FERTILIZERS ON SANDY S(JIL — SMITH. 131 



Nitrates are more valuable than ammonia 



It depends upon the crops as to the proportion of the different 

 constituents to apj^ly. 



Further tests are required to show — 



What constituents the respective crops require ; 



The effect of continued application of the three different fer- 

 tilizers to the same soil ; 



To confirm or correct indications. 



Nothing has been said of the relative profit of these fertilizers, 

 as that has nothing to do with the problem before us. Some 

 of them were, however, extremely profitable. 



