Plant physiology is highly responsive to the prevailing environmental conditions, and plays a critical role in crop productivity. Active management of plant physiology, therefore, plays an important role in crop production. A diverse group of biochemical compounds known as plant growth regulators (PGRs) includes both natural and synthetic versions of natural substances that affect plant physiology.
A few examples of management tactics where PGRs are utlitized include thinning fruit on fruit trees in order to reduce over-cropping, thereby increasing fruit size, and using PGRs to increase flower and fruit set. PGRs are also used to improve crop tolerance to a variety of abiotic stresses such as temperature and drought, and for managing fruit maturity during and after harvest to maintain a high level of fruit quality.