RICE EXPERIMENTS IN CALIFORNIA. 33 
inclusive. Wataribune produced an average yield of 3,731 pounds per 
acre on second and third year fallow land; and for the 3-year period 
from 1919 to 1921. inclusive. Wataribune produced an average yield 
of 2.548 pounds per acre on third and fourth year fallow land. 
Other varieties show similar decreases in yield on old land. There- 
fore, in comparing varieties it is necessary to compare them for the 
same years and when grown on land that has produced the same 
number of rice crops. 
The average yields for the 4-year period from 1918 to 1921, inclu- 
sive, on old land show that the short-grain midseason varieties rank 
first in yield and the short-grain late varieties second. The long- 
grain midseason Selection No. 113, the medium-grain midseason 
Early Prolific, the long-grain late Carolina Gold, and the short-gran, 
early Colusa, follow in order. 
The leading commercial variety at present is Early Wataribune. a 
short-grain midseason variety. Xext in importance are the short- 
grain early varieties. Colusa (C. I. Xo. 1600; and Onsen, while the 
short-grain late variety. Wataribune. is third. The Wataribune is 
grown on old land, the Early Wataribune and Caloro on new and 
old land, and Colusa (C. I. Xo. 1600) and Onsen largely on new land, 
as they do not yield well on old land unless it is very rich. There 
is a very small annual acreage devoted to the medium-grain Early 
Prolific and long-grain Edith varieties in California. 
Table 24. — Average agronomic data for 12 varieties of rice grown at the Biggs Rice Field 
Station, Biggs, Calif., during the S-year period from 1913 to 1920, inclusive. 
[Average date of first irrigation for all varieties, April 26: average date of emergence, May 14.] 
Date of- 
r T 
Type, group, and variety. \; 
Seeding. Heading. Ripening. H *JJ est " 
From 
first 
irri- 
Height 
gation 
(inches). 
to 
matu- 
ritv 
35 
135 
35 
154 
39 
161 
37 
176 
37 
L77 
31 
ISO 
39 
152 
43 
43 
43 
ISO 
44 
179 
40 
ISO 
Short grain: 
Early group— 
Spagnuolo (locally known as 
Italian rice) . . . * 15S5 Apr. 20 Aug. 5 Sept. 8 Sept. 9 
Colusa 1600 Apr. 18 Aug. 24 Sept. 27 Oct. 7 
Midseason group — 
Butte 1564 ...do Sept. 1 Oct. 4 Oct. 12 
Late group — 
Wataribune • 1561 ...do Sept. 9 Oct. 19 Oct. 22 
Omachi 1573 ...do Sept. 11 Oct. 20 Oct. 23 
Shinriki 1642 ...do Sept. 15 Oct. 23 ...do 
Medium grain: 
Earlv group — 
Pilit SI Apr. 20 Aug. 25 Sept. 25 Sept. 29 
Late group— 
FromCevlon 1241 Apr. 19 Sept. 12 Oct. 15 Oct. 19 
Do..' 125S Apr. 20 Sept. 11 ...do Oct. 20 
1 on g grain: 
Late group — 
Honduras 1643 Apr. IS Sept. 18 Oct. 23 Oct. 25 
Carolina White 1644 ...do Sept. 19 Oct. 22 Oct. 24 
Carolina Gold 1645 ...do do Oct. 23 Oct. 25 
Table 24 shows the average agronomic data for 12 varieties of rice 
grown at Biggs during the S-year period from 1913 to 1920. inclusive. 
Except for one or two varieties, the average date of sowing was 
