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Biogas bounty: Kenyan farmer Josphat Muchiri looks at his flourishing coffee trees — their harvest has doubled thanks to fertiliser from his cow-dung biodigester, he saysBiogas bounty: Kenyan farmer Josphat Muchiri looks at his flourishing coffee trees — their harvest has doubled thanks to fertiliser from his cow-dung biodigester, he says (AFP Photo/TONY KARUMBA)

Kiambu (Kenya) (AFP) – In 35 years working the land, Kenyan farmer Josphat Muchiri Njonge has never seen his coffee shrubs burst with so much fruit on his verdant hillside plot outside bustling Nairobi.

Same too goes for the banana and avocado trees swaying on his two-acre (0.8 hectare) family farm in Kiambu. The plot is also lush with kale, spinach, maize and the cereal amaranth.

His secret weapon

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