22 
BULLETIN 1155, U. S. DEPARTMENT OF AGRICULTURE. 
Table 17.— Average cost per acre of fertilizers at San Francisco, Calif. ,in the 3-year periods 
from 1914 to 1916 and 1917 to 1919 and for the 6-year period from 1914 to 1919, inclusive. 
Fertilizer. 
Applied 
per acre 
(pounds). 
Average cost per acre. 
1914 to 1917 to 1914 to 
1916. 1919. 1919. 
1 
2 
3 
4 
5 
Acid phosphate 
350 
100 
120 
280 
160 
100 
350 
100 
350 
100 
100 
100 
350 
100 
100 
2,000 
2,000 
$2.19 
3.28 
2.02 
5.23 
4.11 
3.06 
} 5.47 
\ 5.25 
} 6.34 
t 8. 53 
12.00 
4.00 
$3.70 
5.83 
5.22 
$2.95 
Sulphate of ammonia 
4.55 
Nitrate of soda » 
3.62 
Cottonseed meal 
Dried blood 
8.00 
10.00 
9.53 
13. 70 
15.83 
19. 53 
15.00 
5.83 
6.05 
Sulphate of potash 
6.53 
Acid phosphate 
Sulphate of ammonia 
7.50 
Acid phosphate 
Sulphate of potash 
9.48 
Sulphate of ammonia 
Sulphate of potash 
11.08 
Acid phosphate 
Sulphate of ammonia 
14.03 
Sulphate of potash 
Lime (obtained locally) 
13.50 
Manure (obtained locally) 
4.92 
JApplied at the rate of 100 pounds from 1914 to 1916 and 120 pounds from 1917 to 1919. 
Table 18. — Annual and average yields of Wataribunerice obtained in the fertilizer experi- 
ments at the Biggs Rice Field Station, Biggs, Calif, in the 3-year period from 1914 to 
1916, inclusive, with average increase or decrease in yields and net values due to fertilizers. 
Fertilizer. 
Manure 
Sulphate of ammonia. 
Dried blood 
Cottonseed meal 
Nitrate of soda 
Acid phosphate 
Sulphate of ammonia. 
Sulphate of potash. 
Check 2 
Sulphate of potash . . . 
Sulphate of ammonia. 
Acid phosphate 
Acid phosphate 
Sulphate of potash. . . 
Sulphate of ammonia. 
Acid phosphate — 
Sulphate of potash. 
Lime 
Yield per acre (pounds). 
Gain or loss per 
acre. 
1914 
1915 
4,230 
4,375 
4,375 
4,610 
3,995 
5,000 
4,580 
4,485 
4, 335 
4,225 
3,810 
4,240 
4,270 
3,692 
4,025 
3,914 
3,850 
4,420 
3,795 
4,055 
3,755 
4,315 
2,990 
4,275 
3,130 
3,750 
1916 Average. Pounds 
4, 235 
3, 825 
3,905 
3,630 
3,165 
3,870 
4,488 
4,260 
4,255 
4,192 
3,795 
3,973 
3,200 3,832 
3,221 3,609 
3,580 3,883 
3, 415 3, 560 
3,085 3,322 
+ 879 
+651 
+646 
+ 583 
+364 
+ 223 
3,920 +311 
-49 
-287 
Net 
value. 1 
+$12. 70 
+9.09 
+8.16 
+5.85 
+1.51 
+1.45 
+1.18 
-.43 
-1.79 
-3.32 
-6.18 
-17.45 
1 The average price of rice from 1£14 to 1916 was $1.90 per 100 pounds. The figures in this column rep- 
resent the value of the increased production at this price, less the cost of fertilizers at San Francisco (Table 
17), but do not take into account the freight, the cost of application, or the extra cost of handling 
the increased crop. 
2 Average yield from 12 tenth-acre plats each year. 
