46 



The experimental data giving the grams of nitrogen and pel 

 cent of total nitrogen will be found in Table XI. 



Table XL Nitrogen distribution in Hemp stead silt loam. 



| Grams nitrogen | Per cent of total nitrogen 

 | I~ II " I II | Av. 



1 Solution lost at this point. 



9. Prairie-covered loess. In Sample I, 250 grams were hy- 

 drolyzed in the presence of 250 cc. of constant boiling hydrochloric 

 acid for 48 hours. The hydrolysate on cooling was diluted to 1000 

 cc. and a 500 cc. portion was syphoned off and used for the an- 

 alysis. In Sample II, two 125 gram samples were hydrolyzed in 

 the same manner as outlined under Fargo silt loam (500 cc. con- 

 stant boiling hydrochloric acid to 125 grams soil). The dilution 

 and aliquot used for analysis were also the same. The nitrogen 

 retained by the barium phosphotungstate amounted to 0.0020 gram 

 in Sample I, and 0.0072 gram in Sample II. The solution con- 

 taining the bases was diluted to 100 cc. in both samples. 



The experimental data showing grams of nitrogen found and 

 per cent of total nitrogen are given in Table XII. 



Table XII. Nitrogen distribution in prairie-covered loess. 



| Grams nitrogen | Per cent of total nitrogen 



