1 H E JOL-RiT‘rlL O F I S D C S T R I A L .I S D E -V GI ATE E RI S G C H E M I S 7’ R Y
July, 1915
Since t h e analyses of dried menhaden scrap m a d e in this Bureau show t h e average content of oil t o be approximately 6.99 per cent. it m a y be t a k e n t h a t each t o n of scrap would yield 1 3 9 . 8 0 lbs. of oil, which, a t 7 . 71 lbs. per gal.. is equivalent t o 18. 13 gals. per t o n . This a t 23 cents per gallon’ has a value of $ 4 . 1 7 per t o n . T h e cost of production being $3.16, t h e profit per t o n in oil recovered would be S1.00,or for t h e season’s production of 1000 tons, $1,000. If such a process were applied t o scrap from salmon which, i t is recalled, contains I 2 , 6 9 per cent oil, t h e profit would be $ 6 . 7 2 per t o n . on t h e basis of t h e same operating expenses as a b o r e a n d of 30 cents per gallon for oil. Since t h e o u t p u t of t h e indi7-idual plants on t h e Pacific Coast is n o t , on t h e average, 1,000tons per season, central receiving stations could be erected in t h e various sections a n d t h e degreasing done there. All t h e above estimates show t h a t t h e oil recovered would p a y for t h e process without a n y consideration being given t o t h e enhanced fertilizer value of t h e product. When, however. this feature is considered, i t is seen from t h e preceding pot experiments t h a t on t h e average t h e fertilizing qualities of t h e fish scrap are increased b y approximately 23 per cent. c 0 s c L u SI 0 3-s T h e fish waste of t h e Pacific Coast is very high in fertilizer value. I t averages higher t h a n menhaden i n i t s contents, as follows: M E N H A D E:X Nitrogen, 8 . 4 3 per c e n t ; phosphoric acid ( P , O j ) , 6 . 6 9 per c e n t ; a n d oil, 6 . 9 9 per cent. S A L M O XE,T C :. Xitrogen, 9 . 3 I per c e n t ; phosphoric 6 . 7 2 per c e n t ; a n d oil, 1 2 . 6 9 per cent. acid (P205), T h e menhaden industry is much larger a n d older, b u t there is no d o u b t b u t t h a t t h e salmon scrap industry will grow rapidly a n d soon equal t h e menhaden. This is especially t r u e because of t h e increasing ,dem a n d s for nitrogenous fertilizers a n d t h e availability of salmon cannery waste. T h e Aimerican Fertilizer Handbook for 1 9 1 4 ~ in reviewing t h e fish scrap fertilizer industry, gives t h e following conclusions: “ P r o b a b l y t h e most i m p o r t a n t feature t o t h e fish manure business during t h e past year was t h e unusually large number of new companies formed t o operate in this line. T h e industry, which was only a few years ago a comparatively uni m p o r t a n t one, is nom- one t h a t is attracting t h e a t t e n tion of financial men generally.” RUREhU
O F SOILS,
’WASHIKCTON,
D.
c.
NOTES ON THE COLORIMETRIC DETERMINATION OF PHOSPHORUS IN SOIL. EXTRACTS 13y C . E.
>f.INHATTAN . 1
. I . .1.C . S., 2 6 (1904). 1463.
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