MAG-4 provides turf and crops with magnesium, sulfur and Biofeed’s exclusive Amino-Cell Technology® ACT. Magnesium readily enters the plant through foliar or soil application to supplement deficiency by supplying plant available Magnesium. Magnesium (Mg) is one of 18 nutrients essential for plant growth. metabolism.


MAG-4 provides magnesium which is actively involved in photosynthesis as the central element of the chlorophyll molecule. Magnesium plays an important role in plant respiration and energy metabolism.


  • Key element in chlorophyll production and function
  • Required for efficient plant enzyme activity
  • Regulates plant respiration and energy metabolism
  • Supports protein synthesis
  • May reduce plant disease occurrence
  • Enhances fruit ripening
  • Increases shelf-life of most vegetable crops
  • Enables greater BRIX production

Sulfur (S)……………………………….5.0%
Magnesium (Mg)……………………4.0%

Derived from Magnesium Sulfate.

MAG-4 contains Biofeed’s exclusive Amino-Cell Technology® (ACT).



MAG-4 is highly concentrated for pro-level performance and value. Dilute with water to ensure adequate coverage. Jar test for compatibility prior to final tank mixing with other products.


Side Dress: Apply 2-3 gallons in a minimum of 10 gallons of water per acre along with nitrogen.
Drip Irrigation: Apply 1-2 gallons per acre.
Soil: Apply 1-2 gallons per acre.
Foliar: Row & Field Crops – Apply 1-4 quarts in a minimum of 10 gallons of water per acre.


Foliar: Apply 1-4 quarts in 25-50 gallons of water per acre, or 4-8 ounces in 5-10 gallons of water per 1000 square feet. Apply every 7-14 days or as needed with sprayer.


ACT® | L-Form Amino Acids, Carbon, Hydrogen, Oxygen and Nitrogen that are key building blocks in all plant life. Contains freshwater algae.

BRIX | Enhanced natural sugar production (BRIX) promotes strong stem, leaf, and deeper root growth. BRIX also promotes plant vitality which helps reduce disease occurrence.

CHLOROPHYLL | A natural compound present in green plants that gives them their color. It helps plants to absorb energy from the sun as they undergo the process of photosynthesis.

MAGNESIUM | Magnesium is required for photosynthesis in plants. Without magnesium, chlorophyll cannot capture sun energy needed for photosynthesis. In short, magnesium is required to give turf its green color.

PHOTOSYNTHESIS | A chemical process that uses sunlight to turn carbon dioxide into sugars. The sugars are used as energy, and to build other kinds of molecules.

SULFUR | Used in the formation of amino acids, proteins, and oils. It is necessary for chlorophyll formation

MAG-4 Liquid Magnesium fertilizer

United States of America
2.5-gallon (9.46 L) jugs
55-gallon (208.2 L) drum
275-gallon (1040.99 L) tote
Other Countries
10-Liter (2.64 gal) jug
208-Liter (54.95 gal) drum
1040-Liter (274.74 gal) tote

Technical Bulletin – English
Safety Data Sheet – English
Ficha Tecnica – Spanish