130 



CHEMISTRY OF FARM PRACTICE 



fornia claims shows a sodium nitrate content of about 

 9| per cent. The low niter content and poor transpor- 

 tation facilities have prevented the development of these 

 deposits. About 1,750,000 tons of nitrate of soda, con- 

 taining about 15| per cent nitrogen, are annually shipped 

 out of Chili, about one-tenth of which comes direct to 



FIG. 50. Drying floors and bagging of nitrate of soda. 



the United States. Some of the European supply is also 

 reshipped to this country. 



95. Calcium Nitrate. After many unsuccessful attempts 

 the compound, calcium nitrate, is now manufactured com- 

 mercially in this country and abroad from nitrogen of 

 the atmosphere by electrolytic means. In Notodden, Nor- 

 way, where the large water-power is utilized to produce 



