AHDB outlines biostimulants basics
The reviewers found that nine of the 11 product categories were associated with a statistically significant increase in yield in at least one experiment. For the most common product categories – seaweed extracts, humic substances, phosphite and plant-growth-promoting bacteria – statistically significant yield responses were observed for 3/7, 3/4, 4/17 and 13/15 cereal experiments, respectively. Data for oilseed rape was found to be lacking for all products, and no firm conclusions could be made.