Gibberellic Trial 2015
Up to three applications of Gibberellic Acid (Gibb) on ryegrass plots in July to September gave good immediate pasture responses of 400 – 600 kgDM/ha. However most of this additional pasture was lost afterwards due to “post-Gibb depression.” Repeat applications of Gibb delayed this depression in pasture growth.
This is consistent with other trial work, showing that Gibb is a useful tool for bringing pasture growth forward in early spring but does not increase overall DM production, and there can be a significant reduction in pasture growth following the last application.