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| $ per ton of material | ||
|---|---|---|
| Material or grade | 1964 | 1988 |
| Anhydrous ammonia | $122.00 |
$191.00 |
| Urea | 104.00 |
188.00 |
| 28% N solution | -- |
123.00 |
| Ammonium nitrate | 78.70 |
170.00 |
| 18-46-0 | 109.00 |
216.00 |
| 0-46-0 | 77.50 |
221.00 |
| 0-0-60 | 53.30 |
157.00 |
| Limestone* | 4.75 |
16.20 |
* spread on field.