4 tons every year | 48-1/4 | 49 | 48-5/8 |
-------------------------------------+------------+------------+------------+

----------------------------------------------------------------------------+
| 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. |
-------------------------------------+------------+------------+------------+
| lb. | lb. | lb. |
Unmanured continuously | 52-3/8 | 51-3/4 | 52 |
3-1/2 cwt. superphosphate of lime | 53-1/4 | 53 | 53-1/8 |
Mixed mineral manures | 53 | 51-7/8 | 52-1/2 |
Mixed mineral manures, 3-1/2 cwt. | | | |
superphosphate | 53-3/8 | 52-3/8 | 53 |
200 lb. ammonium salts | 52-1/8 | 52 | 52 |
200 lb. ammonium salts, 3-1/2 cwt. | | | |
superphosphate | 53-3/8 | 52-1/4 | 52-7/8 |
200 lb. ammonium salts, | | | |
mixed mineral manures | 52-3/4 | 52-1/2 | 52-5/8 |
Manures, 3-1/2 cwt. | | | |
superphosphate of lime | 54 | 54-1/8 | 54 |
275 lb. nitrate of soda | 52 | 52-1/8 | 52 |
275 lb. nitrate of soda, 3-1/2 cwt. | | | |
superphosphate | 53-3/8 | 53-1/4 | 53-1/4 |
275 lb. nitrate of soda, | | | |
mixed mineral manures. | 52-1/4 | 52-3/4 | 52-1/2 |
275 lb. nitrate of soda, | | | |
mixed mineral manures, | | |