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For the first time, a study has analysed soils in vineyards for the smallest plastic residues (microplastics). The study shows a high microplastic content in vineyards - more than in other agricultural soils. It was carried out by researchers from the University of Trier and the Technical University of Darmstadt, who are now warning of the risks.
Plastic is used in many forms in viticulture: As nets to protect against hail or animals, as clips to secure vines or as cutting threads for mowers. When these are damaged or age, they break down into tiny particles. They are therefore considered the main source of microplastics in vineyards. The particles can be transported by rain into rivers and lakes and can also end up in drinking water. According to the authors of the study, chemical pesticides, which can also contain microplastics, probably play a lesser role.
The soil samples were taken from vineyards along the Moselle and Saar rivers. It is reasonable to assume that the contamination is similarly high in other wine-growing regions. It turned out that there are hardly any differences in the microplastic content of conventionally and organically farmed vineyards. However, the variety of plastics found under organic cultivation is significantly lower.
Microplastics in the soil can have a negative impact on soil functions such as nutrient turnover. However, the authors of the study say that there is currently no direct risk to viticulture or even wine. However, they advocate the increased use of plastic-free materials for viticulture.
(al / Source: University of Trier)