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Research Article

Effects of Variable Rate Nitrogen Application on cv. Barbera Performance: I. Vegetative Growth and Leaf Nutritional Status

Matteo Gatti, Cecilia Squeri, Alessandra Garavani, Alberto Vercesi, Paolo Dosso, Irene Diti, Stefano Poni
Am J Enol Vitic. February 2018 : ajev.2018.17084; published ahead of print February 28, 2018 ; DOI: 10.5344/ajev.2018.17084
Matteo Gatti
1Department of Sustainable Crop Production (DI.PRO.VE.S.), Università Cattolica del Sacro Cuore, Via Emilia Parmense 84 – 29122 Piacenza (Italy)
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Cecilia Squeri
1Department of Sustainable Crop Production (DI.PRO.VE.S.), Università Cattolica del Sacro Cuore, Via Emilia Parmense 84 – 29122 Piacenza (Italy)
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Alessandra Garavani
1Department of Sustainable Crop Production (DI.PRO.VE.S.), Università Cattolica del Sacro Cuore, Via Emilia Parmense 84 – 29122 Piacenza (Italy)
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Alberto Vercesi
1Department of Sustainable Crop Production (DI.PRO.VE.S.), Università Cattolica del Sacro Cuore, Via Emilia Parmense 84 – 29122 Piacenza (Italy)
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Paolo Dosso
1Department of Sustainable Crop Production (DI.PRO.VE.S.), Università Cattolica del Sacro Cuore, Via Emilia Parmense 84 – 29122 Piacenza (Italy)
2Studio di Ingegneria Terradat, via A. Costa 17, 20037 Paderno Dugnano, Milano (Italy)
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Irene Diti
1Department of Sustainable Crop Production (DI.PRO.VE.S.), Università Cattolica del Sacro Cuore, Via Emilia Parmense 84 – 29122 Piacenza (Italy)
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Stefano Poni
1Department of Sustainable Crop Production (DI.PRO.VE.S.), Università Cattolica del Sacro Cuore, Via Emilia Parmense 84 – 29122 Piacenza (Italy)
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  • For correspondence: stefano.poni@unicatt.it
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Abstract

Variable rate application of vineyard inputs in field parcels characterized by different levels of vigor and/or yield is one of the most promising applications of precision agriculture. In a four year study, we provided ground truthing of three different vigor levels (L = low, M = medium and H = high) derived pre-trial from Normalized Difference Vegetation Index (NDVI) values determined by remotely sensed imagery (5 m pixel resolution) in a small Barbera vineyard (0.64 hectares). Then each vigor level was subjected to three fertilization strategies (S) consisting in no N supply (C, 0 kg/ha), standard supply (S, 60 kg/ha) and variable rate application (VRA) delivering 0, 60 and 120 kg/ha to H, M and L, respectively. Post-trial effects were assessed by taking another NDVI satellite image at the same resolution and by adding a proximal sensing performed with the MECS-VINE® sensor yielding the estimation of a Canopy Index (CI). Ground truthing was based on recording main vine growth parameters and leaf nutritional status. Results show that vine balance of L vines was optimal. Variability between vigor levels was significantly reduced over year 3 and 4, whereas mean effects related to fertilization strategy were non-significant and very few S × V and S × Y interactions were found. However, when the ground truthing assessment was compared with the CI index values it was very clear that VRA was able to reduce variability between vigor levels (CV = 1.42%) vs. standard fertilization at 60 kg/ha (8.20%). A forthcoming companion paper will report about effects on yield, grape health and composition.

  • leaf area
  • leaf nutrition
  • precision viticulture
  • remote sensing
  • urea
  • vine vigor
  • Received September 2017.
  • Revision received January 2018.
  • Accepted February 2018.
  • Copyright © 2018 by the American Society for Enology and Viticulture. All rights reserved.

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Effects of Variable Rate Nitrogen Application on cv. Barbera Performance: I. Vegetative Growth and Leaf Nutritional Status
Matteo Gatti, Cecilia Squeri, Alessandra Garavani, Alberto Vercesi, Paolo Dosso, Irene Diti, Stefano Poni
Am J Enol Vitic.  February 2018  ajev.2018.17084;  published ahead of print February 28, 2018 ; DOI: 10.5344/ajev.2018.17084

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Effects of Variable Rate Nitrogen Application on cv. Barbera Performance: I. Vegetative Growth and Leaf Nutritional Status
Matteo Gatti, Cecilia Squeri, Alessandra Garavani, Alberto Vercesi, Paolo Dosso, Irene Diti, Stefano Poni
Am J Enol Vitic.  February 2018  ajev.2018.17084;  published ahead of print February 28, 2018 ; DOI: 10.5344/ajev.2018.17084
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