16 

 fertilizer. 



Bones in different forms are very prolific sources of 



phosphates,- as bone ash, it contains aoout 36 ^j as steaiiied 



bone it contains from 22 to 29^; as dissolved bone it contains 



from 15 to 17% phosphoric acid. Bone black, after having been 



used in sugar refininf is sold as a fertilizer and contains 



about 30% P , 

 2 5 



Potash Fertilizers, 



"^'ood ashes are an Important source of potash for the farm- 

 er. The per cent ranges all the way from 2.5 to 10.2. 



The following table gives the amount of potash in 

 10,000# of woods of different kinds; 



TThite oak 10.6 lbs. 



Red oak 14.0 lbs. 



Ash 15.0 lbs. 



Pine 0.8 lbs. 



Georgiapine 5.0 lbs. 



Dogwood 9.0 lbs. 



Stassfurt Salts- These combinations of potash, 

 sodium and magnesium salts are a valuable source of potash 

 fertilizer. 



Kainit, This mineral is mined at Stassfurt and is 

 nixed with gypsum, sal t^ potassium chloride and other bodies. 

 It contains about 12^ K and is one of the most important 

 of the Stassfurt Salts. 



Nutriate of potash or (K01) Contains from 35 to QOfo 

 Of potahs. It is a manufactured product, is readily soluble 

 and is a quick acting fertilizer. 



Sulphate of potash (K SO ) is prepared froiu some 



2 4 



