 In 1967, a research and industrial plant for the production of ion-exchange resin was put into operation.In May 1970, the second stage of ammonia production with a capacity of 400,000 tons of ammonia per year was put into operation, followed by a plant of nitric acid production with a capacity of 360,000 tons per year.In 1979, an ammonia production plant with a capacity of 450,000 tons per year was put into operation, and the following year, a urea production plant with a capacity of 330,000 tons per year was launched.