The article presents the result of an investigation and explains the current problems of the construction of a fertilizer plant in the bay of Topolobampo, Sinaloa, established by Gas y Petroquímica de Occidente, a Mexican subsidiary of the Swiss-German Holding Proman, which will generate anhydrous ammonia as a fertilizer input, and therefore, the need to implement real protection based on public policies focused on the preservation of the bay, which is a Ramsar site. The construction of the plant began in 2014; forging confrontations with residents canceling its construction. Therefore, we detail the impacts in case of construction of the plant, proposing protection of the bay based on public policies for the benefit of the site. Keywords: Fertilizers, ammonia, Ramsar, environmental destruction. [ABSTRACT FROM AUTHOR]