NOTE XVI. (p. 270).
Amounts of Potash and Phosphoric Acid removed by the following Rotations from a Prussian Morgen (.631 Acre).
NOTE XVII. (pp. 253, 254).
Composition of Farmyard Manure (Fresh), (calculated by Sir John Lawes).
| Phosphoric acid | |||||
| Total | Total | calculated as | |||
| dry | mineral | phosphate of | |||
| matter. | matter. | lime. | Potash. | Nitrogen. | |
| Percent | 30.0 | 2.77 | .50 | .53 | .64 |
| Per ton (in lb.) | 67.2 | 62.0 | 11.1 | 12.0 | 14.3 |
NOTE XVIII. (p. 232).
The Urine.
An important consideration we have omitted to take note of in the text is the quantity of the urine voided. It is this consideration that renders the urine so much more valuable than the solid excreta. In the case of a man it has been estimated that the urine voided is fifteen times as much, is twelve times as rich in nitrogen, three times in potash, and two in phosphoric acid, as the solid excreta (Munro). The relation of solid matter in the case of the farm animals is not exactly similar. The urine of the ox is about twice the weight of its solid excreta. Both the horse and the sheep, however, void as a rule more solid excreta than urine. Munro, in his work on 'Soils and Manures,' contrasts the composition of the urine and solid excreta of the different farm animals by the following statement:—
| 1 ton of urine contains in lb.: | 1 ton of solid excreta contains in lb.: | ||
| Nitrogen. | Potash. | Nitrogen. | |
| Cow | 30 | 20 | 9 |
| Horse | 36 | 22 | 12 |
| Sheep | 38 | 30 | 16 |