104 



CHEMICAL ANALYSIS OF SOIL 



filtrate of 500 c.c. each are evaporated to dryness and 

 ignited, to remove the citric acid and other organic 

 matter. The residues are extracted with hydrochloric 

 acid, again evaporated to dryness, and heated for some 

 time at 105° C, in order to render the silica insoluble. 

 In one portion is estimated the phosphoric acid, and in 

 the other the potash, by the methods described above 

 under the " Total Minerals." 



Statement of Results. 



The results of the chemical analysis of soil should be stated as 

 shown in the following typical example : — 



88. 



Alluvial Soil {Kent). 



