24 



From the above figures it will be seen that about 63 per cent of the complete ferti- 

 lizers could be classed as high analysis, and 37 as low analysis. In case of the am- 

 moniated superphosphates, about 35.7 per cent were high analysis and 64.3 per cent 

 low analysis. These are about the same proportions in both cases as in 1920. With 

 reference to the tonnage, however, it appears that there were nearly 6,700 tons less 

 of ammoniated superphosphates sold than during the previous season, although the 

 proportions in tonnage sold of the high-analysis and low-analysis goods were about 

 the same. There were about 1,000 tons more high-analysis complete fertilizers sold 

 than during 1920, and 3,549 tons less of the low-analysis complete fertilizers. 



The following table gives the average composition, selling price, commercial valua- 

 tion, and percentage difference in the high and low analysis complete fertilizers and 

 ammoniated superphosphates sold during the season, also the average pound cost of 

 each element of plant food from each source or grade : — 



The above table shows that the increase in cost of a pound of mineral nitrogen 

 has been about 6| cents; of organic nitrogen, 10| cents; of available phosphoric acid, 

 2 cents; and of potash, 2.8 cents, when derived from brands which furnished less 

 than 14 per cent of available plant food. 



EXPLANATION OF TABLES OF ANALYSES OF MIXED FERTILIZERS. 



In the tables headed "Fertilizer Mixtures showing a Commercial Shortage of $1 

 or more per. Ton," the detailed analyses are given. The column headed "Grade of 

 Fertilizer" may be explained as follows: a 4-8-6 grade means that the minimum 

 guarantee was 4 per cent ammonia, 8 per cent available phosphoric acid, and 6 per 

 cent water soluble potash; a 0-10-5 grade represents a mixture of superphosphate 

 with potash containing no nitrogen or ammonia, but with a guarantee of 10 per cent 

 of available phosphoric acid and 5 per cent of water soluble potash; and a 5-4-0 



