COTTON CULTURE 73 



drying 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 artifi- 

 cially and ground for market. 



Meat Scrap or Tankage, etc., is slaughter-house refuse, 

 dried and ground. 



Nitrogenous Guanos are formed in dry regions. The 

 Peruvian guano is rich in nitrogen, containing seven per 

 cent or more, and usually contains seven to twelve per cent 

 phosphoric acid and about one per cent of potash. 



There are several inferior sources of nitrogen, such as 

 hair, hoof-meal, or horn-dust, leather scrap or meal, etc. 

 While all these materials contain much nitrogen, they de- 

 cay so slowly in the soil that they have a very uncertain 

 fertilizer value. 



TERMS USED IN STATING FERTILIZER ANALYSES 



Fertilizer dealers and the Experiment Station Bulle- 

 tins treat the different forms of fertilizer materials sep- 

 arately, and it is important that the farmer should be 

 familiar with these trade names and understand what 

 they mean. 



The following list contains most of the terms used in 

 stating fertilizer analyses: 



Potash is expressed as: (a) Potash, (6) Potash (actual), 

 (c) Potash S. (or Sul.), (d) Potash (soluble), (e) Potash 

 as Sulfate, (/) Potash equal (or equivalent) to Sulfate 

 of Potash, (g) Sulfate of Potash, (h) Potassium Oxide. 



