232 



THE ROTHAMSTED EXPERIMENTS. 



TABLE 62. — Experiments on the Rotation of — Roots, Barley, Clover (or 

 Beans), or Fallow, and Wheat ; in Agdell Field, Rothamsted. 8 

 courses, 32 years, 1852-1883. 



AVERAGE AMOUNTS OP MINERAL MATTER (ASH) PER ACRE PER ANNUM IN THE ROTA- 

 TION CROPS, COMPARED WITH THOSE IN THE CROPS GROWN CONTINUOUSLY. 



SWEDISH TURNIPS. 



I Rotation . 

 Roots -I Continuous 1 



1- Rotn. -for -cont 



f Rotation . 

 Leaves^ Continuous 1 . 



I Rotn. +or - cont 



( Rotation . 

 Total < Continuous 1 . 



i Rotn. -for -cont. 



lb. 



15.7 

 10.9 



22.4 

 16.8 



lb. 

 9 5 



10.9 



-1.4 



6.0 



5.9 



0.1 



15.5 



16.8 

 -1.3 



lb. 



13.8 



10.9 



lb. 



8.8 

 10.9 



6.6 

 5.9 



20.4 

 16.8 



14.72 

 16.8 



ib. 



74.1 

 _40 1 

 34.1 



17.9 

 16.4 



92.0 

 56.4 



lb. 

 71.3 

 40.0 

 31.3 

 20.4 

 16.4 

 4.0 

 91.7 

 56.4 

 35.3 



lb. 



82.5 

 40.0 



lb. 

 81.9 

 40.0 

 41.9 



19.2 

 16.4 



22.9 

 16.4 



101.7 

 56.4 



104.8 

 56.4 



lb. J lb. 

 167.8 171.2 

 100.3 100.3 



35.2 I 

 40.5 



41.9 

 40.5 



203.0 | 213.1 

 140.8 | 140.8 



lb. 

 182.4 

 100.3 



BARLEY. 



( Rotation . 

 Grain < Continuous . 



v Rotn. -for -cont 



("Rotation . 

 Straw -J Continuous 



\ Rotn. +or- cont 



( Rotation . 

 Total -c Continuous 



I Rotn. +or- cont 



34.8 

 21.5 



81.3 

 47.3 



35.9 

 21.5 



87.5 

 47.3 



123.4 

 68.8 



47.3 54.6 



38.0 26.5 I 27.5 



44.1 

 28.4 



96.9 

 55.6 



141.0 

 84.0 



45.9 

 28.4 



15.7 1 17.5 



99.8 

 55.6 



145.7 

 84.0 



50.7 

 58.8 



113.5 

 130.6 



164.2 



189.4 



51.5 

 58.8 



-7-3 

 116.8 

 130.6 



58.1 

 58.8 



168.3 

 189.4 

 -21.1 14.3 



BEANS (6 COURSES), CLOVER (2 COURSES), OR FALLOW. 



WHEAT. 



Average per acre, 19 years, 1849-52 and 1856-70. 



2 Probably crop too low owing to a dell. 



