MANURE, YIELD AND SOLUBLE SALTS IN SOILS. 



37 



In these percolation experiments the amounts of dry soil 

 used were, for the Janesville Loam 119.2 grams and for the 

 Norfolk Sand 154.3 grams. 



In the next table there are given the amounts of the differ- 

 ent ingredients recovered from these two soils by the percola- 

 tion method after the manure had been 206 days in contact 

 with them. 



Water-soluble salts recovered from heavily manured soils by per- 

 colation. 



There is thus, at this time, not only a large amount of each 

 ingredient recovered from the soils, except chlorine and silica, 

 but the differences between the amounts recovered from the 

 two soils are also large and in the usual direction, less coming 

 away from the poorer soil. 



This latter relation is not what the writer had anticipated 

 from the results which have already been given for these same 

 soils, obtained at an earlier date, 65 days after applying the 

 manure. It will be recalled that at that time the dried sam- 

 ples were treated 1 ini the usual manner, using 500 c. c. of water 

 to 100 grams of soil,' with vigorous stirring during 3 minutes. 

 Bringing the amounts recovered by the two treatments into 

 comparison, they stand as given in the next table. 



