed nutrient decisions.