ASSOCIATION OF AMERICAN PLANT FOOD CONTROL OFFICIALS (AAPFCO) OFFICIAL FERTILIZER DEFINITIONS
Micronutrient Products

 

Boron (B)
 

B-1 — Borax (sodium tetraborate), and its hydrated forms

Is a sodium borate material. Anhydrous borax (sodium tetraborate) has the formula of Na₂B₄O₇.
(Official 2000)

B-2 — Boric Acid

Is a crystalline or powdered product, and has the formula of H₃BO₃.
(Official 2000)

B-9 — Boron Ethanolamine

Is an organic complex of ethanolamine and boric acid.
(Official 2005)

B-3 — Boron Frits

Are boron sources incorporated into a glassy matrix which provide a type of controller release, depending on the particle size and composition.
(Official 2000)

B-4 — Colemanite, and its hydrated forms

Is a calcium borate material. Anhydrous colemanite has the formula of Ca₂B₆O₁₁.
(Official 2000)

B-8 — Disodium Octaborate, and its hydrated forms

Is a sodium borate material. Anhydrous disodium octaborate has the formula Na₂B₈O₁₃.
(Official 2000)

B-5 — Liquid Boron Products

Are solutions consisting of boric acid or sodium borate compounds in an organic solvent.
(Official 2000)

B-6 — Sodium Borate Derivatives, and their hydrated forms

Are products derived from sodium borate-containing minerals.
(Official 2000)

B-7 — Ulexite, and its hydrated forms

Is a sodium-calcium borate material. Anhydrous ulexite has the formula of NaCaB₅O₉.
(Official 2000)

 

Cobalt (Co)

 

Co-1 — Cobalt EAHP

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

Co-2 — Cobalt Sulfate

Cobalt sulfate and its hydrated forms, is a cobalt salt of sulfuric acid and has the formula of CoSO₄.
(Official 2014)

 

Copper (Cu)
 

Cu-2 — Copper (I) Chloride (cuprous chloride), and its hydrated forms

Is a copper salt of hydrochloric acid. Anhydrous copper (I) chloride (cuprous chloride) has the formula of CuCl.
(Official 2000)

Cu-5 — Copper (I) Oxide (cuprous oxide, red copper oxide)

Is an oxide of copper with the formula of Cu₂O.
(Official 2000)

Cu-1 — Copper (II) Carbonate (cupric carbonate, copper carbonate)

Is a copper salt of carbonic acid with the formula of CuCO₃.
(Official 2000)

Cu-3 — Copper (II) Chloride (cupric chloride, copper chloride), and its hydrated forms

Is a copper salt of hydrochloric acid. Anhydrous copper (II) chloride (cupric chloride) has the formula of CuCl₂.
(Official 2000)

Cu-10 — Copper (II) Citrate (copper citrate, cupric citrate)

Is a copper (II) chelate of citric acid, and is commonly expressed as Cu citrate.
(Official 2000)

Cu-17 — Copper (II) IDS

Is a copper (II) chelate of iminodisuccinic acid and is commonly expressed as CuIDS.
(Official 2003)

Cu-4 — Copper (II) Nitrate (cupric nitrate, copper nitrate)

Is a copper salt of nitric acid with the formula of Cu(NO₃)₂.
(Official 2000)

Cu-6 — Copper (II) Oxide (cupric oxide, black copper oxide)

Is an oxide of copper with the formula of CuO.
(Official 2000)

Cu-8 — Copper (II) Sulfate (copper sulfate, cupric sulfate), and its hydrated forms

Is a copper salt of sulfuric acid. Anhydrous copper (II) sulfate has the formula of CuSO₄.
(Official 2000)

Cu-13 — Copper Amino Acid Complex

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

Cu-11 — Copper EDTA

Is a copper (II) chelate of ethylenediaminetetraacetic acid, and is commonly expressed as CuEDTA.
(Official 2000)

Cu-9 — Copper Frits

Are copper sources incorporated into a glassy matrix which provide a type of controlled release, depending on the particle size and composition.
(Official 2000)

Cu-12 — Copper Glucoheptonate

Is a copper (II) complex of glucoheptonic acid, and is commonly expressed as Cu glucoheptonate.
(Tentative WA 2020, Official WA 2022)

Cu-14 — Copper Humate

Is an organic complex of copper (II) with a humic acid product, and is commonly expressed as Cu humate.
(Official 2000)

Cu-15 — Copper Lignosulfonate 

Is a complex of the copper (II) salt of lignosulfonic acid.
(Tentative SA 2018, Official 2019)

