shandong baoyuan biotechnology co., ltd. is a national high-tech enterprise dedicated to the research and development, production and sales of new ecological functional fertilizers for china's green ecological agriculture. more than 80 varieties of four major series, including organic and inorganic compound fertilizer series, chelating fertilizer series, functional fertilizer series, and other new fertilizers, have been developed, and the production process and product quality are leading in china. the url is