A crude sodium nitrate occurring naturally in Chile, Peru, and the southwest United States, used as fertilizer.

一种粗糙的硝酸纳，存在于智利、秘鲁和美国西南部，用作肥料。

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In the dry uplands of Chile, rich mineral nitrate deposits were then found, and gradually took the place of guano in the late 19th century.

ECONOMIST: The story of man's staple food

The nitrate mines fuelled Chile's economy and fertilised Europe's farms.

ECONOMIST: The story of wheat: Ears of plenty | The