Cu-20 — Copper EAHP

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

Cu-18 — Copper Oxychloride

Is a mixture of variable proportions of copper (II) hydroxide and copper (II) chloride resulting from the partial acidulation of copper oxide with hydrochloric acid. 
(Official 2005)

Cu-7 — Copper Oxysulfate

Is a mixture of variable proportions of copper oxide and copper sulfate resulting from the partial acidulation of copper oxide with sulfuric acid.
(Official 2000)

Cu-19 — Copper Polysaccharide

Is an organic compound of copper with polysaccharide long chain carbohydrates.
(Official 2006)

Cu-16 — Copper Sucrate

Is an organic complex of copper (II) with a short chain (monosaccharide or disaccharide) aldehyde-type reducing sugar.
(Official 2000)

 

Iron (Fe)
 

Fe-19 — Ferrous Ammonium Sulfate (Iron (II) Ammonium Sulfate), and its hydrated forms 

Also known as ammonium ferrous sulfate is a double iron (II) salt, (NH₄)₂Fe(SO₄)₂·6H₂O resulting from the ammonization of sulfuric acid containing iron. Anhydrous ferrous ammonium sulfate has the formula FeSO₄·(NH₄)₂SO₄.
(Official 2015, SA)

Fe-1 — Iron (II) Carbonate (ferrous carbonate, iron carbonate)

Is an iron (II) salt of carbonic acid with the formula of FeCO₃.
(Official 2000)

Fe-20 — Iron (II) IDS 

Is an iron (II) chelate of iminodisuccinic acid and is commonly expressed as FeIDS.
(Official 2003)

Fe-6 — Iron (II) Sulfate (ferrous sulfate), and its hydrated forms

Is an iron (II) salt of sulfuric acid. Anhydrous iron (II) sulfate has the formula of FeSO₄.
(Official 2000)

Fe-2 — Iron (III) Chloride (ferric chloride, iron chloride), and its hydrated forms 

Is an iron salt of hydrochloric acid. Anhydrous iron (III) chloride has the formula of FeCl₃.
(Official 2000)

Fe-3 — Iron (III) Nitrate (ferric nitrate, iron nitrate)

Is an iron (III) salt of nitric acid with the formula of Fe(NO₃)₃.
(Official 2000)

Fe-4 — Iron (III) Oxide (ferric oxide, red iron oxide) 

Is an iron (III) oxide of iron with the formula of Fe₂O₃.
(Official 2000)

Fe-7 — Iron (III) Sulfate (ferric sulfate), and its hydrated forms

Is an iron (III) salt of sulfuric acid. Anhydrous iron (III) sulfate has the formula of Fe₂(SO₄)₃.
(Official 2000)

Fe-15 — Iron Amino Acid Complex

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

Fe-9 — Iron Citrate 

Is an iron (III) chelate of citric acid, and is commonly expressed as Fe citrate.
(Official 2000)

Fe-11 — Iron DTPA

Is an iron (III) chelate of diethylenetriaminepentaacetic acid, and is commonly expressed as FeDTPA.
(Official 2000)

Fe-13 — Iron EDDHA

Is an iron (III) chelate of ethylenediamine-N,N-bis (2-hydroxyphenyl acetic acid), and is commonly expressed as FeEDDHA.
(Official 2000, Tentative WA 2022, Official SA 2022)

Fe-24 — Iron EDDHSA

Is an iron (III) chelate of ethylenediamine di-(2-hydroxy-5-sulfophenylacetic) acid and is commonly expressed as FeEDDHSA.
(Tentative 2016, WA, Official 2016, SA)

Fe-10 — Iron EDTA 

Is an iron (III) chelate of ethylenediaminetetraacetic acid, and is commonly expressed as FeEDTA.
(Official 2000)

Fe-8 — Iron Frits 

Are iron sources incorporated into a glassy matrix which provide a type of controlled release, depending on the particle size and composition.
(Official 2000)

Fe-14 — Iron Glucoheptonate 

Is an iron (III) complex of glucoheptonic acid, and is commonly expressed as Fe glucoheptonate.
(Tentative WA 2020, Official WA 2022)

Fe-25 — Iron (II) Gluconate

Is an iron (II) complex of gluconic acid, and is commonly expressed as Fe gluconate.
(Tentative WA 2020, Official WA 2022)

Fe-26 — Iron HBED

Is an iron (III) chelate of bis(2-hydroxybenzyl)ethylenediamine diacetic acid, and is commonly expressed as FeHBED.
(Tentative WA 2017, Official SA 2017)

