ACES Publications

Author: Charles Mitchell
PubID: ANR-0174
Title: Nutrient Content of Fertilizer Materials
Pages: 4     Balance: 0
ANR-0174 Nutrient Content of Fertilizer Materials

Nutrient Content of Fertilizer Materials


The following tables can be used as quick reference guides to fertilizer materials. These materials may be used alone or blended with other fertilizer materials to form a multinutrient fertilizer.

The actual nutrient content may vary from what is listed, depending upon the manufacturer, the purity of the product, or other materials blended with the product. Most values are for the fertilizer-grade product and not the pure chemical. The chemical formulas given are for the primary active compound.

Primary and Secondary Nutrient Sources


Material Percentage
Approx. CaCO3
Equiv./100 lb.
Comments
P2O5 K2O Ca Mg S

Nitrogen Materials

Ammonium nitrate‡
  NH4NO3
34 0 0 0 0 0 -61  

Ammonium nitrate limestone
  NH4NO3 + (CaCO3 + MgCO3)
20 0 0 6 4 0 0 Ca and Mg depend on limestone used

Ammonium nitrate sulfate
  NH4NO3 + (NH4)2SO4
30 0 0 0 0 5 -71  

Ammonium sulfate‡
  (NH4)2SO4
21 0 0 0 0 24 -110  

Anhydrous ammonia‡
  NH3
82 0 0 0 0 0 -148 Pressurized gas

Aqua ammonia
  NH4OH
16-25 0 0 0 0 0 -36 to -54  

Calcium cyanamide
  CaCN2
21 0 0 11 0 0 +63 Most alkaline N material

Calcium nitrate
  Ca(NO3)24H2O
15 0 0 21 0 0 +20  

Calcium nitrate/urea (Calurea)
  Ca(NO3)2 + 4CO(NH2)2
34 0 0 10 0 0 -36 Don't blend with superphosphate

Crotonylidene diurea
  (CDU)
32 0 0 0 0 0 NA Slow-release

Isobutylidene diurea
  (IBDU)
31 0 0 0 0 0 NA Slow-release

Nitrogen solutions (N-SOL or UAN solutions)‡
(urea/ammonium nitrate):
  32% UAN (35% urea + 45% A.N.)
  30% UAN (33% urea + 42% A.N.)
  28% UAN (30% urea + 40% A.N.)
  21% AN (60% A.N. + 40% water)
  19% AN (54% A.N. + 46% water)
32
30
28
21
19
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-55
-52
-49
-37
-33
Solutions code:
320(0-45-35)
300(0-42-33)
280(0-40-30)
210(0-60-0)
190(0-54-0)

Potassium nitrate
  KNO3
13 0 44 0 0 0 +26  

Sodium nitrate (nitrate of soda)
  NaNO3
16 0 0 0 0 0 +29  

Urea‡
  CO(NH2)2
45 0 0 0 0 0 -81  

Urea (sulfur coated)
  CO(NH2)2 + S
36-38 0 0 0 0 13-16 -118 N release depends on S coating

Ureaform
  (urea + formaldehyde)
38 0 0 0 0 0 -68 Slow-release

Phosphorous Materials

Ammoniated superphosphate 12-17 22-35 0 * 0 * -7  

Ammonium phosphate‡
  Diammonium phosphate (DAP)
  (NH4)2H2PO4
  Monoammonium phosphate (MAP)
  NH4HPO4
18

11
46

48
0

0
0

1
0

0
0

0
-70

-65
 

Ammonium phosphate nitrate
  NH4H2PO4.NH4NO3
30 10 0 0 0 0 -54  

Ammonium phosphate sulfate
  4NH4H2PO4. x (NH4)2SO4
16 20 0 0 0 15 -76 to -113 Mixture

Ammonium polyphosphate‡
  (NH4)HP2O7 + (NH4)5P3O10
10 34 0 0 0 0 Liquid

Basic Slag 0 0-6 * 3-29 * * +70 Analysis variable

Bone meal (steamed)
  Ca3(PO4)2 + CaCO3
0-2 10-20 0 19-25 0 0 +20  

Concentrated superphosphate‡
  (triple superphosphate)
  Ca(H2PO4)2. x H2O
0 46 0 14 0 2 0  

Nitric phosphate 12-17 22-35 0 * 0 * -20  

Normal superphosphate
  Ca(H2PO4)2. x H2O + CaSO4
0 20 0 21 0 11 0  

Phosphate rock 0 2-35 0 * * 0 +10 Total P2O5 relatively unavailable

Phosphoric acid‡
  H3PO4
  Wet-process acid
  Concentrated wet-process acid
  Superphosphoric acid
0
0
0
30
40-54
76
0
0
0
0
0
0
0
0
0
0
0
0
-63
-84 to -110
-110
Liquid

