General resource for Crop Guides: Units Conversion Tables

From	To	Multiply by	From	To	Multiply by
P	P₂O₅	2.29	P₂O₅	P	0.44
P	PO₄	3.06	PO₄	P	0.32
H₃PO₄	H₂PO₄	0.9898	H₂PO₄	H₃PO₄	1.38
K	K₂O	1.20	K₂O	K	0.83
Ca	CaO	1.40	CaO	Ca	0.71
Mg	MgO	1.66	MgO	Mg	0.60
S	SO₃	2.50	SO₃	S	0.40
S	SO₄	3.00	SO₄	S	0.33
N	NH₄	1.28	NH₄	N	0.82
N	NO₃	4.43	NO₃	N	0.22

From	To	Multiply by	From	To	Multiply by
Acre	Hectare	0.405	Hectare	Acre	2.471
Kilogram	Lbs	2.205	Lbs	Kilogram	0.453
Gram	Ounces	0.035	Ounces	Gram	28.35
Short Ton	MT	0.907	MT	Short Ton	1.1
Gallon (US)	Liters	3.785	Liters	Gallon (US)	0.26
Kg/Ha	Lbs/acre	0.892	Lbs/acre	Kg/Ha	1.12
MT/Ha	Lbs/acre	892	Lbs/acre	MT/Ha	0.001

1 meq	Correspondent element (mg)	1 mmol	Correspondent element (mg)	Weight of ion
NH₄ ⁺	14 mg N	NH₄⁺	14 mg N	18 mg NH₄⁺
NO₃^-	14 mg N	NO₃ ^-	14 mg N	62 mg NO₃^-
H₂PO^4-	31 mg P	H₂PO4 -	31 mg P	71 mg P₂O₅
HPO₄ ^2-	31 mg P	HPO₄ ^2-	31 mg P	35,5 mg P₂O₅
HPO₄ ^2-	15.5 mg P	K⁺	39 mg K	47 mg K₂O
K⁺	39 mg K	Ca²⁺	40 mg Ca	28 mg CaO
Ca²⁺	20 mg Ca	Mg²⁺	24 mg Mg	20 mg MgO
Mg²⁺	12 mg Mg	SO₄^2-	32 mg S	48 mg SO₄
SO₄ ^2-	16 mg S	Na⁺	23 mg Na	-
Na⁺	23 mg Na	Cl^-	35.5 mg Cl	-