>2 TOBACCO CULTURE. 



rianure Salt is another product of the Stassfurt mines 

 and contains a minimum of 20 per cent, actual potash. 



Sulphate of Potash=Magnesia is known also as Double 

 Manure Salt, or low grade sulphate of potash This mate- 

 rial comes from the German mines and contains 26 to 28 

 per cent of actual potash. It also contains 32 to 36 per 

 cent, of sulphate of magnesia. 



Carbonate ( f Potash=riagnesia contains about 1 8 per 

 cent, potash and 19 per cent, magnesia, both as carbonates. 

 It is practically free of chlorine. It is also a product of the 

 German potash mines. 



Wood Ashes contain more or less potash, which is pres- 

 ent chiefly in the form of carbonate. 



There are several very inferior sources of ammonia, such 

 as hair, ho.>f meal or horn-dust, leather scrap or meal, etc. 

 While all these materials contain much ammonia, they de- 

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

 tilizer value. These substances are from their very nature 

 slow to decompose, and when used with other materials, are 

 sure to cause disappointment from the lack of available am- 

 monia to accompany the potash and phosphoric acid. 



TERMS USED IN STATING FERTILIZER 



ANALYSES. 



Fertilizer dealers, and the Experiment Station Bulletins 

 treat the different forms of fertilizer materials separately 

 .and it is important that the farmer should be familiar with 

 ihese trade names, and understand what they mean. 



