53 



Another interesting comparison was afforded by the 

 experiments of the Norfolk Chamber of Agriculture in 

 i&86 :;: with swedes. The following were the weights of 

 roots grown on the different plots named per acre on the 

 average of three farms : 



TABLE XXXI. 



The effect of potash with superphosphate and nitrate of 

 soda was rather greater than we have seen in other instances. 

 Sulphate of ammonia, however, whether with or without 

 potash, gav.e a larger weight of roots than nitrate. 



One more instance may be quoted as showing how the 

 relative effects of sulphate and nitrate vary according to 

 the manures with which they are used. The following 

 results were obtained as the average of two experiments 

 carried out in 1897 under the direction of the Yorkshire 

 College. The figures relating to rape dust are included for 

 comparison : 



TABLE XXXII. 



* "Journal of the Royal Agricultural Society of Bngland," 

 Vol. XXIII., S.S., Part I. 