Urea-ammonium phosphate 23 35 0 0 0 0   Research mixture

Urea phosphate
  CO(NH2)2 + H3PO4
17 44 0 0 0 0 -82 Research

Potassium Materials

Greensand 0 1 6 0 0 0   Natural low-grade, mineral

Potassium carbonate
  K2CO3 solid
  K2CO3 liquid
0
0
0
0
48
34
0
0
0
0
0
0
+70
+50
 

Potassium chloride‡
  KCl(muriate of potash)
0 0 60 0 0 0 0 Most widely used, single fertilizer material

Potassium magnesium sulfate‡
  (sulfate of potash magnesia)
  K2SO4.2MgSO4 or
  MgSO4.K2SO4.6H2O
0 0 21 0 11 23 0  

Potassium metaphosphate
  KPO3
0 59 39 0 0 0 *  

Potassium nitrate (nitrate of potash)
  KNO3
13 0 44 0 0 0 +26  

Potassium sulfate (sulfate of potash)
  K2SO4
0 0 52 0 0 16 0  

Calcium Materials

Calcium chloride
  CaCl2
0 0 0 36 0 0 0 Water soluble

Burned lime
  CaO
0 0 0 70 0 0 +178  

Calcitic limestone‡ (ground)
  CaCO3
0 0 0 36 0 0 +95 to 100  

Dolomitic limestone** (ground)
  CaCO3 + MgCO3
0 0 0 24-30 6-12 0 +95 to 108  

Selma chalk 0 0 0 32 0 0 +80  

Gypsum‡
  CaSO4. 2H2O
0 0 0 22 0 18 0 Solubility = 0.02 lb./gal.

Hydrated lime
  Ca(OH)2
0 0 0 50 0 0 +134 Solubility = 0.01 lb./gal.

Magnesium Materials

Dolomitic limestone‡ (ground)
  CaCO3 + MgCO3
0 0 0 24-30 6-12 0 +95 to 108 Analysis variable; must contain at least 6% Mg

Magnesium ammonium phosphate
  MgNH4PO4.6H2O
8 40 0 0 15 0   Solubility = 0.001 lb./gal.

Magnesium oxide
  MgO
0 0 0 0 45 0 +250 Solubility = 0.00062g/100g
0.001 oz./gal.

Magnesium sulfate‡ (epsom salt)
  MgSO4.7H2O
0 0 0 0 10 13 0 Solubility = 7.6 lb./gal.

Magnesium sulfate (Kieserite)
  MgSO4.H2O
0 0 0 0 17 23 0 Solubility = 4.7 lb./gal.

Potassium magnesium sulfate‡
  (sulfate of potash magnesia)
  K2SO4.2MgSO4
0 0 21 0 11 23 0 Soluble

Sulfur Materials

Ammonium sulfate‡
  (NH4)2SO4
21 0 0 0 0 24 -110 Available in prilled or water-soluble crystals

Ammonium thiosulfate‡ (60% solution)
  (NH4)2S2O3
12 0 0 0 0 26   Liquid; reacts with alkaline materials

Elemental sulfur (S):
  Wettable S
  Flowable S
  Flowers of S
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
90-100
52-70
90-100
-312
-218
-312
Elemental S must be oxidized to sulfate before available to plants

Gypsum‡
  CaSO4.2H2O
0 0 0 22 0 18 0  

Magnesium sulfate (epsom salt)
  MgSO4.7H2O
0 0 0 0 10 13 0 Soluble

Potassium magnesium sulfate‡ 0 0 21 0 11 23 0  

Potassium sulfate
  K2SO4
0 0 52 0 0 16 0 Soluble

Sulfuric acid
  H2SO4
0 0 0 0 0 20-26 -62 to -81 Liquid; highly reactive

†Negative value indicates net acidifying effect on soil; positive value indicates net basic reaction in soil.
‡Commonly available materials
* Present in undetermined amounts
Symbol Key: N = Nitrogen; P2O5 = Phosphate; K2O = Potash; Ca = Calcium; Mg = Magnesium; S = Sulfur; CaCO3 = Calcitic Limestone

Micronutrient Materials


Materials Nutrient Content

Copper (Cu)

Chelated Cu*:
  Cu EDTA
  Cu HEDTA
13% Cu
9% Cu

Cupric ammonium phosphate
  Cu(NH4)PO4.H2O
30% Cu

Cupric Oxide (CuO) 60-80% Cu

Copper sulfate*:
  CuSO4.H2O
  CuSO4.5H2O
  CuSO4.3Cu(OH)2
35% Cu
25% Cu
13-53% Cu

Copper frits 40-50% Cu

Copper polyflavonoid 6% Cu

Boron (B)

Borax (sodium tetraborate decahydrate)
  Na2B4O7.10H2O
11% B

Boric acid (H3BO3) 17% B

Boron frit/sodium borosilicate 6% B 

Calcium borate (colemanite)
  Ca2B6O115H2O
10% B

Fertilizer borate* (sodium tetraborate)
  Borate Granular (Na2B4O7.5H2O)
  Borate 48
14% B
15% B
48 refers to percentage B2O3

