FERTILIZERS AND MANURES. 



71 



concentrated by leaching until the article which is sold 

 in the United States produces as much as ninety-five per 

 cent, of nitrate of soda, or fifteen to sixteen per cent, of 

 nitrogen in an available form. 



In the Southern States we have a most excellent source 

 of nitrogen in cotton seed and cotton-seed meal, which 

 are probably the most important of nitrogen-producing 

 substances. The abundance of cotton seeds in the cotton 

 region supply a cheap origin for nitrogen for the Southern 

 gardeners, and the value of the seed is greatly enhanced 

 from the fact that the two other important plant foods 

 are found in them in quantities of about three per cent, 

 of the former and two per rout, of the latter. 



The animal origin of nitrogen is dried blood, fish scraps, 

 tankage and other waste products from slaughter-housos. 

 The blood is dried by steam, and yields from nine to 

 fifteen per cent, nitrogen. The fish scraps also supply 

 large quantities of phosphoric acid. 



Table Giving Approximate Amount of Nitrogen in Fertilizing Material.* 



*Geneva (N. Y.) Agricultural Experiment Station Bulletin No. 94. 

 page 315. 



