46 



The Rothamsted Wheat Experiments. 



9 bushels per acre. The addition of another 431b. of nitrogen 

 (plot 7) again increases the amount of wheat by between 

 8 and 9 bushels over the whole period, as compared with 

 plot 6, receiving only half as much nitrogen. The addition 



TABLE VIII. AMMONIA-SALTS COMPARED WITH NITRATE OF SODA. 

 Dressed Grain, per Acre bushels. 



Total Produce (Grain and Straiu) per Acre Ibs. 



of a third 431b. of nitrogen (plot 8) proved far less effective 

 than the previous additions, as, instead of being from 8 to 9 

 bushels, the average increase was only 3| bushels per acre ; 

 the average of the whole period being, for the 1291b. nitrogen. 



