noun
salt industry; salt manufacturing industry
Refers to the business sector involved in the production of salt.
日本の製塩業は、かつて専売制の下にあった。
The Japanese salt industry was once under a monopoly system.
製塩 refers to salt production in general, while 製塩業 specifically denotes the industry or business of salt manufacturing.
Compound of 製塩 (salt production) + 業 (industry, business).