LIMESTONE 



171 



TABLE 26. ILLINOIS POT-CULTURE EXPERIMENTS 

 Magnesium Carbonate in Brown Silt Loam Prairie Soil 



SERIES F : MAGNESIUM CARBONATE AND CALCIUM SULFATE LEACHED 



1 Leached after 1904. 



carbonate, while most magnesian limestones contain a lower per- 

 centage, and since thorough harrowing or disking will mix the ma- 

 terial with at least 2 or 3 inches of soil, there is no likelihood of 

 any but beneficial effects from initial applications of 5 or 6 tons 

 to the acre, and subsequent applications of 2 tons per acre every 

 four or five years would probably never produce injury. On the 

 other hand, it is highly probable .that the element magnesium 



