EXPERIMENTS AT ROTH AM ST ED 



107 



sulphate of magnesia, and 200 Ibs. common salt. The 

 ammonia salts, as in the other Rothamsted experiments, are a 

 mixture of equal parts sulphate and chloride. 



TABLE XXXV. 

 PRODUCE OF MANGELS VARIOUSLY MANURED AT ROTHAMSTED, 



AVERAGE OF SEVENTEEN YEARS, 1876-84, 1 886, 1888-94. 



* Average of sixteen years only. 



On the plots receiving no nitrogenous manure the average 

 produce amounts to about 5 tons of roots. The addition of 

 400 Ibs. of ammonia salts to the cinereal manures at once 

 raises the produce to over 16 tons. 



The necessity for a full supply of ash constituents, and 



