Ammonium sulfite is recommended for use as an agricultural fertilizer.

    In recent years, with the development of ammonium sulfite-based pulp and papermaking technology, the process for producing ammonium sulfite has advanced rapidly.

    Through an overview of the fertilizer efficacy trials of ammonium sulfite, along with discussions on the production process and construction costs of ammonium sulfite facilities, as well as the cost structure of ammonium sulfite products, this article presents the author's perspectives for reference by relevant authorities.

Ammonium sulfite is a high-quality, fast-acting nitrogen fertilizer.

Ammonium sulfite contains nitrogen, a essential nutrient for plant growth. It is a high-quality, rapid-acting nitrogen fertilizer.

    At the sulfuric acid workshop of a chemical plant in Wenzhou, Zhejiang, the (NH₄)₂SO₃–NH₄HSO₃ mother liquor obtained from the ammonia process tail gas recovery unit was first sold as a product to farmers before 1975. The farmers diluted the mother liquor 100-fold with water and used it directly as fertilizer. Over the years, no incidents of crop damage have occurred. This marked an initial attempt to utilize ammonium sulfite solution directly as fertilizer.

    The Institute of Plant Protection at the Chinese Academy of Agricultural Sciences conducted extensive multi-year trials to evaluate the fertilizer efficacy of ammonium sulfite. The results demonstrated that ammonium sulfite, when applied, yields rapid effects comparable to other chemical nitrogen fertilizers, promoting healthy crop growth and significant yield increases. The trials were conducted both in potted plants and field conditions, using rice, wheat, cotton, and corn as test crops. The findings are presented in Tables 1 and 2.