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Managing vineyard variability by variable rate fertilization. Different fertilizers leads to different results

Matteo Gatti, DI.PRO.VE.S., Università Cattolica del Sacro Cuore, Piacenza, Italy

Managing vineyard variability by variable rate fertilization. Different fertilizers leads to different results

Precision viticulture aims to a better description and management of within-field variability that can be exploited or corrected by variable rate (VR) applications. Despite VR fertilization is a recognized powerful tool aiming at optimizing vine balance, few experiences validating this hypothesis are known.

Since 2012, two experiments were performed in order to assess long-term effects of VR N-supply. In both cases, pre-trial NDVI-based vigor maps of two neighboring Barbera vineyards were performed and a randomized block design was established by considering two main factors: vigor (L = low, M = medium and H = high) and fertilization strategy (Standard, VR Application, and Control).

VR reduced N-supply according to vigor delivering 120, 60 and 0 kg/ha (exp.1) and 80, 40 and 0 kg/ha (exp. 2) to L, M and H, respectively.

In both experiments standard supply corresponded to the intermediate prescription whilst control vines were kept unfertilized. Urea (46%N) and a Controlled Release Fertilizer (CRF) (13.5.21+Mg+S) were used in exp1 and exp2, respectively. Vine growth, yield, leaf nutritional status and fruit composition were assessed over 4 (exp1) and 3 (exp.2) years.

Report presented at the SIVE OENOPPIA Awards 2019. The paper reproduced in this video-seminar was presented at the 12th edition of Enoforum (Vicenza, Italy, May 21-23, 2019).

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Published on 28/05/2020
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