Fe-12 — Iron HEDTA

Is an iron (III) chelate of hydroxyethylethylenediaminetriacetic acid, and is commonly expressed as FeHEDTA.
(Official 2000)

Fe-16 — Iron Humate

Is an organic complex of iron (II) with a humic acid product, and is commonly expressed as Fe humate.
(Official 2000)

Fe-17 — Iron Lignosulfonate 

Is a complex of the iron (II) salt and lignosulfonic acid.
(Tentative SA 2018, Official 2019)

Fe-23 — Iron EAHP

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

Fe-5 — Iron Oxysulfate 

Is a mixture of variable proportions of iron (III) oxide and iron (III) sulfate resulting from the partial acidulation of iron oxide with sulfuric acid.
(Official 2000)

Fe-22 — Iron Polysaccharide 

Is an organic compound of iron with polysaccharide long chain carbohydrates.
(Official 2006)

Fe-18 — Iron Sucrate

Is an organic complex of iron (II) with a short chain (monosaccharide or disaccharide) aldehyde-type reducing sugar.
(Official 2000)

Fe-21 — Magnetic Rock

Is a natural rock containing iron materials of sufficient purity and quantity to permit its use as an iron source. The principal iron compound is magnetite, Fe₃O₄.
(Official 2005)

 

Manganese (Mn)

 

Mn-1 — Manganese (II) Carbonate (manganese carbonate, manganous carbonate)

Is a manganese (II) salt of carbonic acid with the formula of MnCO₃.
(Official 2000)

Mn-2 — Manganese (II) Chloride (manganous chloride, manganese chloride), and its hydrated forms

Is a manganese (II) salt of hydrochloric acid. Anhydrous manganese (II) chloride has the formula of MnCl₂.
(Official 2000)

Mn-16 — Manganese (II) IDS

Is a manganese (II) chelate of iminodisuccinic acid and is commonly expressed as MnIDS.
(Official 2003)

Mn-3 — Manganese (II) Nitrate (manganese nitrate, manganous nitrate)

Is a manganese salt of nitric acid with the formula of Mn(NO₃)₂.
(Official 2000)

Mn-4 — Manganese (II) Oxide (manganous oxide)

Is an oxide of manganese with the formula of MnO.
(Official 2000)

Mn-7 — Manganese (II) Sulfate (manganous sulfate, manganese sulfate), and its hydrated forms

Is a manganese (II) salt of sulfuric acid. Anhydrous manganese (II) sulfate has the formula of MnSO₄.
(Official 2000)

Mn-5 — Manganese (IV) Oxide (manganese oxide)

Is an oxide of manganese with the formula of MnO₂.
(Official 2000)

Mn-19 — Manganese (II) Thiosulfate

Is a product composed principally of MnS₂O₃. It is most commonly available in aqueous solution.
(Official 2010)

Mn-12 — Manganese Amino Acid Complex

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

Mn-9 — Manganese Citrate

Is a manganese chelate of citric acid, and is commonly expressed as Mn citrate.
(Official 2000)

Mn-10 — Manganese EDTA

Is a manganese (II) chelate of ethylenediaminetetraacetic acid, and is commonly expressed as MnEDTA.
(Official 2000)

Mn-8 — Manganese Frits

Are manganese sources incorporated into a glassy matrix which provide a type of controlled release, depending on the particle size and composition.
(Official 2000)

Mn-11 — Manganese Glucoheptonate

Is a manganese (II) complex of glucoheptonic acid, and is commonly expressed as Mn glucoheptonate.
(Tentative WA 2020, Official WA 2022)

Mn-20 — Manganese (II) Gluconate

Is a manganese (II) complex of gluconic acid, and is commonly expressed as Mn gluconate.
(Tentative WA 2019, Official SA 2019)

Mn-13 — Manganese Humate

Is an organic complex of manganese (II) with a humic acid product, and is commonly expressed as Mn humate.
(Official 2000)

Mn-14 — Manganese Lignosulfonate

Is a complex of the manganese (II) salt of lignosulfonic acid.
(Tentative SA 2018, Official WA 2019)

Mn-18 — Manganese EAHP

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

Mn-21 — Manganese EDDHA

Is a manganese (II) chelate of ethylenediamine-N,N-bis (2-hydroxyphenyl acetic acid), and is expressed as MnEDDHA.
(Tentative WA 2022, Official SA 2022)

Mn-6 — Manganese Oxysulfate

Is a mixture of variable proportions of manganese (II) oxide and manganese (II) sulfate resulting from the partial acidulation of manganese (II) oxide with sulfuric acid.
(Official 2000)

