MANURE, YIELD AND SOLUBLE SALTS IN SOILS. 



25 



POTASH ABSORBED FROM MANURE BY 8 SOILS. 



Influence of different amounts of stable manure upon the water- 

 soluble potash recovered with distilled water. 



The data of this table show, in a striking manner, that there 

 is a profound difference in the capacities of these 8 soils to 

 hold back potash from solution by the first 3-minute washing, 

 when applied to them, in the form of fresh cow manure and 

 left in contact, under like conditions, during 65 days, between 

 July 1 and September 11. The differences between the soils 

 are more clearly brought out by the diagram, Fig. 12, p. 26. 



The curve of 100-tons per acre shows a strong difference be- 

 tween the Hagerstown Loam and the two Janesville soils and 

 the other five members of the series, The application of 200- 

 tons of manure per acre places the two Janesville soils in one 

 group, the two Lancaster soils in another, and leaves the Nor- 

 folk Sandy Soil alone as having the smallest capacity for hold- 

 ing back potash. This relation was also found when! liquid 

 manure was applied, as cited in Bulletin "D," page 114. 



