A comprehensive manual presents practical methods for analyzing fertilizers and related agricultural materials, emphasizing sampling, sample preparation, and the chemical estimation of phosphates and other fertilizing constituents. It surveys procedures for mineral and organic materials, compares solvent-based and colorimetric approaches such as molybdate and citrate techniques, describes volumetric precipitations and titrations, and treats analyses of basic slags and mixed fertilizers. The volume also addresses valuation, sources of fertilizing materials, common waste-derived products, and laboratory apparatus and protocols, providing step-by-step techniques and comparative notes for analysts, teachers, and students.