MANURE, YIELD AND SOLUBLE SALTS IN SOILS. 



35 



Contrary to what has occurred with the phosphates, but in 

 line with what was true of the lime, the four poorer soils have 

 yielded less sulphates than the stronger soils and, therefore, 

 have absorbed more from the manure, or have rendered it less 

 soluble. 



INFLUENCE OF MANURE UPON THE AMOUNTS OF WATER-SOLUBLE BICARBON- 

 ATES, CHLORINE AND SILICA IN SOILS. 



There are brought together in the next table the amounts of 

 HGO 3 , Cl and SiO^ v/hich were recovered from the soils to 

 which these large amounts of fresh manure had been added. 



Amounts of bicarbonates, chlorides and silica recovered from soils 

 treated with different amounts of manure. 



From the data of this table it appears that the amounts of 

 both chlorine and HCO 3 recovered from] the soils, after having 

 been in contact with the manure 65 days, is very nearly di- 

 rectly proportional to the amounts of manure added; while in 

 the case of the silica there is only a slight tendency to increase 

 the amounts which can be recovered from the soil with water 

 alone. 



Comparing the two groups of soil, as has been done with 

 other ingredients, the mean amounts recovered are as next 

 stated. 



