FERTILIZERS 3* 



gen is as low as 1% the phosphoric acid will be 

 about 30%. If the nitrogen is as high as 5% the 

 phosphoric acid will be about 20%: and so with all 

 the simple materials. Their limits are known. 



It is quite possible with these limits known, to tell 

 from the guarantee given by a dealer, whether the 

 highest grade materials have been used in a given 

 mixture. Suppose a dealer guarantees, as found on 

 the bag, or tag : 



Nitrogen, 5% (from high grade blood) 

 Phosphoric acid, 10% (from steamed bone meal) 

 Potash (K 2 O), 2% (from the sulphate) 

 High grade blood contains at least 13% nitrogen 

 pure, or 260 Ibs. to the ton. To obtain the 5% or 

 100 Ibs. guaranteed will require $ of a ton of blood 

 or 769 Ibs. 



The phosphoric acid guaranteed is 10.% As 

 steamed bone meal may contain 30%, to obtain 

 10% will require ^ of a ton or 666.66 Ibs. 



Sulphate of potash usually runs 50% actual (K2O) 

 potash, so that the guarantee of 2% or 40 Ibs. could 

 be obtained from 80 Ibs. of sulphate. Altogether the 

 above guarantee of: 5% nitrogen, 



10% phosphoric acid, 



2% potash 

 can be obtained from : 



Blood, 769. Ibs. 



Steamed bone, 666.66 



Sulphate of potash, 80. ,, 



or, total material 1515. 66 Ibs. 



Make weight to one ton 484.34? ,, 



2000.00lbs. 



