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1993年山东省临沂市化工总厂在原3万吨/年磷铵装置上试生产硫基N、P、K高效复合肥6万吨/
Linyi City, Shandong Province in 1993 Chemical Plant in the original 30,000 tons / year AP plant trial production of sulfur-based N, P, K fertilizer 60,000 tons /