G46 



STATE BOARD OF AGRICULTURE. 



TABLE 10. — EFFECT OF A 1.3 INCH KAIN FALL, ON THE SOLUBLE SALT CONTENT OF 

 VARIOUS SOIL LAYERS IN DIFFERENT SOIL CLASSES. 



Depth of Samples. 



Siiil class. 



Freezing point depressions. 



Before a rainfall. 



Min. 



Vi to 

 6 in. 



6 to 

 12 in. 



After 1.3 in. rainfall. 



Min. 



M to 

 6 in. 



6 to 

 12 in. 



Miami sand, cultivated 



Miami sand, virgin 



Miami sandy loam, cultivated 



Miami sandy loam, virgin 



Clyde sandy loam, virgin 



Miami silt loam, cultivated 



Miami silt loam, virgin 



Muck, virgin 



Miami silt loam, cultivated 



Miami very fine sandy loam, culti- 

 vated 



043 

 .023 

 .255 

 .028 

 .023 

 .041 

 .018 

 .034 

 .014 



.101 



.001 

 .0U4 

 .005 

 .005 

 .009 

 008 

 .006 

 .005 

 .006 



.015 



.000 

 .001 



.004 

 Oil 

 .014 

 .007 

 .009 

 .002 



.010 



.008 

 .010 

 .020 

 .016 

 .028 

 .027 

 .012 

 .021 

 .011 



.018 



.013 

 .012 

 .029 

 .018 

 .016 

 .040 

 .027 

 .015 

 .015 



.013 



.012 

 .015 

 .011 

 .012 

 .011 

 .022 

 .015 

 .023 

 .010 



.018 



Moreover certain soil classes whose salt content was known were 

 irrigated with different amounts of distilled water. After the applica- 

 tions, they were sampled to different depths and the freezing point low- 

 erings again determined. Tj^pical results obtained from sandy loam are 

 given in table 11. 



TABLE 11.— EFFECT OF PERCOLATION UPON THE SOLUBLE SALTS IN SANDY LOAM 



SOIL. 



As was expected the soluble salts of light loams are greatly reduced 

 by a three-inch application of water and 12 inches reduces them to a 

 very low percentage. 



A heavy silt loam and a medium sand were also utilized. In studying 

 the former tests were made on a level and uniform area in a corn lield. 

 (The corn was two inches in height.) Three inches of water greatly 

 reduced the soluble salt content of the surface soil having little effect 

 upon the adjacent layer, but the twelve inches of water greatly reduced 

 the salt content in the upper nine inches of soil. 



