ES IN BARLEY-SOILS VARIOUSLY MANURED, MARCH 1892,
IN LB. PER ACRE (_Rothamsted Soils_).

-------+------------------------+-------+-------+-------+-------+--------
| | | | | Total | Excess
| | 1st 9 | 2d 9 | 3d 9 | 27 | over
Plot. | Manuring. |inches.|inches.|inches.|inches.|plot 10.
-------+------------------------+-------+-------+-------+-------+--------
| | lb. | lb. | lb. | lb. | lb.
10 |No manure | 5.9 | 4.7 | 5.1 | 15.7 | -
20-40 |Ash constituents (mean) | 6.7 | 7.0 | 6.4 | 20.1 | 4.4
1 A |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
1 AA |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).

In connection with the loss by drainage of nitrogen in the form of
nitrates, it may be mentioned that the water of many of the famous
rivers contains large quantities of nitrates. Thus the water of the
Seine has been found to contain fifteen parts of nitrates pe