Heilongjiang DEWO Changfeng Biotechnology Development Co., Ltd.: Heilongjiang DEWO Changfeng Biotechnology Development Co., Ltd is located in beautiful Nehe in Qiqihar, with an area of 20,000 square meters. It is a private high-tech joint-stock enterprise specializing in the production of organic fertilizer, biological organic fertilizer, organic and inorganic compound fertilizer, organic fertilizer production-supporting biological agents, organic fertilizer production equipment and organic fertilizer spreaders with the technical support of Chinese Academy of Sciences, Harbin Institute of Technology, China Agricultural University, Northeast Agricultural University, Cornell University in the US, Wageningen University & Research in the Netherlands and many other famous Chinese and foreign universities and research institutes. The company produces various high-efficiency organic fertilizers with livestock manure and crop straws as main raw materials by fermentation technology and production process. Its operation mode not only solves the problems of rural non-point source pollution caused by manure generated by livestock and poultry breeding in rural areas and atmospheric environmental pollution caused by burning crop straws, but also provides high-quality organic fertilizers for black land protection and green ecological organic agriculture.