Bio-stimulants are among the natural preparations that improve the general health, vitality, and growth of plants and protect them against infections. They can be successfully used in both agri- and horticultural crops. The main active substances used in such preparations are humic and fulvic acids, protein hydrolysates, compounds containing nitrogen, seaweed extracts, beneficial fungi, and bacteria. Bio-stimulant formulations may be single- or   multicomponent, but the synergic action of several different components has been observed. Many groups of bio-stimulants have been distinguished through their method of application (soil, foliar), the material from which they were produced (plant, animal), or the process by which they were created (hydrolysis, fermentation, extraction). Natural soil stimulants can induce the development of beneficial soil organisms that provide substrates for plant growth. The use of natural preparations that are not harmful to the environment is particularly important in connection with the progressive processes of soil degradation and atmospheric pollution. This review gives an overview of the importance and influence of different natural plant bio-stimulants on both the yield and quality of crops.

There is an urgent need for getting the overall ideas in these aspects in the form of book dealing with recent

The present book entitle.” Basics concepts of Bio-stimulant” has been designed to fullfil the long need of students of Agriculture and Horticulture, researcher’s progressive farmers and persons want to have a recent trend in agriculture farming, covering the various basics key points to understanding the clear role of bio-stimulant. This book is structured into ten chapters, each focusing on distinct aspects of the role of bio-stimulants in vegetable crop production

Strenuous efforts have been made to compile the information & literatures from various sources including published literature, research papers, books, personal experience etc.

The authors are sincerely acknowledging the contribution of authors and publisher whose publication are used while preparing this manuscript.

      Though every effort has been made by us to ensure correctness of the contents of the book, some errors due to our personal limitations might have been remained. Therefore, we shall sincerely appreciate receiving suggestions as well as constructive criticisms from the learned readers for further improvement of the book.