Agricultural biostimulants are a group of substances or microorganisms that are applied to plants or soils to improve crop vigour, yields, quality and tolerance of abiotic stresses. This book reviews their role in crop production and agricultural sustainability.

Focusing on recent progress on biostimulants and their role in crop production and agricultural sustainability, this book includes:
- 31 chapters on a wide range of biostimulants and their role in plant growth stimulation and stress tolerance.
- Mechanism of actions of diverse groups of biostimulants, such as trace elements, plant and seaweed extracts, humic substances, polyamines, osmolytes, vitamins, nanoparticles and microorganisms.
- New promising biostimulants with novel modes of action.