4 i 6 INVESTIGATION BY CULTURE EXPERIMENTS 



TABLE 75. AGDELL ROTATION FIELD, ROTHAMSTED 

 Nitrogen in Surface 9 inches; Pounds per Acre 



Plots receiving Minerals, Rape Cake, and Ammonium Salts 



cited by a writer for the agricultural press in support of the teach- 

 ing that crop rotation will maintain the fertility of the soil. 



Probably no information could now be furnished by the Roth- 

 amsted Station that would be of greater interest to the agricul- 

 tural world than the changes that have occurred in the nitrogen 

 content of the Agdell plots since 1883. 



In Tables 76 and 77 are recorded the average composition of the 

 Agdell crops (except barley not reported) and the Park hay, re- 



