-------+------------------------+-------+-------+-------+-------+-------- | | | | | 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 per million of water, and the Rhine eight parts per million. Some idea of what this amounts to per annum may be obtained by the statement that "the Rhine discharges daily 220 tons of saltpetre into the ocean, the river Seine 270, and the Nile 1100 tons."--(Storer's Agric. Chem., vol. i. p. 318.) NOTE VII. (p. 142). EXAMPLES OF DECREASE OF NITROGEN IN ROTHAMSTED SOILS.