Stanley Chemical Fertilizer, Yangfeng Chemical Fertilizer, Jin Zhengda Chemical Fertilizer, etc. According to the trademark website, QS logo fertilizers include Lubei Fertilizer, Jin Zhengda Fertilizer, Yuntianhua Fertilizer, Yangfeng Fertilizer, Fengxi Fertilizer, Yihua Fertilizer, Stanley Fertilizer, Huajin Fertilizer and Hongfu Fertilizer. Fertilizer refers to a kind of substance that provides one or more essential nutrients for plants, improves soil properties and improves soil fertility level, and is one of the material bases of agricultural production.