EXPERIMENT STATION BULLETINS. 



331 



TABLE 7. — Fixation of polassiuin from KOIl and calcium from Ca(0H)2. 



Potassium added 0.3910 gm. 

 Calcium added (a) 0.045.5 gm. 

 Calcium added (b) 0.1069 gm. 



Soil aud reaction. 



M.S. al. 



M. S. ac. 



S. L. al. 



S. L. ac. 



St. L. al. 



St. L. ac. 



C. L. al. 



C. L. ac 



KOH treatments. 



Potas- 

 sium. 



0. 13.36 

 0.1226 

 0.2249 

 0.0931 

 . 2.560 

 0.1866 

 0.272.5 

 0.3020 



S102 



in 

 solution. 



0.0070 

 0.0075 

 . 0365 

 . 0245 

 0.0105 

 0.0115 

 0.0080 

 0.0095 



Calcium 



in 

 solution. 



. 005 

 . 004 

 . 007 

 . 004 

 . 005 

 . 007 

 0.007 

 0.006 



Ca(OH)2 treatments. 



Calcium 

 fixed (a). 



0.0346 

 0,0386 

 0.0376 

 0.0356 

 . 0336 

 0.03.56 

 . 0306 

 . 0356 



Calcium 

 fixed (b). 



. 0673 

 0.0792 

 0.0871 

 0.0792 

 . 0893 

 0.0811 

 0.0831 

 0.0792 



TABLE 8. — Soils treated with KOH, washed, then treated with CaCl-z or Ca{OH)i. 

 Calcium added as CaCh- 0.1703 gm. as Ca(OH)2 0.1069 gm. 



Soil and reaction. 



M. S. 

 M. S. 

 S. L. 

 S. L. 

 C. L. 

 C. s. 



al. 

 ac. 

 al. 

 ac. 

 al. 

 ac. 



CaCl2 



Calcium 

 fixed. 



. 0258 

 . 0277 



0.0673 

 0.0733 



Potassium 

 in solution. 



0.0532 

 0.0561 



0.1296 

 0.1.508 



Ca(OH)2 



Calcium 

 fixed. 



I'otassium 

 in solution. 



0.1010 

 0.0891 



0.0640 

 0.0.571 



Wt. calcium 



Wt. potassium. 



0.485 

 0.494 

 1.578 

 1.561 

 0.519 

 0.486 



BEPBOT OF HYDROlLrZING ISA'LTS 



Results of K3PO4 and Ca(H2P04)2 H2O Treatments 



In a foregoing section of this report is contained a discussion of the effects 

 of neutral salts on alkaline and acid soils. Neutral salts, at least those used 

 in this research, dissociate into ions and their principal effects have been 

 noted. Another class of salts containing members often used in soil treat- 

 ments have molecular dissociation as a distinct chemical property. A study 

 of the reactions between some of these salts and the series of soils previously 

 used was undertaken with results as shown in the following ta])le. Table 9 

 contains results obtained from treating the soils with K3PO4 and Ca(H2P04)2 

 H2O. 



