226 



THE ROTHAMSTED EXPERIMENTS. 



TABLE 61. — Experiments on the Rotation op — Roots, Barley, Clover (or 

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

 32 years, 1852-1883. 



average amounts op nitrogen per acre per annum in the rotation crops, 

 compared with those in the crops grown continuously. 



SWEDISH TURNIPS. 



BARLEY. 



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



WHEAT. 



/"Rotation . 

 Grain < Continuous 



I Rotn. -for -cont 



( Rotation . 

 Straw < Continuous 



( Rotn.+or-cont 



/ Rotation . 

 Total ■< Continuous 



\ Rotn.+or-cont 



26.2 

 11.6 

 14.6 



10.4 

 5.4 

 5.0 



36.6 

 17.0 

 19.6 



23.7 

 11.6 



9.1 



5.4 



3.7 



32.8 

 17.0 



25.5 

 11.6 



13.9 



9.9 



5.4 



4.5 



35.4 



17.0 



18.4 



21.5 

 11.6 



8.8 



5.4 



27.2 

 13.9 



11.8 

 5.9 



2.8 | 5.9 



29.7 2} 39.0 

 17.0 19.8 



12.7 I 19.2 



25.4 

 13.9 



11.6_ 

 10.5 

 5.9 



35.9 

 19.8 



28.6 

 13.9 



12.3 

 5.9 



40.9 

 19.8 



28.2 

 13.9 



11.7 

 5.9 



39.9 

 19.8 



28.9 

 23.9 



13.2 

 10.1 



42.1 

 34.0 



30.1 

 23.9 



13.6 

 10.1 



43.7 

 34.0 



1 Calculated on average produce of 19 years, 1849-52 and 1856-70. 2 Probably crop too low owing to a dell. 



