10 CONTROL SERIES No. 51 



The 3.29 (4)-6-10 and the 4.11 (5)-4-5 grades showed the fifth and sixth largest 

 tonnage, the same as in the prevoius year. The 5.76 (7) -6-5 grade was advanced 

 from fourteenth place in 1928 to seventh place this season, and the 3.29 (4)-8-7 

 grade was advanced from ninth to eighth position. The 5.76 (7)-3-7, another 

 tobacco grade and a much more economical one to purchase than either the 4.11 

 (5)-3-5 or the 4.11 (5)-4-5 grade, was demoted from eighth to ninth place with a 

 reduction of 426 tons. 



It is evident that the consumption of the double-strength grades is in an ex- 

 perimental stage and this is likely to continue until an efTective, medium priced 

 machine is perfected for their proper distribution to the soil. The following 

 comparisons in tonnage are noted: the 8.23 (10)-16-14 grade was reduced from 

 fourteenth place in 1928, with 548 tons, to thirty-first place with only 177 tons; 

 the 6.58 (8)-16-8 was reduced from 89 tons to almost a negligible quantity this 

 season; the same may be said of the 6.58 (8)-16-20 grade, although a new grade 

 8 (9.73)-16-16, has evidently taken its place, 247 tons having been sold. The 

 total tonnage of grades that may be classed as double-strength or better is 683 for 

 this season as compared with 1,023 for the previous year. 



A further study of the tonnage tables gives the following information: 



1. Of the total tonnage sold, about 66.5 per cent was mixed fertilizer and 33.5 

 per cent unmixed materials. This is about the same proportion that existed in 

 1928. 



2. Of the 41,529 tons of mixed goods sold, 99.8 per cent were complete ferti- 

 lizers and .2 per cent were ammoniated superphosphates and superphosphates 

 with potash. 



3. Of the 41,452 tons of mixed complete fertilizers, about 83 per cent were high- 

 analysis and 17 per cent low-analysis (containing less than 14 per cent of available 

 plant food.) This lacks 10 per cent of being as good a showing for the high- 

 analysis goods as in 1928. It should be recalled that the adoption of nitrogen in 

 expressing the fertilizer grade (minimum guarantee) is largely responsible for this 

 increase in low-analysis tonnage. The ratio of nitrogen to ammonia is .82 to 1.00, 

 and on those grades where formerly the sum of the ammonia, available phosphoric 

 acid and potash just equalled 14 per cent, the adoption of the nitrogen reduces the 

 total of the three plant foods below 14 per cent and throws them into the low- 

 analysis group. 



4. Of the 34,538 tons of high-analysis complete fertilizers, about 82 percent 

 were furnished by 11 grades and 171 brands, and 89 per cent were furnished by 19 

 grades and 189 brands. 



5. There were 3,634 tons more of low-analysis complete fertilizers sold than 

 during the previous year. About 45 per cent of the tonnage of low-analysis com- 

 plete fertihzers was furnished by one grade, 4.11 (5)-3-5, comprising 16 brands; 

 62 per cent was furnished by two grades, comprising 20 brands; and 77 per cent 

 was furnished by four grades, comprising 23 brands. 



6. Only 75 tons of ammoniated superphosphates and superphosphates with 

 potash were sold. Only four grades and four brands contributed to this tonnage. 



7. The tonnage of the unmixed materials was distributed as follows: nitrogen 

 products, 37.5 per cent; phosphoric acid products, 27.2 per cent; potash products, 

 6.6 per cent; tankage, fish, bone, and wood as es, 18.4 per cent; animal manures, 

 10.3 per cent. 



