“A square yard of the soil from the bottom of the hill, where the clover was stronger than on the brow of the hill, produced 2 lbs. 8 oz. of fresh clover-roots; or 1 lb. 11 oz. 47 grains of partially dried roots; 61 lbs. 9 oz. of limestones, and 239.96 lbs. of nearly dry soil.
“The partially dried roots contained:
| Moisture | 5.06 |
| Organic matter* | 31.94 |
| Mineral matter | 63.00 |
| 100.00 | |
| * Containing nitrogen | .804 |
“An acre of this soil, six inches deep, produced 3 tons, 7 cwts. 65 lbs. of clover-roots, containing 61 lbs. of nitrogen; that is, there was very nearly the same quantity of roots and nitrogen in them, as that furnished in the soil from the brow of the hill.
“The roots, moreover, yielded .365 per cent of phosphoric acid; or, calculated per acre, 27 lbs.
“In the partially dried soil, I found:
| Moisture | 4.70 |
| Organic matter* | 10.87 |
| Mineral matter† | 84.43 |
| 100.00 | |
| * Containing nitrogen | .405 |
| Equal to ammonia | .491 |
| † Including phosphoric acid | .321 |
“According to these determinations, an acre of soil from the bottom of the hill, contains:
| Tons | Cwts. | Lbs. | |
| Nitrogen in the organic matter of the soil | 2 | 2 | 0 |
| Nitrogen in clover-roots of the soil | 0 | 0 | 61 |
| Total amount of nitrogen per acre | 2 | 2 | 61 |
“Compared with the amount of nitrogen in the soil from the brow of the hill, about 11 cwt. more nitrogen was obtained in the soil and roots from the bottom of the hill, where the clover was more luxuriant.