MANURE, YIELD AND SOLUBLE SALTS IN SOILS. 



27 



"forced the lime into solution." It must, however, be said 

 that the same soils which have absorbed least lime are the ones 

 which observation has abundantly proved contain most lime in 

 water-soluble form. 



Influence of different amounts of stable manure upon the quantity 

 of water-soluble lime recovered with distilled water. 



INFLUENCE OF MANURE ON THE WATER-SOLUBLE MAGNESIA IN 8 SOILS. 



When the results for the magnesia are brought together they 

 stand as given in the next table. 



In the case of the magnesia it will be observed that the influ- 

 ence of the manure upon the amounts dissolved has taken an 

 intermediate position between- that exerted upon the potash 

 and upon the lime. As was the case with the potash, less has 

 been recovered and, therefore, more absorbed by the four 

 stronger soils ; but the differences between the members of the 

 two groups of soils are not nearly so strongly marked. In the 

 case of the Janesville Loam, the manure had the effect of re- 

 ducing the quantity of magnesia below the amount recovered 

 from the untreated soil, unless it happened that in some way 

 the amount determined for the unmanured soil is too high. 



