82 



THE ROTHAMSTED EXPERIMENTS. 



much grain as 1854; and in two — those with the highest 

 nitrogenous manuring (and both years were within the first 

 six when the larger amounts were applied), 1857 gave more 

 grain than 1854. The weight per bushel of the grain was 

 also higher in 1857 on all the plots where nitrogenous man- 

 ures were used. 



TABLE 25. — Produce of Barley in the two best Seasons, 1854 and 

 1857 ; in the worst Season, 1887 ; and the Average over Forty 

 Years, 1852-1891. 



Descriptions of manures ; 

 quantities per acre. 



DRESSED GRAIN PER ACRE, BUSHELS. 



lo 



7-2 

 4o 

 4a 



4aa 



Unmanured 



Farmyard manure 



Mixed mineral manure alone .... 



Mix. min. man. and 200 lb. am.-salts = 43 lb. N. 



Do. and 275 lb. sodium nitrate =43 



lb. N 



Do. and 1000 lb. rape -cake = 49 

 lb. N 



16J 



48$ 



m 



45£ 

 431 



WEIGHT PER BUSHEL OF DRESSED GRAIN, LB. 



STRAW PER ACRE, LB. 



lo 



7-2 

 40 

 4a 

 4oa 



4c 



Unmanured 



Farmyard manure 



Mixed mineral manure alone .... 



Mix. min. man. and 200 lb. am.-salts = 43 lb. N. 



Do. and 275 lb. sodium nitrate = 43 



lb. N 



Do. and 1000 lb. rape -cake =49 

 lb. N 



1044 

 3247 

 1279 

 2904 



3186 



TOTAL PRODUCE (GRAIN AND STRAW) PER ACRE, LB. 



lo 

 7-2 

 4o 

 4a 

 4aa 



4c 



Unmanured . 



Farmyard manure 



Mixed mineral manure alone .... 



Mix. min. man. and 200 lb. am.-salts = 43 lb. N. 



Do. and 275 lb. sodium nitrate =43 



lb. N 



Do. and 1000 lb. rape-cake=49 

 lb. N 



1976 

 6015 

 2530 

 5365 



5761 



5319 



Note.— Plot iaa, ammonium-salts = 86 lb. nitrogen first 6 years, =43 lb. next 10 years ; sodium 

 nitrate =43 lb. nitrogen last 24 years. Plot 4c, 2000 lb. rape-cake first 6 years, 1000 lb. since. 



