The manufacture of straight, mixed, compound and complex nitrogenous, phosphate and potash fertilizers; the formulation and preparation of ready-to-use pesticides, insecticides fungicides and herbicides and of concentrates for this purpose. Included are sulphuric, phosphoric and nitric acid plants operated in conjunction with fertilizer plants which can not be separately reported; establishments primarily engaged in manufacturing urea are classified in group 3511. The manufacturing of basic or technical chemicals used in preparing pesticides, such as lead and calcium arsenates, copper sulfate, DDT, BHC, is classified in group 3511.