46 



BULLETIN 



in any other case. In other words, the untreated Pocoson soil 

 was nearly in prime condition for nitrification, so that the com- 

 bined effect of the manure and lime increased the nitrates 

 (NO 3 ) produced at the rate of only 101 pounds per acre in the 

 fifty days. 



The changes which occurred in the amounts of sulphates 

 (SO 4 ) recoverable by washing three minutes in distilled water 

 were also marked, and are given in the following table : 



Amounts oj sulphates, expressed as SO 4 , recoverable after about 



fifty days. 



From this table it is clear that, associated with the nitrifica- 

 tion, there has been a liberation of sulphates, apparently more 

 from the materials of the original soils than from the materials 

 added, and in larger amounts where the lime and manure are 

 added together. 



The changes in the amounts of phosphates have all been in 

 the opposite direction from those of either the nitrates or the 

 sulphates, as is shown in the following table: 



