Lime Protection for Young Vines Exposed to Copper Toxicity

Rosa, Daniel Jose; Ambrosini, Vítor Gabriel; Kokkoris, Vasilis; Brunetto, Gustavo; Hart, Miranda; Ricachenevsky, Felipe; Pescador, Rosete

Lime Protection for Young Vines Exposed to Copper Toxicity

2020

While foliar application of copper (Cu) containing fungicides can protect vines from fungal infections such as downy mildew (Plasmopara viticola), it can increase soil Cu content which increases disease susceptibility, especially in acidic soils. In this study, we hypothesized that lime (CaCO₃ + MgCO₃) addition may minimize Cu toxicity in vines by increasing pH and reducing Cu bioavailability. We applied two Cu (no Cu added, 50 mg Cu kg⁻¹) and three lime (no lime added, 1.5, 3.0 Mg ha⁻¹) quantities on a Typic Hapludalf soil. After 60 days, root, plant performance, and biochemistry were measured. As expected, high Cu content negatively affected growth, nutrient status, and metabolism of young vines. However, addition of 3.0 Mg ha⁻¹ lime raised the soil pH from 4.5 to 6.1, decreasing Cu toxicity effects in young vines. Thus, lime addition is an effective strategy in protecting young vines in soils with high levels of Cu. Graphical Abstract .

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