BULLETIN E. 



Amounts of salts recovered from manured and unmanured soils by 

 washing 11 times in distilled water. 



From this table it is seen that, so far as the three bases are 

 concerned, materially larger amounts of each have been recov- 

 ered from the manured soils than were recovered from those not 

 manured, under exactly the same treatment. It must be held 

 in mind that the bases have been demonstrated to be absorbed 

 more by soils than the negative radicles are; and further, that 

 the application of stable manure does bring into play the ab- 

 sorption forces whose tendency is to liberate certain ingredients 

 from soils while others are fixed. Notwithstanding the ten- 

 dencies to absorption, it is shown that under the conditions of 

 the treatment more potash, lime, magnesia and phosphoric acid 

 have been recovered from the soils to which they were added as 

 carried by the stable manure. 



Moreover, while it must be conceded that the cooking to 

 which these soils were, in a measure, subjected, during the dry- 

 ing, may have rendered potash, lime, magnesia and phosphoric 

 acid soluble from the manure when it would not otherwise have 

 been so, it is yet clear that, if rendered soluble, it was not again 

 fixed by the soils, although in contact with them, to such an 

 extent but that more was recovered from the manured than 

 from the unmanured soils. 



The excess amount of potash dissolved from the two ma- 

 nured soils was at the rate of 62.47 Ibs. per acre from the 

 Miami Loam! and 105.1 Ibs. from the Norfolk Sand. If the 

 potash is really left in a more soluble form in the Norfolk Sand 



