Comparison of Fresh and Rotten Manure (Wolff).
| Fresh. | Moderately rotten | |
| (Taking the quantity of dry matter as the same.) | ||
| Dry matter | 25.00 | 25.00 |
| Ash | 3.81 | 4.76 |
| Nitrogen | 0.39 | 0.49 |
| Potash | 0.45 | 0.56 |
| Lime | 0.49 | 0.61 |
| Magnesia | 0.12 | 0.15 |
| Phosphoric acid | 0.18 | 0.23 |
| Sulphuric acid | 0.10 | 0.13 |
| Silica | 0.86 | 1.08 |
Lord Kinnaird's Experiments.[182]
"Lord Kinnaird has given the particulars of a very careful experiment. He tried to test the comparative value of manure kept in an open court with that kept under cover. He selected the same kind of cattle, gave them the same kind and quantity of food, and bedded them with the same kind of straw. A field of 20 acres of uniform land was selected. This having been equally divided, 2 acres out of each 10 gave the following results:—
Potatoes grown with Uncovered Manure.
| Tons. | cwt. | lb. | |
| First measurement—1 acre produced | 7 | 6 | 8 |
| Second measurement—1 acre produced | 7 | 18 | 99 |
Potatoes grown with Covered Manure.
| Tons. | cwt. | lb. | |
| First measurement—1 acre produced | 11 | 17 | 56 |
| Second measurement—1 acre produced | 11 | 12 | 26 |
This shows an increase of about 4 tons of potatoes per acre with the covered manure.