--------------------------------------+---------------- | Nitrogen in | 1st 9 inches. --------------------------------------+---------------- | Per cent. Old pasture | 0.250 Arable land in ordinary culture | 0.140 Wheat unmanured, 38 years | 0.105 Wheat and fallow unmanured, 31 years | 0.096 Barley unmanured, 30 years | 0.093 Turnips unmanured, 25 years | 0.085 --------------------------------------+---------------- MANURING, PRODUCE OF WHEAT, AND ALTERATION IN THE COMPOSITION OF THE SOIL IN BROADBALK FIELD, ROTHAMSTED, FROM 1865 TO 1881. -----+----------------------------------+----------------+---------------------- | | Average | Nitrogen per acre | | produce | in 1st 9 inches Plot.| Manures per acre, | per acre. | of soil. | annually applied, +-------+--------+------+-----+--------- | 16 years, 1865-81. | | | | | Gain or | |Dressed| Total |1865. |1881.| loss in | |grain. |produce.| | |16 years. -----+----------------------------------+-------+--------+------+-----+--------- | | bush. | lb. | lb. | lb. | lb. 3 |Unmanured |11-7/8 | 1715 | 2507 |2404 | -103 5_a_|Mixed mineral manure |12-3/4 | 1963 | 2574 |2328 | -246 10_a_|Ammonium salts, 400 lb. |17-7/8 | 2881 | 2548 |2471 | -77 11_1_|Ammonium salts, with | | | | | | superphosphate |23-1/4 | 3856 | 2693 |2676 | -17 7_a_|Ammonium salts, with mixed mineral| | | | | | manure | 28 | 4993 | 2829 |2908 | +79 9_a_|Nitrate of soda, 550 lb., and | | | | | | mixed mineral manure | 36 | 6949 | 2834 |2883 | +49 16_a_|Unmanured* |13-1/2 | 2194 | 2907 |2557 | -350 2 |Farmyard manure, 14 tons |31-1/2 | 5356 | 4329 |4502 | +173 -----+----------------------------------+-------+--------+------+-----+--------- * During 1852-64 received annually ammonium salts, 800 lb., with mixed mineral manure, and yielded an average product of 39-1/2 bushels of grain and 46-5/8 cwt. of straw. NOTE VIII. (p. 141). $1$2