| 35-7/8 | 33-1/2 | 34-7/8 |
Unmanured continuously | 14-1/2 | 11-1/2 | 13 |
Mixed mineral manures[1] and 3-1/2 | | | |
cwt. superphosphate | 17 | 12-7/8 | 15 |
Mixed mineral manures, 3-1/2 cwt. | | | |
superphosphate, 200 lb. ammonium | | | |
salts | 26-1/2 | 21-3/4 | 24-1/8 |
Mixed mineral manures and 3-1/2 cwt. | | | |
superphosphate, 600 lb. ammonium | | | |
salts | 38-1/4 | 34-3/4 | 36-1/2 |
Mixed mineral manures, 3-1/2 cwt. | | | |
superphosphate, 275 lb. nitrate | | | |
of soda | 36-7/8 | 34 | 35-3/8 |
275 lb. nitrate of soda | 26 | 19-3/8 | 22-3/4 |
400 lb. ammonium salts every year | | | |
since 1845 | 22-1/2 | 19 | 22-1/2 |
400 lb. ammonium salts, 3-1/2 cwt. | | | |
superphosphate | 28 | 22-1/4 | 25-1/8 |
Mineral manure, 3-1/2 cwt. | | | |
superphosphate, 400 lb. ammonium | | | |
salts in autumn | 31-5/8 | 29-1/2 | 30-1/2 |
-------------------------------------+------------+------------+------------+
----------------------------------------------------------------------------+
| PRODUCE PER ACRE--AVERAGE PER ANNUM. |
+--------------------------------------+
| Dressed grain. |
MANURES PER ACRE PER ANNUM. +--------------------------------------+
| Quantity. |
+------------+------------+------------+
| 20 years, | 20 years, | 40 years |
| 1852-71. | 1872-91. | 1852-91. |
-------------------------------------+------------+------------+------------+