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Discover LudwigThe phrase 'night soil' is correct and usable in written English.
It is usually used to refer to human excrement collected at night from cesspools or latrines, and then used as fertilizer. For example, "Since the 18th century, night soil has been used to increase crop yield in Chinese and Japanese fields."
Dictionary
night soil
noun
Human faeces.
Exact(59)
Soil was improved by adding manure and night soil.
Night soil, oil cakes, and ash fertilized the soil.
And there were the men of the night soil.
The spring that supplied the White House was close to a depository for night soil.
In China, the proverb said: "Treasure night soil as if it were gold".
"After another two feet they reached the night soil, which was similar to a black gooey mud".
Karāchi Municipal Corporation maintains a fleet of vehicles for refuse collection, night soil removal, dog catching, and antimalarial and antifly operations.
One of the most unpleasant occupations of the day, of which there were many, was that of the night soil man.
"After another two feet they reached the night soil, which was similar to a black gooey mud". But the gooeyness wasn't what bothered them.
The first privy diggers, he found, were Washington's poorer residents, "scavengers who cleaned privies and sold night soil to farmers for fertilizer".
Similar(1)
Aside from livestock manure, suitable feedstocks for household, community, and institutional biodigesters include crop residues, night soil/domestic sewage, and the organic fraction of municipal solid waste (OFMSW).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com