Adapting Viticulture Practices to Combat Heat Stress
Thursday 1 August 2024
Innovative Strategies for Managing Heat Stress in Viticulture: Insights from 2020 Nuffield Scholar Sarah Keough
"We’ve found that integrating advanced monitoring tools and regenerative farming practices is essential to improve vineyard resilience to heat stress. Adapting these methods can significantly mitigate the impact of extreme weather events on grape quality and yield," 2020 Nuffield Scholar, Sarah Keough.
Sarah Keough, a 2020 Nuffield Scholar and an advocate for sustainable viticulture, has conducted extensive research on innovative strategies to manage heat stress in vineyards.
Her findings emphasise the importance of integrating advanced monitoring tools and regenerative farming practices to enhance vineyard resilience. Sponsored by Wine Australia, Sarah's research journey saw her travel internationally, including visits to Israel, New Zealand, and the United States, where she explored cutting-edge viticultural practices.
During her travels, Sarah discovered that the use of advanced irrigation tools and plant monitoring technologies can play a crucial role in mitigating the effects of heat stress on grapevines.
"By adopting precision irrigation and soil moisture monitoring, we can ensure that vines have optimal moisture levels during heatwaves, which is critical for maintaining vine health and fruit quality," Sarah explains.
Sarah Keough in Zimbabwe, 2023
One of the key tools Sarah highlights in her report is the use of dendrometers, which measure the slight expansions and contractions of vine trunks to detect water stress. "Dendrometers provide real-time data on vine water status, allowing growers to make informed irrigation decisions before a heatwave hits," Sarah says. Additionally, sap flow sensors and pressure chambers are valuable tools for monitoring vine hydration and ensuring precise water management.
Sarah's research also underscores the importance of enhancing soil health through regenerative practices. By incorporating cover cropping, reducing tillage, and increasing organic matter in the soil, vineyards can improve water retention and root health, making vines more resilient to heat stress.
"Healthy soil is the foundation of a resilient vineyard. Practices that improve soil structure and microbial activity can significantly enhance a vine's ability to withstand extreme temperatures," Sarah states.
In addition to these technological and soil health practices, Sarah's report explores the use of artificial cooling methods, such as misters and overhead sprinklers, to reduce canopy temperature during heatwaves. She also highlights the effectiveness of shade cloths and reflective sprays in protecting grape bunches from direct sunlight. "Implementing these cooling techniques can help maintain grape quality and prevent heat damage, which is crucial for producing high-quality wine," Sarah notes.
Reflecting on her Nuffield Scholarship journey, Sarah shares, "The experience has been transformative, providing me with invaluable insights and a global perspective on viticulture. The connections I've made and the knowledge I've gained have significantly influenced my approach to managing heat stress in vineyards."
Sarah Keough in Zimbabwe, 2023
Sarah presented her research at the 2023 National Conference in Perth, Western Australia, and a link to her presentation can be found here
Don't miss the 2024 National Conference in Launceston, Tasmania on 2-4 September, with 29 returning scholars presenting their research. Register here
Sarah Keough's report can be found here
