EFFECT OF SULFATE OF AMMONIA ON SOIL. 



Table XL — Percentage Composition of Fixed Solids. 



The first difference noticed on studying Table X. is the larger amount 

 of soluble salts removed in the first percolate than in the subsequent por- 

 tions. That this difference is largely a matter of concentration is shown 

 by a comparison of the constituents as shown in Table XI. The varia- 

 tions between the two plots are those due to the different fertihzers used. 

 Plot 5 has more sulfates and magnesium and less chlorides removed than 

 plot 6. Since plot 5 received its apphcation of potash as low-grade sulfate 

 and plot 6 as muriate of potash, these differences were to be expected. 



The variations between the hmed and mihmed ends of the plots are 

 very similar. More calcium and less potash are removed from the limed 

 ends than from the unhmed. Traces of iron and aluminium were found 

 in all of the extracts, but showed no difference between the two plots or 

 between the limed and unhmed areas of the plots. 



