rs, | 20 years, | 40 years, |
| 1852-71. | 1872-91. | 1852-91. |
-------------------------------------+------------+------------+------------+
| bush. | bush. | bush. |
Unmanured continuously | 20 | 13-1/4 | 16-1/2 |
3-1/2 cwt. superphosphate of lime | 25-1/2 | 17-3/4 | 21-3/4 |
Mixed mineral manures | 22-1/2 | 13-1/2 | 18 |
Mixed mineral manures, 3-1/2 cwt. | | | |
superphosphate | 27-1/2 | 17-1/4 | 22-3/8 |
200 lb. ammonium salts | 32-1/2 | 25-5/8 | 29 |
200 lb. ammonium salts, 3-1/2 cwt. | | | |
superphosphate | 47 | 38-1/2 | 42-3/4 |
200 lb. ammonium salts, | | | |
mixed mineral manures | 35 | 27-3/4 | 31-3/8 |
Manures, 3-1/2 cwt. | | | |
superphosphate of lime | 46-1/4 | 40-3/4 | 43-1/2 |
275 lb. nitrate of soda | 37 | 28-3/8 | 32-3/4 |
275 lb. nitrate of soda, 3-1/2 cwt. | | | |
superphosphate | 49-1/4 | 42-1/4 | 45-3/4 |
275 lb. nitrate of soda, | | | |
mixed mineral manures. | 37-3/8 | 29-1/2 | 33-1/2 |
275 lb. nitrate of soda, | | | |
mixed mineral manures, | | | |
3-1/2 cwt. superphosphate | 49-3/4 | 41-1/4 | 45-1/2 |
1000 lb. rape-cake | 45-1/4 | 37-1/8 | 41-1/4 |
1000 lb. rape-cake, 3-1/2 cwt. | | | |
superphosphate | 46-3/4 | 40 | 43-3/8 |
1000 lb. rape-cake, | | | |
mixed mineral manures | 43-5/8 | 35-5/8 | 39-1/2 |
1000 lb. rape-cake, | | | |
mixed mineral manures, and | | | |
3-1/2 cwt. superphosphate | 47-3/8 | 39 | 43-1/4 |
Farmyard manure, 1