Translation guide
Guano refers to the accumulated excrement of seabirds or bats, often used as fertilizer. In Japanese, the most common term is グアノ, a direct loanword. There is also a native term 鳥糞石, but it is less common and more technical.
The learner wants to refer to guano as a substance, especially in the context of fertilizer or natural history.
This is the standard loanword for guano, widely understood in contexts like agriculture, gardening, and history.
この肥料はグアノから作られています。
This fertilizer is made from guano.
A native Japanese term literally meaning 'bird droppings stone'. It is more technical and less common than グアノ. Might be encountered in scientific or historical texts.
19世紀には鳥糞石が重要な肥料でした。
In the 19th century, guano was an important fertilizer.