----+----------------------------------+------+------+------+--------+------- | | | | | |Excess | | | | | |over Plot| Manuring. |1st 9 |2nd 9 |3rd 9 |Total 27|plots | |inches|inches|inches|inches |3 and 4 ----+----------------------------------+------+------+------+--------+------- | | lb. | lb. | lb. | lb. | lb. 3 |No manure, 38 years | 9.7 | 5.3 | 2.8 | 17.8 | 4 | " 30 " | 9.2 | 4.0 | 1.8 | 15.0 | 16a | " 17 " | 10.6 | 5.0 | 2.3 | 17.9 | 1.5 5a |Ash constituents, 30 years | 12.6 | 7.1 | 4.6 | 24.3 | 7.9 17a | " " 1 year | 10.3 | 7.5 | 3.4 | 21.2 | 4.8 6a | " and ammonium salts, 200 lb. | 16.5 | 7.5 | 4.7 | 28.7 | 12.3 7a | " " 400 " | 22.8 | 11.3 | 5.7 | 39.8 | 23.4 8a | " " 600 " | 21.1 | 13.9 | 7.8 | 42.8 | 26.4 9a |Ash and sodium nitrate, 550 " | 19.7 | 10.0 | 8.2 | 37.9 | 21.5 9b |Sodium nitrate, " " | 16.3 | 20.1 | 17.7 | 54.1 | 37.7 10a |Ammonium salts, 400 " | 14.2 | 11.9 | 7.3 | 33.4 | 17.0 11a |Superphosphate and ammonium salts,| | | | | | 400 lb. | 17.9 | 9.3 | 3.6 | 30.8 | 14.4 19 |Rape-cake, 1700 lb. | 14.1 | 13.0 | 7.1 | 34.2 | 17.8 2 |Farmyard manure, 14 tons--38 years| 30.0 | 15.4 | 6.8 | 52.2 | 35.8 ----+----------------------------------+------+------+------+--------+------- NITROGEN AS NITRATES IN BARLEY-SOILS VARIOUSLY MANURED, MARCH 1892, IN LB. PER ACRE (_Rothamsted Soils_).