26 
BULLETIN 1155, IT. s. DEPARTMENT OF AGRICULTURE. 
Table 19. — Annual and average yields of Wataribune rice obtained in fertilizer experi- 
ments at the Biggs Rice Field Station, Biggs, Calif, during the 3-year period from, 1917 
to 1919, inclusive. 
Fertilizer. 
Manure 
Sulphate of ammonia. 
Sulphate of ammonia. 
Acid phosphate 
Dried blood. 
Yields per acre when fertilizer was applied at different stages (pounds). 
A stage, plants 3 inches 
1917 1918 
1919 
4,720 3,150 
3.910 2,210 
Aver- 
age. 
B stage, first heads ap- C stage, 2 weeks after 
pearing. first heading. 
1917 
1918 
,240 
,200 
Sulphate of ammonia 
Sulphate of potash }4 
Acid phosphate 
Sulphate of ammonia \ ~ 
Sulphate of potash / > 
Sulphate of potash 
Acid phosphate .... 
Nitrate of soda 
,730 
,520 
,520 
3,500 1,600 
3,2S0 1,750 
Sulphate of potash. 
Acid phosphate — 
»,530 3,280 
Lime 3, 
No fertilizer l 3, 
39(i 
1,760 
2,706 
1,680 
1,850 
1,799 
3,943 4,040 3,020 
3,493 3,650; 3,560 
3,480 
3,310 
3,620 
3,460 
2,500 
2,873 3,560 3,260 
2,850 3,820 3,260 
3,640 
2,550 
3,477 
3,960 
3.720 2,100 3,340 
3, 820 
3,770 
1,930 
3,240 
3,690 
3,490 
3 1QO 
1,900 
3,093 
9 QKft 
3,720 
3 Ron 
2,830 3,480 
2,333' 3,5S0 
2,7321 
2,710 
1,390 
9 A H T - 1917 1918 
2, 830 3, 297 
1,950 3,053 3,740 2,930 
1,9S0 3,140 3,690 3, 
2,080 3,070 
1919 
1,530 
1,680 
1,820 3,043 3,500 2,340 1,470 
Aver- 
age. 
2,733 
2,817 
1,950 3,043; 3,530 2,470 
1,850 2,6S0 3,650 2,280 
1,800 2,873 3,690 3,140 
2,750 3,277 
1,450 
1,880 
2,547 
2,283 
3,790 3,230 
1,850 
1,830 
1,450 
2,100 
2,437 
2,617 
2,587 
2,760 
3,040 
i Average yields from 7 tenth-acre plats. 
The average increase in annual yield from applications of manure 
applied when the rice plants were 3 inches high was 1,211 pounds: 
sulphate of ammonia, 761 pounds; sulphate of ammonia and acid 
phosphate in combination, 745 pounds; dried blood, 608 pounds; 
and sulphate of ammonia, sulphate of potash, and acid phosphate 
in combination, 508 pounds per acre. Lime did not increase the 
average yield, but actually caused a reduction in yield of 399' pounds 
to the acre. 
The average price paid for rough rice during the years 1917 to 
1919 was $4.90 per 100 pounds. By deducting the cost of the ferti- 
lizers applied, with no charge for application, the increased yields 
from fertilizers show acre profits for this period ranging from 56 cents 
for sodium nitrate to $53.51 for manure. The application of lime 
and of sulphate of potash combined with acid phosphate caused 
annual losses of $34.55 and $8.90, respectively. 
The increased yield from the use of sulphate of ammonia was worth 
$31.46 per acre, acid phosphate and sulphate of ammonia combined, 
$26.98 per acre, and dried blood, $21.79 per acre. 
