Table 1: Conversion coefficients between nutrient forms
|
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 |
1.01 |
|
K |
K2O |
1.20 |
K20 |
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 |
Table 2: Conversion coefficients between nutrient concentration expressions
|
From |
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- |
|
H2PO4 |
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 |
SO42 |
32 mg S |
48 mg SO4 |
|
SO4 2 |
16 mg S |
Na+ |
23 mg Na |
- |
|
Na+ |
23 mg Na |
CI |
35.5 mg Cl |
- |
Table 3: Conversion coefficients between agronomic units
|
From |
To |
Multiply by |
From |
To |
Multiply by |
|
Acre |
Hectare |
0.405 |
Hectare |
Acre |
2.471 |
|
Kilogram |
Pound |
2.205 |
Pound |
Kilogram |
0.453 |
|
Gram |
Ounce |
0.035 |
Ounce |
Gram |
28.35 |
|
Short ton |
Metric ton |
0.907 |
Metric ton |
Short ton |
1.1 |
|
Gallon (US) |
Liter |
3.785 |
Liter |
Gallon (US) |
0.26 |
|
kg / ha |
lb / acre |
0.892 |
lb / acre |
kg / ha |
1.12 |
|
MT / ha |
lb / acre |
892 |
lb / acre |
MT / ha |
0.001 |

