84 



The absolute amounts of potash recovered from the 24 inches 

 of these eight soil types before and after capillary movement 

 had taken place are given in the next table, expressed in pounds 

 per acre. 



Amounts of potash recovered from 24 inches of soil after capillary 



movement. 



From this presentation of the data, it is to be observed that 

 in but one soil, the Janesville Loam, has the absorption of the 

 potash added to the soils been so great by them that less was 

 recovered after 20 or after 50 days of capillary movement than 

 was present in them, in water-soluble form, before the solution 

 was added. In three out of four of the poorer soils, more 

 potash was recovered after 20 days of capillary movement than 

 after 50 days; while with the four stronger soils the reverse 

 was the case. These relations are not unlike the case cited in 

 Bulletin "E," "Influence of Farm Yard Manure Upon Yield 

 and Upon the Water-Soluble Salts of Soils," p. 37, where sam- 

 ples of the Janesville Loam and of the Norfolk Sand were each 

 washed by percolating 6,000 c. c. of water through them! and the 

 Janesville Loam yielded 104.62 parts per million where the 

 Norfolk Sand yielded but 62.24, both soils having been pre- 

 viously treated alike with an application of manure at the rate 

 of 200 tons per acre. It must be admitted, however, that, so 



