+--------------------------+--------------------
| Average per Annum, | Average per annum,
| 20 years, 1856-75 | 16 years, 1876-91
| (1st crops only). | (1st and 2d crops).
Manures per Acre per Annum. +--------+--------+--------+------+------+------
|10 years|10 years|20 years| 1st | 2d |
|1856-65.|1866-75.|1856-75.|crops.|crops.|Total.
-------------------------------+--------+--------+--------+------+------+------
| cwt. | cwt. | cwt. | cwt. | cwt. | cwt.
Unmanured continuously | 22-1/2 | 20 | 21-1/4 |18 | 8-1/2|26-1/2
3-1/2 cwt. superphosphate of | | | | | |
lime | 23-1/4 | 21-1/4 | 22-1/4 |18 | 9 |27-1/2
3-1/2 cwt. superphosphate of | | | | | |
lime, and 400 lb. ammonium | | | | | |
salts | 33-7/8 | 30-1/2 | 32-1/4 |30-3/4|10-1/2|41-1/4
400 lb. ammonium salts | 30-1/2 | 22 | 26-1/4 |18-1/4|10-1/8|27-3/8
275 lb. nitrate of soda, 3-1/2 | | | | | |
cwt. superphosphate, and | | | | | |
mixed mineral manure | 45-1/4 | 47-5/8 | 46-1/2 |41-1/8|12-1/8|53-1/4
275 lb. nitrate of soda | 34-1/4 | 33-1/2 | 33-7/8 |30-1/8|10 |40-1/8
-------------------------------+--------+--------+--------+------+------+------

TABLE XI.--EXPERIMENTS ON THE GROWTH OF POTATOES.

_Average of Five Seasons, 1876-80._[1]
----+-------------------------------+-------------------------------------------
| | PRODUCE PER ACRE--TUBERS.
Plot| MANURE PER ACRE PER ANNUM. |----------+----------+----------+----------
| | Good. | Small. | Diseased.| Total.
----+-------------------------------|----------+----------+----------+----------
Plot| |Tons cwt. |Tons cwt. |Tons cwt. |Tons cwt.
1 |Unmanured | 1 18 | 0 6-1/4| 0 2-1/4| 2 6-1/2
2 |Farmyard manure (14 tons) | 3 19-3/8| 0 7-5/8| 0 6-5/8| 4 13-5/8
3 |Farmyard manure (14 tons), and | | | |
| 3-1/2 cwt. superphosphate | 4 9-1/2|