190 



THE ROTHAMSTED EXPEEIMENTS. 



TABLE 55. — Nitrogen and Carbon in various Soils. 



Date of soil-sampling. 



In dry sifted soil. 



Nitro- 

 gen. 



Carbon. 



Carbon 

 tol 



nitrogen. 



Authority. 



ROTHAMSTED ARABLE AND GRS S SOILS. 



4-course rotation, 1848 and since; 

 fully manured for roots, each 



course 



'Farmyard manure, every 



year 

 Mineral and nitrogenous 

 manure 



Wheat, 

 1843-44, 

 and each- 

 year 

 since 



1 



J 



Mineral manure alone 3 



l 



Unmanured . . 3 



Barley, 1852, and each year since ; 

 mineral manures alone 



Roots, 1843-52; barley, 1853-55; 

 roots, 1856-69 ; mineral manures 

 alone 



Arable laid down to grass (10 acres), 

 spring, 1879 



Arable laid down to grass (Barn- 

 field), spring, 1874 



Arable laid down to grass (Apple- 

 tree field), spring, 1863 



Arable laid down to grass (Dr Gil- 

 bert's meadow), spring, 1858 



Arable laid down to grass (High- 

 field), spring (?), 1838 



Very old grass-land (The Park) 



1867, after wheat 

 1874, after clover 

 1883, after wheat 

 October 1865 . 



H 1881 . 



it 1865 . 



ti 1881 . 



h 1S65 . 



ii 1881 . 



n 1865 . 



n 1881 . 

 March 1868 



h 1882 



April 1870 

 February 1882 . 



November 1881 



January 1879 . 



September 1878 

 Feb. and March 1876 



Rothamsted. 



VARIOUS ARABLE SOILS IN GREAT BRITAIN. 



UNITED STATES AND CANADIAN PRAIRIE SOILS. 



laj 



(No. 1 

 No. 2 

 No. 3 

 No. 4 

 /Manitoba ; Portage 



Prairie— surface 

 N.W. Territory ; 



katchewan district— ] 

 surface J 



N.W. Territory; 40 miles -\ 

 Canada \ from Fort Ellice— sur- \ 

 face J 



( Niverville— first 12 \ 

 ,, . \ inches f 



M »£-' Brandon 

 toba j Selkirk 

 V V Winnipeg n 



-Voelcker. 



> Rothamsted. 



V Rothamsted. 



RUSSIAN SOILS. 



No. 1 — 12 inches 



No. 2— 8 m 



No. 3— 5 n 



No. 4—6 n 



No. 5—11 ■ 



No. 6—17 ii 



No. 7— 9 ii 



C. Schmidt. 



i Calculated on soil dried at 100° C. 



