Byproduct from Beer when mixed with manure becomes excellent pesticide

Scientists have shown through a study that byproducts from the beer and agricultural industry have been shown to reduce numbers of root-knot nematodes and increase yields of lettuce crops

In this study published to Frontiers in Sustainable Food Systems, researchers from the Neiker Basque Institute for Agricultural Research and Development in Spain investigated using agricultural by-products rapeseed cake and beer bagasse (spent beer grains), along with fresh cow manure as two organic biodisinfestation treatments. The lead author Maite Gandariasbeitia explains: “Rapeseed cake and beer bagasse are two potential organic treatments which have shown really positive results in previous studies.

The higher content of nitrogen supports growth of beneficial microorganisms in the soil thereby breaking down organic matter like manure and kill off nematodes and other parasites which damage crops.

Gandariasbeitia also highlights how nematodes can negatively impact crop yields: “Root-knot nematodes are a type of common soil parasite which penetrate a plant’s root tissue to lay their eggs and this activity causes galls, or knot-like swellings, to form on the root,” she says.

“This damage negatively impacts root development and means the crop can’t take up nutrients efficiently, slowing plant growth and ultimately, leading to reduced yields for farmers.”

To disinfest the soil and reduce these nematode populations, beer bagasse and rapeseed cake were incorporated into the soil with fresh cow manure as a potential organic treatment. After the first crop post-treatment, the researchers found a significant reduction in galling on plant roots.

Plots also demonstrated increased yields by around 15% compared to the control plots after one year. Additionally, the organic matter treatment boosted populations of beneficial microorganisms in the soils, as demonstrated by a significantly higher soil respiration rate.

The study demonstrates that these agricultural byproducts are an effective treatment for root-knot nematodes and other soil parasites, achieving higher crop yields as well as promoting sustainable food systems to reduce waste from the agricultural industry. Gandariasbeitia highlights that further research is needed to explore other potential organic treatments that could be used in a similar way: “There are still many questions to answer so that we can gain a better understanding of what happens in the soil during and after these biodisinfestation treatments.

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