REMOVAL OF LIME IN DRAINAGE WATERS 239 



soil taken at various intervals between 1865 and 1904 indicate 

 that on the unmanured plots the normal loss of calcium 

 carbonate in the drainage water amounts to about 1000 Ibs. 

 per acre. When ammonium-salts are used as a manure, the 

 loss is increased by the amount required to combine with the 

 combined acid in the manure. The calcium carbonate, how- 

 ever, which is required for nitrification, gets returned to the 

 soil by the growth of the plant itself, and by the decay of 

 calcium compounds in the crop residues. 



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