General Information


Phos-K-Mag LS is a formulated treatment for phosphorus and magnesium deficiency in potatoes, fruit, and other crops. This product may be applied using a variety of agricultural application equipment and techniques. This product is recommended for use as a supplement to a regular fertilizer program only. It is not intended nor implied to be a substitute for sound soil fertilization and good conventional cultural practices.

For additional information on product or programs or if you are unfamiliar with any of the application methods, contact your local Helena representative or authorized Helena dealer.

Avoid application under extremes of climate, e.g., rapid drying conditions, extremely slow-drying conditions, frost, rain, or when frost or rain are anticipated.


Shake the container thoroughly before use.

Ground Applications: This product may be applied by conventional ground rig in volumes ranging from full dilute to concentrate.

Fertigation: This product may be applied in overhead irrigation systems. Do not apply with more than ¼ inch water.

Drip Irrigation: This product may be injected into drip irrigation systems.

Limitations, Restrictions, and Exceptions

4 to 6 applications of 2 quarts/acre from the end of flowering. Repeat applications at 10 to 14 day intervals. Water rate: 50 to 100 gallons/acre.