. Bulletin of the Department of Agriculture. Agriculture; Agriculture. A SURVEY OF THE FERTILIZER IN' War Industries Board did not permit fertilizer manufacturers to have any nitrate of soda for mixing, and allowed them only enough for the manufacture of sulphuric acid, estimating roughly that their requirements of nitrate of soda amounted to about 1 per cent of their total sulphuric acid production. Most of the large fertilizer companies make their own acid phos- phate. Such firms are known as wet mixers, of whom 104 reported. Table III shows the quantity of material used in the
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. A SURVEY OF THE FERTILIZER IN' War Industries Board did not permit fertilizer manufacturers to have any nitrate of soda for mixing, and allowed them only enough for the manufacture of sulphuric acid, estimating roughly that their requirements of nitrate of soda amounted to about 1 per cent of their total sulphuric acid production. Most of the large fertilizer companies make their own acid phos- phate. Such firms are known as wet mixers, of whom 104 reported. Table III shows the quantity of material used in the manufacture of acid phosphate during 1917 and during the first six months of 1918. Table III.—-Material used in the production of acid phosphate. [2,000 pound tons.] January to June inclusive, 1918. Phosphate rock Steamed ground bone Raw ground bone Bone black Basic slag Other phosphatic materials Sulphuric acid 2,206,523 71,925 31,657 986 128 484 2,135,113 1,172,124 33,196 22,667 600 77 326 1,068,464 The companies used more than 2,200,000 tons of phosphate rock in the manufacture of acid phosphate during 1917, as compared with only 72,000 tons of steamed ground bone, and 32,000 tons of raw ground bone with small quantities of other phosphatic materials. The quantity of sulphuric acid used is approximately the same as that of the phosphorus-bearing materials. The production of phosphate rock was conducted by a number of the fertihzer companies and by other producers, mostly in Florida. Many of the big fertilizer companies are interested in the phosphate fields and are producing their own rock. The total production of phosphate rock amounted to 2,696,000 short tons, in 1918, as com- pared with 2,588,000 short tons The 1918 total is analyzed in Table IV. Table IY.—Phosphate rock produced in 1918. [2,00(>-pound tons.] ICind of rock. Short tons. Kind of rock. Short tons. 2,695,543 Tennessee: 377,511 52,777 51,387 Florida: 42,840 17, 736 2,141, 950
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