RICE CULTURE IN CALIFORNIA 
27 
Table 15. — Average agronomic data for six varieties of rice grown at the Biggs 
Rice Field Station during the seven-year period from 1918 to 1924, inclusive 
d 
d 
Date of- 
? 
bj 
w 
Sag 
Type, groups, and 
variety 
«-«-■ F Siof • 
Emer- 
gence 
First 
heading 
Full 
heading 
Ripening 
SS5 
~ a >. 
g cs a 
Z b£w 
— 
SHORT GRAIN 
Early group: 
Colusa 
Mid-season group: 
Caloro 
Late group: 
Wataribune 
MEDIUM GRAIN 
Mid-season group: 
Early Prolific 
1600 
1561-1 
1561 
Apr. 27 
Apr. 28 
Apr. 27 
...do.... 
May 2 
...do.... 
—do.... 
.do __.. 
May 17 
May 18 
May 17 
...do 
Aug. 9 
Aug. 22 
Aug. 30 
Aug. 20 
Aug. 18 
Aug. 29 
Aug. 23 
Sept. 1 
Sept. 8 
Sept. 9 
Sept. 3 
Sept. 21 
Sept. 22 
Oct. 5 
Oct. 16 
Oct. 11 
Oct. 5 
Oct. 19 
33 
33 
35 
35 
37 
38 
143 
156 
167 
162 
LONG GRAIN 
Mid-season group: 
Selection No. 113__ 
Late group: 
Honduras 
1643 
...do ..do 
do do 
...do.... 
...do 
156 
170 

/=-/G&7- //?#/GA770M TO Ms47~U/5/Tr (p*Kg> 
O SO /OO /SO ZOO 
s/*o.<?7- <ae^/A/ 
COLOSsf 
0?£0&0 
The earliest variety, Colusa (C. I. No. 1600), was ripe on the aver- 
age 143 days after the first irrigation, the average date of maturity 
being September 22. The Honduras variety required 170 days from 
the first irrigation to 
reach maturity, the av- 
erage ripening date of 
this variety being Oc- 
tober 19. Late Watari- 
bune, which was grown 
■extensivelv in Califor- 
nia from 1912 to 1917, 
is comparatively late. 
The average date of 
ripening for this variety 
was October 16, or 167 
days from first irriga- 
tion. In the vear 1924 \*.o**<s s^w 
Caloro was grown more 
extensively in Califor- 
nia than any other rice. 
The average date of rip- 
ening of Caloro was 
October 5, and the av- 
erage number of days from the first irrigation to maturity was 156 
days. Selection No. 113, a long-grain rice, also matures in 156 days, 
and Early Prolific is intermediate in maturity between Caloro and 
Wataribune, requiring 162 days from the first irrigation to reach 
maturity. The time elapsing from first irrigation to maturity for 
these varieties is shown graphically in Figure 7. 
Colusa is 13 days earlier than Caloro and 24 days earlier than 
Late Wataribune. Caloro is 11 days earlier than Late Wataribune 
and 14 days earlier than Honduras. The data in Table 15 were 
/YO,V£>V/5s*S 
Fig. 7.— Average time (in days) from first irrigation to maturity for 
five standard rice varieties grown at the Biggs Rice Field Station 
during the 7-year period from 1918 to 1924, inclu 
