ASSOCIATION OF AMERICAN PLANT FOOD CONTROL OFFICIALS (AAPFCO) OFFICIAL FERTILIZER DEFINITIONS
MAGNESIUM (Mg) PRODUCTS

Mg-5 — Brucite

Is the naturally occurring mineral form of magnesium hydroxide (magnesium hydroxide).
(Official 2013)

Mg-1 — Calcined Brucite

Is a magnesium product concentrated from brucite limestone. It consists chiefly of magnesium oxide with lesser amounts of calcium hydroxide, silicates, and sesquioxides.
(Official 1968)

Mg-2 — High Magnesic Liming Materials

Are those containing at least six percent (6%) magnesium.
(Official 1976)

Mg-7 — Magnesium Amino Acid Complex

Is a complex of magnesium (II) with an amino acid product and is commonly expressed as the Mg amino acid salt, e.g., magnesium glycinate.
(Tentative WA 2018, Official SA 2018)

Mg-6 — Magnesium Gluconate

Is a magnesium complex of gluconic acid, and is commonly expressed as Mg gluconate.
(Tentative SA 2016, Official WA 2017)

Mg-3 — Magnesium EAHP

Is the chelate of any soluble magnesium salt and Ethanol, 2-amino-2-hydroxy-1,2,3- propanetricarboxylate.(Tentative WA 2018, Official SA 2018)

Mg-4 — Magnesium Sulfate

Is a product consisting chiefly of that material with or without combined water: epsom salts (MgSO₄·7H₂O), kieserite (MgSO₄·H₂O) and calcined kieserite (MgSO₄).
(Official 1958)