Definitional Glossary of Agricultural Terms includes the terms related to crop sciences, e.g. genetics, biotechnology, plant breeding, plant physiology and biochemistry, plant pathology, plant protection, horticulture, seed science and technology, statistics, internet, library and information sciences, etc. Very often descriptive text, related terms, synonyms and antonyms are given in addition to the proper definition to help the reader to understand the term in its context and practical use. Useful information pertaining to cell biology, agronomy, soils, soil fertility, manures and fertilizers, organic farming and crop residues, etc. have been presented in tabular form. Tables relating to symbols, units of measurements and conversion factors are also provided.