564 



Journal of Agricultural Research 



Vol. X, No. II 



equal parts of sodium chlorid and sodium sulphate, in the proportion 

 of I of soil to 5 of the solution and brought to equilibrium. The solutions 

 were then filtered and analyzed for calcium oxid. 



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Fig. 16. — Graphs showing the effect of sodium sulphate on the sohibility of calcium in soil. 



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Fig. 17. — Graphs showing the effect of mixtures of sodium chlorid and sodium sulphate on the solubility of 

 calcium in soil. 



The amounts of lime, calculated to calcium oxid soluble in the different 

 salts, are shown in Tables XXV, XXVI, XXVII, and XXVIII and are 

 brought together in figures 14, 15, 16, and 17. 