Solubor*
  Na2B4O7
20% B
66% B2O3

Magnesium borate (boracite)
  2Mg3B8O15.MgCl2
21% B

Iron (Fe)

Basic slag 10-13% Fe

Ferric sulfate Fe2(SO4)3.4H2O 20% Fe

Ferrous sulfate* FeSO4.7H2O 20% Fe

Ferrous ammonium sulfate
  (NH4)2SO4.FeSO4.6H2O
14% Fe

Ferrous ammonium phosphate
  Fe(NH4)PO4.H2O
29% Fe

Ferrous oxalate FeC2O4.2H2O 30% Fe

Ferrous carbonate
  FeCO3.H2O
42% Fe

Iron chelates*:
  Fe DTPA
  Fe EDTA
  Fe EDDHA
  Fe HEDTA
10% Fe
9-12% Fe
6% Fe
5-9% Fe

Iron ligninsulfonate 5-11% Fe

Iron polyflavonoid 6-10% Fe

Iron Frits 40% Fe

Manganese (Mn)

Basic clag 1-3% Mn

Manganese frits 10-25% Mn

Manganese chloride
  MnCl2
17% Mn

Manganese carbonate
  MnCO3
31% Mn

Manganese oxide
  MnO
68-70% Mn

Manganese sulfate*
  MnSO4.4H2O
24% Mn

Manganese chelate*
  Mn EDTA
12% Mn

Manganese ammonium phosphate
  Mn(NH4)PO4.H2O
28% Mn

Manganese polyflavonoid 8% Mn

Molybdenum (Mo)

Ammonium molybdate
  (NH4)6Mo7O24.2H2O
up to 54% Mo

Sodium molybdate*
  Na2MoO4.2H2O
38-46% Mo

Molybdenum frit 30% Mo

Superphosphate trace as impurity

Zinc (Zn)

Zinc chelate*
  Na2Zn EDTA
9-14% Zn

Zinc ammonium phosphate
  Zn(NH4)PO4.H2O
34% Zn

Zinc sulfate*
  ZnSO4.H2O
22-36% Zn

Zinc sulfide ( sphalerite) 61% Zn

Zinc oxide
  ZnO
78-80% Zn

Zinc ligninsulfonate 5-12% Zn

Zinc polyflavonoid 7-10% Zn

* Commonly used materials

 

Organic Fertilizer Materials (Approximate Values)


Material N P2O5 K2O Ca Mg S Micro-
nutrients
Acidic (-)
Neutral (0)
Alkaline (+)
Comments

Blood (dried) 12-15 3 1 * * * * -  

Blood meal 15 1 1 * * * * -  

Bone meal (steamed) 0-2 10-20 0 19-25 0 0   +  

Compost (garden) Variable depending upon components and amendments

Cottonseed meal 6-7 2.5 1.5 * * * * -  

Cottonseed hull ash 0   27 * *     +  

Cotton motes
(composted gin wastes)
2 0.5 3 4 0.7 0.6 * - May contain weed seed

Fish scrap
(acidulated)
7-10 1-2 0 * * 2   - Traces of I and Hg

Fish scrap
(dried fish meal)
9 3   6 * * *    

Hay:
  Legume
  Grass
3.0
1.5
1.0
0.5
2.4
1.9
1.2
0.8
0.2
0.2
0.3
0.2
*
*
-
-
 

Manure: (dried)
  Cattle
  Horse
  Poultry
   Broiler litter
   Hen-caged layers
   Hen-litter
  Sheep
  Swine
1.5
0.4

3.0
1.5
1.8
0.6
0.6
1.5
0.2

3.0
1.3
2.8
0.3
0.4
1.2
0.3

2.0
0.5
1.4
0.2
0.1
1.1
*

1.8
6
*
*
*
0.3
*

0.4
0.4
*
*
*
*
*

0.3
0.3
*
*
*
*
*

*
*
*
*
*
-
-

+
+
+
-
-
Feedlot manure usually
contains 60-70% water

Average moisture = 20%
Average moisture = 70%
Average moisture = 37%

Peat/Muck 2.3 0.5 0.7   * *      

Sawdust (mixed soft + hard woods) 0.2 0 0.2         - High C:N ratio; needs N fert.

Seaweed (dried) 0.7 0.8 5.0 * * * * +,-  

Sewage, sludge
(dried, municipal)
5 6 0.5 3 1 1   + Depending on source, may contain heavy metals. Use only on nonfood-producing areas

Tankage 7 1.5 3-10 * * * * -,+  

Wood ashes 0 2 6 20 1   * + 70% CaCO3 equivalent

* Present in undetermined amounts.    Symbol Key: N = Nitrogen; P2O5 = Phosphorus; K2O = Potassium; Ca = Calcium; Mg = Magnesium; S = Sulfur

ANR-0174, Reprinted March 2008. Charles C. Mitchell, Extension Agronomist, Professor, Agronomy and Soils, Auburn University


For more information, contact your county Extension office. Visit http://www.aces.edu/counties or look in your telephone directory under your county's name to find contact information.


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