COMPAKMS(^\ WIIFA' GKOWN IN IJOTATION 7.". 



from diagram Fii:. 10. wliicli sliow.s tlir avurage yield of grain on 

 the mimamired plot, on the dunged plot, and the mean ol" tlie 

 three plots completely manured with artitieial manures. 'I'hr 

 decline in the production of the dunged plot is the least markrd. 

 although consitlerable. 



Again, the Agdell field, which conuvs into harley everv 

 four years, has shown a decline in its yield of harley during 

 the last fifty years, wdiich is very similar to tliat of tli<> 

 continuous l)arley plots when the yields of each lidd an- 

 compared for the same years. Table XX XL shows the total 

 produce from the uiimanured and two of the completely 



Table XXXI. — Barlei/ r/nncu lontinuoiisJy, JFoos Fic'd, ami in fwr-roursr 

 rotation, Agdell Field. Convpari<ion of the Total Produce (Grain and 

 Straw) per acre in the years 1853, '57, '61, '65, '69, '73, '77, 'Hi, 'xr>. 

 '89, '93, '97, and 1901. 



manured plots in the Hoos field for the years when barley 

 was grown in the Agdell rotation Held, for which field the 

 crops on the unmanured and the mo.st highly iiiaiiuivd pl«»t 

 are also given. It will be seen that the barley crop grown 

 in rotation on the plot that is highly manured (a complete 

 manure is put on for tiie preceding Swede crop, which i.s 

 returned to the land) shows the same decline in yield as the 

 crop on completely manured plots growing barley continuously, 

 the average production ovei- the whole period and in succes.sive 



