112 



The Rothamsted Barley Experiments. 



Thus No. 1 gave the smallest, and No. 4 the largest, pro- 

 duce. Table XXIV. records the total produce (grain and 

 straw) in the three succeeding years during which barley was 

 grown, and for comparison there is introduced in the top line 

 the yield without manure in the second, third, and fourth of 

 the twenty years in which barley was continuously grown in 

 the Hoos Field. 



TABLE XXIV. YIELD OF BARLEY UNDER VARIOUS CONDITIONS. 



The average number of bushels of grain yielded during the 

 three years, 1853-55, was, on the unmanured plot in Hoos 

 Field, 31f ; and on Nos. 1, 2, 3, 4, 5, 6, in Barn Field, it was 

 20, 22, 25}, 25|, 39f , 47f bushels respectively. It appears, 

 then, that the mineral-manured turnips were followed by 

 three insignificant barley crops, much smaller than when 

 barley was grown after three immediately preceding corn 

 crops. In what constituent or constituents had the mineral- 

 manured turnips so exhausted the soil as to bring it into a 

 condition even far worse for the after- growth of barley than 



