6 BULLETIN 798, U. S. DEPARTMeIsTT OF AGRICULTURE. 



importance. The production of but two of the other kinds amounted 

 to 50,000 tons. 



Table V shows the quantity of phosphate rock marketed in the 

 United States during the six months from January to June, 1918, 

 distinguishing between the amoimt that was used in the manufac- 

 ture of acid phosphate and the amount that was sold directly to 

 farmers for application to the soil. It also shows the quantity 

 exported and the stocks on hand at three given dates. 



Table V- — Phosphate rock marketed January-June, 1918, and stocks on hand Jan. 1, 

 1917 and 1918, and June 30, 1918. 



[2,000-pound tons.] 





Quantity marketed in 

 United States Janu- 

 ary-June, 1918. 



Quantity 

 exported 

 January- 



Jime, 



1918. 



Stocks on hand. 



Kind of rock. 



To acid 

 phosphate 

 manufac- 

 turers. 



To farmers 

 for direct 

 applica- 

 tion. 



Jan. 1, 

 1917. 



Jan. 1, 

 1918. 



June 30, 

 1918. 



Total 



805,735 



65,225 



27,664 



713,290 



974,564 



944,665 







Florida: 



Hard rock 







2,732 



1,002 



21,385 



2,545 



174,530 



326 



499,407 



39,020 



220,824 



370 



748,243 



5,121 



228,162 



Soft phosphate . . 



58 

 706,935 



93,854 



587 



22 



1,061 



3,211 



7 



6,559 

 45,203 



11,364 

 2,100 



170 





708, 780 

 7,547 



Tennessee: 



Brown rock 



Blue rock 









7 



6 



6 



Utah 



































1 









The great mass of the rock marketed during the period under dis- 

 cussion was in the form of Florida land pebble, of Which 774,000 

 tons were marketed during the first six months of 1918, and the 

 next most important quantity was of Tennessee brown rock. It 

 should be noted that most of the rock is sold to manufacturers of 

 acid phosphate, and that only small quantities, amounting to about 

 7 per cent of the total marketed in the United States, are sold to 

 farmers for direct application to the soil. The exports for the six 

 naonths of 1918 were very small, owing to the difficulty of obtaining 

 cargo space. A notable fact is that the accumulation of phosphate 

 rock in the hands of the mining companies is large. Very little 

 hard rock was produced during the first six months of 1918, and the 

 smaU quantity produced was exported, but a very considerable 

 amount of that rock, more than 200,000 tons, was in stock. The 

 stocks of the Florida land pebble rock were large and increased from 

 499,000 tons at the beginnuig of 1917 to 748,000 tons at the begin- 

 ning of 1918, but declined somewhat during the six months period, 

 January-June, 1918. 



