Good Landlord of the Tang Dynasty.

Summary

Zhang Chao and villagers gathered around a fermentation pit designed for biogas production. After sealing manure and organic materials, biogas accumulated, causing pressure that eventually released a foul odor. Zhang warned villagers about the toxicity of biogas but assured them of safety at a distance. The fermentation was successful, yielding liquid fertilizer rich in nutrients, which Zhang planned to apply in his vegetable garden. He directed villagers to use the biogas fertilizer immediately, emphasizing its effectiveness over traditional compost. Skeptical villagers agreed to compare results with regular manure, aiming to demonstrate the superior benefits of biogas fertilizer.

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