INSPECTION OF COMMERCIAL FERTILIZERS 

 Mixing Efficiency Table 



11 



Summary of Data on Acid and Basic Fertilizers 



* The net acidity is the total amount of calcium carbonate, expressed in tons, which would 

 be required to neutralize all the fertilizer tested. 



The average acidity is the average amount of calcium carbonate, expressed in pounds, which 

 would have to be added to each ton of mixed fertilizer to make neutral all of the fertilizer tested. 



AVERAGE ANALYSIS OF MIXED FERTILIZERS* 



♦Does not include fertilizer mixed for special orders. 



During the past three years, the average guarantee of the mixed fertilizers 

 has been higher each year than the preceding year, with the exception of the 

 average guaranteed available phosphoric acid which is slightly lower in 1937. 

 Nearly 2,000 tons more of the tobacco grades were sold in 1937 than during 

 the previous year; and this, most likely, is the principal reason for the some- 

 what lower average phosphoric acid both found and guaranteed for 1937. The 

 tobacco grades usually carry a phosphoric acid guarantee of about 3 percent. 



