The experimental data giving the grams of nitrogen and per 

 cent of total nitrogen are found in Table VIII. 



Table VIII. Nitrogen distribution in Fargo clay loam. 



Grams nitrogen [ Per cent of total nitrogen 



II 



II Av. 



1 Entire sample lost during precipitation of bases. 



6. Fargo silt loam. Two 125 gram portions were hydrolyzed 

 for 48 hours with 500 cc. hydrochloric acid (sp. gr. 1.18). During 

 the first few hours large amounts of hydrogen chloride were 

 evolved. 



The resulting hydrolysates from the two flasks were com- 

 bined and diluted to 2 liters. After settling, a 1 liter portion was 

 syphoned off and analyzed by the usual method. Two 100 cc. por- 

 tions were used for the determination of total nitrogen in solu- 

 tion, and another portion of 200 cc. was used for determination 

 of the "Jodidi numbers." The nitrogen retained by the barium 

 phosphotungstate was 0.0091 gram. The solution containing the 

 basic nitrogen was made to 100 cc. volume and that containing 

 the nitrogen in the filtrate from the bases to 300 cc. volume. 



The experimental data showing grams of nitrogen and per 

 cent of total nitrogen are given in Table IX. 



Table IX. Nitrogen distribution in Fargo silt loam. 



Total N 



Ammonia N 



Insoluble humin N in soil 



Humin N pptd. by Ca(OH) 2 



Basic N 



Basic N set free as NH 3 by 50% KOH 



Basic N not set free as NH 3 by 50% KOH 



Amino N of bases 



Non-amino N of bases 



N in filtrate from bases 



Amino N in filtrate from bases 



Non-amino N in filtrate from bases 



Total N regained 



Grams 

 nitrogen 



Per cent 

 of total 

 nitrogen 



0.9238 

 0.2454 

 0.2118 

 0.0301 1 

 0.1119 

 0.0296 

 0.0823 

 0.0695 

 0.0424 

 0.3246 

 0.3015 

 0.0231 



26.56 



22.93 



3.26 



12.11 



3.20 



8.91 



7.52 



4.59 



35.14 



32.64 



2.50 



100.00 2 



By difference. 



Calculated. 



