EXPERIMENT STATION BULLETINS. 



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TABLE 1. — Reaction, soil class, potassium fixed from KCl, calcium, and chlorine in solution and calcium 

 and SiOz dissolved by 0.2 N HCl. Potassium added 0.391 gm. Chlorine added 0.3646 gm. 



(Results in grams per 100 grams of soil). 



(Non-carbonate soils.) 



(Carbonate soils.) 



Medium sand . 

 Sandy loam. . 

 Sandy loam. . 



Loam 



Sandy loam. . 



Loam 



Sandy loam. . 

 Sandy loam. . 



Loam 



Silt loam. . . . 

 Silt loam .... 



The reaction of the soils as indicated in Table 1 was determined by the 

 litmus paper test. It may be observed that some non-carbonate soils gave 

 an alkaline reaction and some carbonate soils gave an acid reaction. The 

 acid reaction of the carbonate soils may be explained on the basis that the 

 carbonates present were composed of coarse particles widely distributed 

 through the soil mass, a point observed during the testing operation for the 

 presence of carbonates. The alkalinity of the non-carbonate soils may be 

 due to the presence of carbonates in too small quantities to be observed 

 by the acid test or to alkaline silicates. The most important feature of 

 this table is the general agreement between the quantities of potassium 

 fixed and of calcium found in the solutions in all the soils and also between 

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