This book has been authored by an individual with 28 years of teaching experience, with the aim of providing a comprehensive textbook on fertilizers for undergraduate and postgraduate students, researchers, and educators. It covers topics such as the classification of fertilizers, the manufacturing process of nitrogenous, phosphatic, and potassium fertilizers, and the importance of slow-release or controlled-release fertilizers. The book provides a systematic and in-depth coverage of fertilizer technology and their application under different soil and plant conditions. It is intended to serve as a valuable resource for individuals involved in fertilizer use and agricultural development, including agricultural administrators, researchers, teachers, students, soil chemists, extension workers, farmers, field advisors, marketing staff of the fertilizer industry, trading organizations, training centers, and international institutes. It is designed to provide the basic principles and theories used in the fertilizer industry.

Dipak Ranjan Biswas has an excellent academic carrier with undergraduate from Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal; Post-Graduate and Ph.D. at Indian Agricultural Research Institute(IARI), New Delhi. Dr. Biswas is an excellent teacher, presently working as Principal Scientist, Division of Soil Science and Agricultural Chemistry, ICAR-IARI, New Delhi. He had a long tenure of 28 years as teacher and 34 years as researchers at the ICAR-IARI, New Delhi. He has guided/guiding several Ph.D/M.Sc. students, most of them joined in the Agricultural Research Service of the ICAR as Scientist. It brings together the accumulated experience and knowledge gained during his professional career on the use and management of fertilizers.

Dr. Biswas is widely known for his work in soil fertility and fertilizer use and development of novel fertilizers. Presently, Dr. Biswas is discharging his responsibilities in the national level as the Secretary, Indian Society of Soil Science and Editor (Ex-Officio) of the Journal of the Indian Society of Soil Science, New Delhi, contributing significantly in shaping soil science research and education in the country since 2013. He has been elected as the President of the Section of Agriculture & Forestry Sciences in the 108th Session (2020-2022) of the Indian Science Congress Association (ISCA), Kolkata. He is discharging his responsibilities as the Honorary Editor of Everyman's Science published by the ISCA.

1. Introduction 2. Nitrogenous Fertilizers 3. Phosphatic Fertilizers 4. Potassium Fertilizer 5. Secondary Nutrient Fertilizers 6. Micronutrients Fertilizers 7. Slow-Release or Controlled-Release Fertilizers 8. Fertiliser Control Order and Fertilisers Specifications 9.  References