IGa 



EXPERDIKNT STATION. 



[Jan. 



coin])arison of the yields on two of the Experiment Station 

 fields. The soil on the South Soil Test is considered a light 

 loam, while that on Field G is a heavy, silt loam. In both 

 fields there are plots to which no potash has been applied for 

 years, but which have received annual a])plications of nitrogen 

 and phosphoric acid. The rates of application of these plant- 

 food elements per acre are shown in the following table: — 



The increase due to the use of potash on these fields for 

 dift'erent crops over a long term of years is shown in the 

 following table: — 



' Iiiclude.-i; luiy and rowen. 



These two fields are scarcely more than 200 yards apart. 

 The soil survey map published by the Bureau of Soils, United 

 States Dei)artment of Agriculture, classifies them together. 

 Were the land still used as a farm instead of for experimental 

 purposes, the two areas would probably be thrown together in 

 the same field, and put to the same uses. Yet Ave have one 

 part where without potash corn cannot grow; anotlier part 

 where the use of liberal quantities of fertilizer potash makes 



