4. With copperas (FeSO4)—
| FeSO4 | (NH4)2CO3 | FeCO3 | (NH4)2SO4 | |||
| (Sulphate of | + | (carbonate of | = | (ferrous | + | (sulphate of |
| iron,) | ammonia,) | carbonate,) | ammonia.) |
5. With sulphate of magnesia (MgSO4)—
| MgSO4 | (NH4)2CO3 | MgCO3 | (NH4)2SO4 | |||
| (Sulphate of | + | (carbonate of | = | (carbonate of | + | (sulphate of |
| magnesia,) | ammonia,) | magnesia,) | ammonia.) |
Reference has been made to the fact that magnesium sulphate may probably not only fix the ammonia, but the phosphoric acid. When magnesium sulphate, soluble phosphoric acid, and ammonia are brought in contact with one another, the double insoluble phosphate of ammonium and magnesium (MgNH4PO46Aq) is formed. While such a reaction is possible, it is highly improbable that it takes place to any extent. The double phosphate is a crystalline salt which only separates after a considerable time, and in the presence of a large excess of ammonia.
Analyses of Cow-Manure.[181]
| 1. | 2. | 3. | 4. | 5. | 6. | Average. | |
| Water | 85.30 | 77.71 | 74.02 | 72.87 | 75.00 | 77.50 | 77.06 |
| Dry matter | 14.70 | 22.30 | 25.98 | 27.13 | 25.00 | 22.50 | 22.93 |
| Ash ingredients | 2.04 | 4.71 | 3.94 | 6.70 | 6.22 | 2.20 | 4.30 |
| Potash | 0.36 | 0.46 | 0.56 | 1.69 | 0.39 | 0.40 | 0.64 |
| Lime | 0.29 | 0.37 | 0.58 | 0.41 | 0.24 | 0.31 | 0.48 |
| Magnesia | 0.19 | 0.11 | 0.13 | — | 0.18 | 0.11 | — |
| Phosphoric acid | 0.16 | 0.13 | 0.07 | 0.20 | 0.14 | 0.16 | 0.14 |
| Ammonia | 0.06 | 0.16 | 0.07 | — | 0.27 | — | 0.14 |
| Total nitrogen | 0.38 | 0.54 | 0.41 | 0.79 | 0.46 | 0.34 | 0.48 |
NOTE XII. (p. 259).
Composition of Fresh and Rotten Farmyard Manure (Voelcker).