INSPECTION OF COMMERCIAL FERTILIZERS 



41 



CHEMICALS AND RAW PRODUCTS 



Summary of Results of the Inspection of Fertilizer Simples and Raw 



Products. 



a Total potash. 



b In computing the pound cost of nitrogen, the value of the phosphoric acid and potash was not in- 

 cluded. The average commercial valuation of the phosphoric acid and potash, based on 1929 trade values, 

 ivould be: cottonseed meal, $2.93; linseed meal, $2.82; rapeseed meal, $2.04; castor pomace, $2.12. 



c Bought largely as a worm eradicator on golf greens and not for its plant food. 



d There was also present an average of 10.53'^'; of magnesium oxide. 



e Average tankage finer than 1/50 inch diameter, 47.66% ; coarser than 1/50 inch, 52.34%. ^ 



/ Average ground bone finer than 1/.50 inch diameter, 60.49%; coarser than 1 /.50 inch, 33.51% . 



!} Water insoluble potash, 4.50% ; calcium oxide, 13.18%; magnesium oxide, 0.41%; chlorine, 5.12%. 



A The value of the lime and magnesium oxide present in a ton of average wood ashes would be about 

 $5. This is not included in the valuation given here. The averages of the other determinations made were: 

 moisture, 12.07%; calcium oxide, 32.96%; insoluble earthy matter, 12.68%,. 



i Nitrogen valued at $0.80 per unit, a? it is much more active than in the other manures for which the 

 valuation is $5.75 por unit. 



