General Information



NOTE: Gibberellic Acid is an extremely potent plant growth regulator. For best results, read all directions for use thoroughly. Consult your local experiment station specialist, distributor, or the Nufarm agricultural specialist in your area for the spray schedule best suited to your conditions.

Discard any unused spray material at the end of each day. Prepare solution concentrations by mixing the required amount of product with water only in a clean, empty spray tank. Refer to individual crop sections and rate conversion tables provided in the labeling for the amount of GIBGRO 4LS to be applied.

Use only as directed. The label must be read thoroughly and understood before making applications. Effectiveness requires that all parts of plant or crop must receive spray or desired result will not occur, so spray thoroughly. When a range of rates is indicated, use the concentration and spray volume recommended locally.

Data concerning the compatibility of GIBGRO 4LS with other agricultural compounds is not available, except where specified.


To assure the compatibility of GIBGRO 4LS with other products, pour the products into a small container of water in the correct proportions.

After thorough mixing, let stand for 5 minutes. If the combination remains mixed, or can be remixed readily, the mixture is compatible.

Limitations, Restrictions, and Exceptions


All states except California.

To promote early plant growth and increase seedling vigor: Apply 1 to 6 grams a.i. per acre as an in-furrow application to seed or as a foliar application from the cotyledon leaf stage through the 7 leaf/node stage. Up to three applications can be made.

To mix, fill the treatment tank with half the final tank mix volume. Add the required amount of GIBGRO 4LS and mix thoroughly while adding water to the desired final volume. Compatibility information regarding tank mixtures of GIBGRO 4LS with herbicides used in cotton is not available. Aerial Application: use a spray system capable of producing a uniform spray pattern of medium to fine spray droplets at 10 gallons per acre (GPA). Apply no less than 3 GPA of total spray volume. Low pressure ground sprayers equipped with boom and flat fan nozzles: apply 10 to 15 GPA spray volume. Dispose of unused spray mixture according to the label directions at the end of the day.

NOTE: Use higher rates when temperatures will likely average 75°F or less during the 14 days following the application. Do not apply more often than necessary to achieve the desired height, as overdosage will result in excessive growth. Do not apply to cotton plants under drought stress.

Restricted Entry Interval

4 hours

Exception: If the product is soil-injected or soil-incorporated, the Worker Protection Standard, under certain circumstances, allows workers to enter the treated area if there will be no contact with anything that has been treated.