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IVES 9 IVES Conference Series 9 Does foliar fertilization with Seaweed improve the productivity and quality of ‘Merlot’ grape must?

Does foliar fertilization with Seaweed improve the productivity and quality of ‘Merlot’ grape must?


Developing technologies that help vines survive and produce in quantity and quality within current times is mandatory. In this sense, in the 2021/2022 agricultural harvest, the influence of the foliar application of seaweed – Laminaria japonica was studied, aiming at productivity and quality of the must in the ‘Merlot’ grape. In the city of “Santana do Livramento”, “Rio Grande do Sul” (RS), Brazil; in a 15-year-old commercial vineyard of ‘Merlot’ clone ENTAV-INRA® 347, grafted onto ‘SO4’ rootstock, the following treatments were applied on 6 occasions: No treatment (control) and; Foliar application of Laminaria japonica seaweed (commercial product: Exal (ALAS), 2 kg ha-1) The treatments consisted of 4 replications (interval) and each interval had 4 plants. The response variables evaluated at harvest time were: productivity (t ha-1). Using the WineScanTM SO2 equipment (FOSS®, Denmark) the must was evaluated: density [g (cm3)-1], sugars (g L-1), pH, tartaric acid (g L-1), malic acid (g L-1), gluconic acid (g L-1), ammonia content (mg L-1), potassium content (mg L-1), total acidity (g L-1 in tartaric acid). The treatment with foliar application of seaweed stood out in productivity (11.3 t ha-1) when compared to the control treatment (9.8 t ha-1). In the must, the potassium content showed significant differences between the treatments, with a reduced level being obtained with the foliar application of seaweed. It is preliminarily concluded that the application of foliar fertilizer based on seaweed (Laminaria japonica) increased the productivity of ‘Merlot’ vines and reduced the potassium content in the must.

Acknowledgements: To the Company “Algas” América Latina Agricultura Sustentável (ALAS), in the names of its managing partners, Luis Augusto Bennemann de Souza and Fernando Carbonari Collares, for the donation of organic fertilizer composed of Marine Algae (Exal), and for the contribution with some inputs to the execution of this research.


Publication date: June 13, 2024

Issue: Open GPB 2024

Type: Poster


Juan Saavedra del Aguila1*, Isabel Cristina Robaina Figueira Freitas1, Jansen Moreira Silveira1, Joana Darque Ribeiro Ozório1, Etiane Skrebsky Quadros1, Fabrício Domingues2, Lília Sichmann Heiffig-del Aguila3

1 Federal University of Pampa (UNIPAMPA)/Campus Dom Pedrito, Bachelor’s Degree in Enology
2 Consultant in Winegrowing and Agribusiness Management
3 Embrapa Temperate Climate

Contact the author*


Vitis vinifera, sustainability, organic fertilizer, organic production, climate change


IVES Conference Series | Open GPB | Open GPB 2024


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