90 



BULLETIN 



may be recovered by washing with water. These observations 

 appear to be quite in harmony with observations on drainage 

 waters, which show that only small amounts of phosphoric acid, 

 relatively, escape from the soil with the water. 



FIG. 4. Showing distribution of water-soluble phosphates after capillary move- 

 ment. Solid line indicates results after 50 days ; broken line, results after 

 20 days. Values are means for 8 soil types. 



MOVEMENTS OF SULPHATES BY CAPILLARITY. 



The general tables show that, in the capillary movement of 

 the sulphates upward through the soils, they advanced much 

 as the lime and magnesia did, concentrating at the surface, but 

 not as. intensely as did either the chlorine or nitric acid. The 

 Norfolk Sandy Soil increased its content of SO 4 in the surface 

 inch nearlv 4-fold in the first 20 davs and nearly 8-fold in 50 



