| Wheat. | ||||||
| After | After | Bokhara | White | |||
| fallow, | clover, | clover, | Vetches, | Lucern, | clover, | |
| Depth. | 1883. | 1883. | 1882. | 1883. | 1885. | 1885. |
| lb. | lb. | lb. | lb. | lb. | lb. | |
| 1st 9 inches | 3.4 | 6.1 | 3.4 | 10.2 | 8.9 | 11.5 |
| 2d 9 inches | 3.1 | 4.4 | 1.0 | 2.7 | 1.1 | 1.4 |
| 3d 9 inches | 0.8 | 1.6 | 0.6 | 1.1 | 0.8 | 0.9 |
| 4th 9 inches | 1.0 | 1.3 | 1.0 | 1.5 | 0.8 | 1.9 |
| 5th 9 inches | 0.8 | 1.5 | 0.8 | 2.5 | 1.0 | 7.1 |
| 6th 9 inches | 0.6 | 0.8 | 1.7 | 4.4 | 0.9 | 11.3 |
| 7th 9 inches | 0.8 | 2.2 | — | 4.5 | 0.6 | 13.1 |
| 8th 9 inches | 0.9 | 1.7 | — | 4.9 | 0.8 | 12.6 |
| 9th 9 inches | 0.7 | 2.4 | — | 4.8 | 0.7 | 11.2 |
| 10th 9 inches | 2.0 | 2.1 | — | 5.1 | 0.6 | 10.7 |
| 11th 9 inches | 1.5 | 2.1 | — | 6.4 | 0.4 | 11.1 |
| 12th 9 inches | 3.8 | 2.8 | — | 6.5 | 0.4 | 10.0 |
NOTE IV. (p. 124 and p. 131).
Nitrogen as Nitrates in Wheat-soils variously manured, October 1881, in Lb. per Acre (Rothamsted Soils).
| Excess | ||||||
| Total | over | |||||
| 1st 9 | 2nd 9 | 3rd 9 | 27 | plots | ||
| Plot. | Manuring. | inches. | inches. | inches. | inches. | 3 and 4. |
| lb. | lb. | lb. | lb. | lb. | ||
| 3 | No manure, 38 years | 9.7 | 5.3 | 2.8 | 17.8 | — |
| 4 | No manure, 30 years | 9.2 | 4.0 | 1.8 | 15.0 | — |
| 16a | No manure, 17 years | 10.6 | 5.0 | 2.3 | 17.9 | 1.5 |
| 5a | Ash constituents, 30 years | 12.6 | 7.1 | 4.6 | 24.3 | 7.9 |
| 17a | Ash constituents, 1 year | 10.3 | 7.5 | 3.4 | 21.2 | 4.8 |
| 6a | Ash and ammonium salts, 200 lb. | 16.5 | 7.5 | 4.7 | 28.7 | 12.3 |
| 7a | Ash and ammonium salts, 400 lb. | 22.8 | 11.3 | 5.7 | 39.8 | 23.4 |
| 8a | Ash and ammonium salts, 600 lb. | 21.1 | 13.9 | 7.8 | 42.8 | 26.4 |
| 9a | Ash and sodium nitrate, 550 lb. | 19.7 | 10.0 | 8.2 | 37.9 | 21.5 |
| 9b | Sodium nitrate, 550 lb. | 16.3 | 20.1 | 17.7 | 54.1 | 37.7 |
| 10a | Ammonium salts, 400 lb. | 14.2 | 11.9 | 7.3 | 33.4 | 17.0 |
| 11a | Superphosphate and ammonium salts, 400 lb. | 17.9 | 9.3 | 3.6 | 30.8 | 14.4 |
| 19 | Rape-cake, 1700 lb. | 14.1 | 13.0 | 7.1 | 34.2 | 17.8 |
| 2 | Farmyard manure, 14 tons—38years | 30.0 | 15.4 | 6.8 | 52.2 | 35.8 |
Nitrogen as Nitrates in Barley-soils variously manured, March 1892, in Lb. per Acre (Rothamsted Soils).
| Excess | ||||||
| Total | over | |||||
| 1st 9 | 2d 9 | 3d 9 | 27 | plot | ||
| Plot. | Manuring. | inches. | inches. | inches. | inches. | 10 |
| lb. | lb. | lb. | lb. | lb. | ||
| 10 | No manure | 5.9 | 4.7 | 5.1 | 15.1 | — |
| 20-40 | Ash constituents (mean) | 6.7 | 7.0 | 6.4 | 20.1 | 4.4 |
| 1A | Ammonium salts, 200 lb. | 6.1 | 8.3 | 7.0 | 21.4 | 5.7 |
| 2A-4A | Ammonium and ash constituents (mean) | 7.7 | 7.8 | 7.6 | 23.1 | 7.4 |
| 1AA | Sodium nitrate, 275 lb. | 9.7 | 6.8 | 9.0 | 25.5 | 9.8 |
| 2AA-4AA | Sodium nitrate and ash constituents (mean) | 8.3 | 7.4 | 7.5 | 23.2 | 7.5 |
| 1C | Rape-cake, 1000 lb. | 10.6 | 13.7 | 7.9 | 32.2 | 16.5 |
| 2C-4C | Rape-cake and ash constituents (mean) | 8.8 | 11.9 | 8.7 | 29.4 | 13.7 |
| 7-1 | No manure, 10 years—formerly dung | 14.8 | 11.8 | 10.9 | 37.5 | 21.8 |
| 7-2 | Farmyard manure, 14 tons | 18.6 | 14.6 | 10.9 | 44.1 | 28.4 |
NOTE V. (p. 134).
Examples of Increase of Nitrogen in Rothamsted Soils laid down in Pasture.
| Age of | Nitrogen in | |
| pasture. | 1st 9 inches. | |
| Years. | Per cent. | |
| Arable land | — | 0.140 |
| Barn-field pasture | 8 | 0.151 |
| Apple-tree pasture | 18 | 0.174 |
| Dr Gilbert's meadow | 21 | 0.204 |
| Dr Gilbert's meadow | 30 | 0.241 |
NOTE VI. (p. 141).