115 FERTILITY AND FERTILIZER HINTS 



is all the manufacturer guarantees and the maximum guarantee 

 of 12 per cent, is misleading and does not mean anything. It 

 seems to be common practice with the manufacturers to use both 

 the minimum and maximum guarantees. 



Guaranteed Chemical Analysis. No. 3. 



Per cent. 



Total phosphoric acid 10-12 



Available phosphoric acid 9-10 



Insoluble phosphoric acid 1-2 



Soluble phosphoric acid 6-8 



Equal to available bone phosphate 19.7-22 



Potash 3.5-5 



Nitrogen . . 0.82-1.65 



Ammonia 1-2 



Simplified this guarantee would read : 



Per cent. 



Available phosphoric acid 9.00 



Potash 3.5 



Nitrogen 0.82 



Guaranteed Chemical Analysls, No. 4. 



Per cent. 



Total bone phosphate 32.7-43.7 



Yielding total phosphoric acid 15-20 



Soluble bone phosphate 22-28 



Yielding soluble phosphoric acid 10-13 



Reverted bone phosphate 8.7-10.9 



Yielding reverted phosphoric acid 4-5 



Insoluble bone phosphate 2. 2-4.4 



Yielding insoluble phosphoric acid 1-2 



Simplified this would read : 



Soluble phosphoric acid 10.00 



Reverted phosphoric acid 4.00 



Insoluble pho.sphoric acid i .00 



Or we could state it as follows: 



Available phosphoric acid 14.00 



There are many manufacturers who put guarantees on their 

 brands that are not misleading and may be easily interpreted 

 by the ordinary person.* 



