RICE EXPERIMENTS IN CALIFORNIA. 
2i 
As two plans have been followed in the fertilizer experiments, it is 
thought best to discuss the results obtained under each plan separately 
and then to consider the combined results of both plans. 
EXPERIMENTS, 1914 TO 1916. 
The arrangement of the plats and the quantities of the various 
fertilizers used from 1914 to 1916 were as follows: 
("heck: no fertilizer. 
Acid phosphate. 350 pounds. 
Check: no fertilizer. 
Sulphate of ammonia, 100 pounds. 
Xitrate of soda, 100 pounds. 
Cottonseed meal, 280 pounds. 
Check: no fertilizer. 
Dried blood. 160 pounds. 
Sulphate of potash. 100 pounds. 
Acid phosphate, 350 pounds: sulphate of ammonia, 100 
pounds. 
Check: no fertilizer. 
Acid phosphate, 350 pounds; sulphate of potash, 100 pounds. 
Sulphate of ammonia, 100 pounds; sulphate of potash, 100 
pounds. 
Acid phosphate, 350 pounds; sulphate of ammonia, 100 
pounds; sulphate of potash, 100 pounds. 
Check: no fertilizer. 
Lime. 2,000 pounds. 
Manure, 2.000 pounds. 
Check: no fertilizer. 
Plats 101 and 201. 
102 and 202. 
103 and 203. 
104 and 204. 
105 and 205. 
106 and 206. 
107 and 207. 
108 and 208. 
109 and 209. 
110 and 210. 
111 and 211. 
112 and 212. 
113 and 213. 
114 and 214. 
115 and 215. 
116 and 216. 
117 and 217. 
118 and 218. 
The annual and average costs per ton of the fertilizers used during 
the six years, 1914 to 1919, are shown in Table 16. The average 
cost of fertilizers per acre when applied according to the foregoing 
outline is shown in column 3 of Table 17. 
The yields obtained from the fertilizer experiments during the 
3-year period from 1914 to 1916, inclusive, are shown in Table 18. 
These are the average yields each year from 2 tenth-acre plats, except 
the check, which represents the average yield of 12 tenth-acre plats 
each year. 
Table 16. — Annual and average prices per ton of fertilizers at San Francisco, Calif, 
during the 6-year period from 1914 to 1919, inclusive. 
Cost per ton. 
Average. 
Fertilizer. 
1914 
1915 
1916 
1917 
1918 
1919 
1914 
to 
1916. 
1917 
to 
1919. 
1914 
to 
1919. 
Manure (obtained locally) . . . 
Dried blood 
$4.00 
51.30 
65.50 
35.00 
44.00 
58.30 
12.25 
12.00 
$4.00 
51.50 
65.00 
35.00 
40.00 
56.03 
12.50 
12.00 
$4.00 
51.25 
$5.00 
70.00 
$6.00 
110. 00 
135.00 
$6.50 
120. 00 
120.00 
$4.00 
51.35 
65.50 
37.33 
40.33 
61.29 
12.52 
12.00 
$5.83 
100.00 
116.67 
$4.92 
Sulphate of ammonia 
66.00 
42.00 
37.00 
95.00 
91.08 
Nitrate of soda 
71.00 
90.00 
200.00 
2000 
15.00 
100.00 
200.00 
26.00 
15.00 
87.00 
200. 0^ 
21.17 
15.00 
63.67 
Sulphate of potash 
69. 55 200. 00 
130.65 
Acid phosphate 
Lime (obtained locally) 
12.80 
12.00 
17.50 
15.00 
L6.84 
The fertilizer experiments in 1914 were conducted on second-year 
land, in 1915 on third-year land, and in 1916 on fourth-year land. 
Each year the land was~ fall-plowed, and the following spring it was 
well prepared before seeding. 
