TOBACCO CULTUR 1 - 67 



phosphoric acid compounds, or any two, or all three of 

 these forms of plant food The tables given at the end of 

 this chapter show the composition of the most commonly 

 used fertilizers. 



Nitrate of Soda v known as "Chili saltpetre/' is found 

 in large deposits which have been formed in the rainless 

 regions of Chili and Peru. 



Sulphate of Ammonia is formed from waste materials 

 produced in the manufacture of illuminating gas or coke. 



Whole Cotton Seed. Whole cotton seed is rather slow 

 in becoming available as fertilizer. By rotting to "kill" the 

 seed it is made more effective. The common practice is to 

 pile in large heaps and leave standing for several months. 

 This not only kills the seed, but also prevents the injurious 

 action sometimes observed from using raw seed as manure. 



Cotton Seed Meal is the product formed by removing 

 the oil from cotton seed by pressure, after which the mate- 

 rial is dried and ground. The hulls of the cotton seed also 

 possess considerable fertilizing value. 



Tobacco Stems are the refuse from tobacco factories. 



Dried Blood consists of blood obtained from slaughter- 

 ing animals ; it is prepared for market by coagulating, dry- 

 ing and grinding. The color varies from red to black. 



Dried Fish Scrap, consists of the meat and bone of fish 

 after the oil has been pressed out, it is dried artificially and 

 ground for market. 



Heat Scraps or Tankage, etc., are slaughter-house 

 refuse, dried and ground. 



