Episode 8: Vom Mist zum Dünger

8 Jun 2026 · 23 min
23:05

In this children‑focused episode of the John‑Deere Entdecker Podcast, hosts Emma and Alex visit farmer Herr Huber’s farm to explore his modern biogas plant. The episode begins with the hosts’ curiosity about turning cow manure into electricity and proceeds with a tour of the farm, showcasing the John‑Deere 6R 250 tractor and a special manure spreader used to transport fresh slurry to the fermenter. Herr Huber explains the anaerobic digestion process: manure (and other organic residues) is placed in a sealed fermenter where bacteria break it down at 38‑40 °C, producing biogas (mainly methane). The biogas fuels a gas engine in a block‑heat‑power plant (BHKW), generating about 75 kW of electricity (enough for ~150 households) and useful heat for the farm. The remaining digestate (Gärrest) is a nutrient‑rich fertilizer, more readily absorbed by plants than raw manure, and is applied precisely using a John‑Deere tractor equipped with a GPS‑guided spreader and a slurry‑tube system. Throughout the tour, the hosts discuss the environmental benefits of capturing methane (preventing its release as a potent greenhouse gas) and the circular economy: cows eat feed grown with the digestate, producing manure that fuels the plant again. Quantitative details are given (≈50 kg manure per cow per day, 120 cows, 1 000 m³ fermenter, 12 000 L digestate tank, ~10 000 biogas plants in Germany). The episode ends with three quiz questions for listeners about the fermenter name, the products of the BHKW, and why the digestate is a superior fertilizer, and teases the next episode on harvest machinery. The tone is conversational, enthusiastic, and instructional, aiming to make complex agricultural and energy concepts accessible to children.

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