16 



The 323 analyses of complete fertilizers which ap- 



High and pear in the tables may be divided for convenience 



Low Grades of study into three grades. Those having a com- 



of mercial value of $18 or less per ton may be classed 



Fertilizer, as low grade; 83 such brands occur in the analyses. 



Those having a commercial value between $18 and 



$24 may be classed as medium grade; 122 such brands occur. 



Those having a commercial value of over $24 per ton may be 



classed as high grade; 118 such brands occur. 



GRADES OF FERTILIZER. 



What the above table shows: — 



1. That the percent of nitrogen and potash is much higher 

 in the high grade goods than in the medium or low grade. 



2. That with a 32 per cent advance in price over the low grade 

 fertilizer, the high grade furnishes more than 60 per cent increase 

 in available plant food. 



3. With about a 32 per cent, advance in price over the 

 low grade fertilizer, the high grade furnishes over 80 per cent, 

 increase in commercial value. 



4. A ton of the average high grade fertilizer furnishes about 

 43 lbs. more of nitrogen, hyi more of available phosphoric acid 

 and 99 more of actual potash than does a ton of the low grade 

 goods. 



5. The average high grade fertilizer with a 15>^ per cent 

 advance in price over the medium grade goods, furnishes about 

 22 per cent more plant food and about 35 X per cent increase in 

 commercial value. 



6. The medium grade goods cost about 15 per cent more than 

 the low grade goods and furnish over 35 per cent greater com- 

 mercial value. 



7. That the percentage difference in the low grade fertilizer 

 is more than double what it is in the high grade goods. 