Mn-17 — Manganese Polysaccharide

Is an organic compound of manganese with polysaccharide long chain carbohydrates.
(Official 2006)

Mn-15 — Manganese Sucrate

Is an organic complex of manganese (II) with a short chain (monosaccharide or disaccharide) aldehyde-type reducing sugar.
(Official 2000)

 

Molybdenum (Mo)

 

Mo-1 — Ammonium Molybdate, and its hydrated forms

Is an ammonium salt of molybdic acid. Anhydrous ammonium molybdate has the formula of (NH₄)₆Mo₇O₂₄.
(Official 2000)

Mo-2 — Molybdic Oxide

Is an oxide of molybdenum with the formula of MoO₃.
(Official 2000)

Mo-3 — Sodium Molybdate, and its hydrated forms

Is a sodium salt of molybdic acid. Anhydrous sodium molybdate has the formula of Na₂MoO₄.
(Official 2000)

 

Zinc (Zn)

 

Zn-15 — Zinc Amino Acid Complex

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

Zn-1 — Zinc Carbonate

Is a zinc salt of carbonic acid with the formula of ZnCO₃.
(Official 2000)

Zn-2 — Zinc Chloride, and its hydrated forms

Is a zinc salt of hydrochloric acid. Anhydrous zinc chloride has the formula of ZnCl₂.
(Official 2000)

Zn-11 — Zinc Citrate

Is a zinc chelate of citric acid, and is commonly expressed as Zn citrate.
(Official 2000)

Zn-23 — Zinc EDDHA

Is a zinc (II) chelate of ethylenediamine-N,N-bis (2-hydroxyphenyl acetic acid), and is expressed as ZnEDDHA.
(Tentative WA 2022, Official SA 2022)

Zn-12 — Zinc EDTA

Is a zinc chelate of ethylenediaminetetraacetic acid, and is commonly expressed as ZnEDTA.
(Official 2000)

Zn-4 — Zinc Ferrite

Is a mixture of zinc and iron oxides commonly expressed by the formula of ZnFe₂O₄ or by the formula of ZnO·Fe₂O₃.
(Official 2000)

Zn-9 — Zinc Frits

Are zinc sources incorporated into a glassy matrix which provide a type of controlled release, depending on the particle size and composition.
(Official 2000)

Zn-13 — Zinc Glucoheptonate

Is a zinc (II) complex of glucoheptonic acid, and is commonly expressed as Zn glucoheptonate.
(Tentative WA 2020, Official WA 2022)

Zn-22 — Zinc (II) Gluconate

Is a zinc (II) complex of gluconic acid, and is commonly expressed as Zn gluconate.
(Tentative WA 2020, Official WA 2022)

Zn-16 — Zinc Humate

Is an organic complex of zinc (II) with a humic acid product, and is commonly expressed as Zn humate.
(Official 2000)

Zn-19 — Zinc IDS

Is a zinc chelate of iminodisuccinic acid and is commonly expressed as ZnIDS.
(Official 2003)

Zn-17 — Zinc Lignosulfonate

Is a complex of the zinc (II) salt of lignosulfonic acid.
(Tentative SA 2018, Official WA 2019)

Zn-21 — Zinc EAHP

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

Zn-5 — Zinc Nitrate

Is a zinc salt of nitric acid with the formula of Zn(NO₃)₂.
(Official 2000)

Zn-14 — Zinc NTA

Is a zinc chelate of nitrilotriacetic acid, and is commonly expressed as ZnNTA.
(Official 2000)

Zn-6 — Zinc Oxide

Is an oxide of zinc with the formula of ZnO.
(Official 2000)

Zn-7 — Zinc Oxysulfate

Is a mixture of variable proportions of zinc oxide and zinc sulfate resulting from the partial acidulation of zinc oxide with sulfuric acid. 
(Official 2000)

Zn-20 — Zinc Polysaccharide

Is an organic compound of zinc with polysaccharide long chain carbohydrates.
(Official 2006)

Zn-18 — Zinc Sucrate

Is an organic complex of zinc (II) with a short chain (monosaccharide or disaccharide) aldehyde-type reducing sugar.
(Official 2000)

Zn-8 — Zinc Sulfate, and its hydrated forms 

Is a zinc salt of sulfuric acid. Anhydrous zinc sulfate has the formula of ZnSO₄.
(Official 2000)

Zn-10 — Zinc-Ammonia Complex (zinc ammonia complex) 

Is an inorganic complex of ammonia with zinc sulfate or zinc chloride in an aqueous solution.
(Official 2000)