Sustainable Practices for Vegetable Production in the South
Dr. Mary Peet, NCSU
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Nutrient sources
|
Nitrogen |
%N |
Leaching Risk* |
Volatilization |
| Ammonium sulfate |
21 |
low |
low |
| Ammonium nitrate |
33 |
medium |
low |
|---|---|---|---|
| Ammonium phosphates |
10-18 |
low |
low |
| Urea |
46 |
low |
medium (high if surface applied) |
| Sodium nitrate |
16 |
high |
low |
| Blood meal |
13-15 |
.. |
.. |
*These risks are for N in the ammonium form. Once in the soil, ammonium is converted to nitrate and thus is leachable.
|
Phosphates |
Typical Analysis |
Range of |
| Superphosphates |
0-20-0 |
16-50 |
| Ammonium phosphate |
11-53-0 |
48-53 |
| Diammonium phosphate |
18-46-0 |
46-53 |
| Steamed bone meal |
3-30-0 |
20-30 |
| Rock phosphate |
0-30-0 |
25-30 |
|
Potassium |
Typical Analysis |
Range of |
| Potassium chloride |
0-0-60 |
48-60 |
| Potassium sulfate |
0-0-50 |
48-50 |
| Sul-Po-Mag |
0-0-21-(11Mg) |
21-30 |
| Potassium nitrate |
13-0-44 |
44 |
| Greensand |
0-0-7 |
7 |
|
Liming materials |
Neutralizing value |
Pounds to equal |
| Calcitic lime |
100 |
2000 |
| Burned lime |
178 |
1120 |
| Hydrated lime |
134 |
1490 |
| Magnesium carbonate |
119 |
1675 |
| Dolomitic limestone |
95-108 |
1850-2100 |
| Ground shells |
80-88 |
2200-2500 |
| Basic slag |
67-71 |
2800-3000 |
| Flue dust |
96 |
2100 |
| Rock phosphate |
7 |
- |
| Wood ashes |
40 |
5000 |