KICE CULTURE IN CALIFORNIA 29 
In the varietal experiments on larger plats Selections No. 1561-2, 
No. 1561-3, and No. 1561-4, mid-season short-grain strains, and Se- 
lections No. 114 and 115, late short-grain strains, all produced 
higher six-year average yields than Caloro, which has so emphati- 
cally proved its value in commercial production. Likewise, in the 
increase plats several selections and three named varieties produced 
higher five-year average acre yields than Caloro. It is interesting to 
note, however, that all of the mid-season varieties which exceeded 
Caloro in average acre yield are morphologically the same as Caloro. 
In other experiments, reported hereafter, Caloro is one of the leading 
varieties, with higher yields than the varieties apparently supe- 
rior in the experiments just discussed. These results at least indicate 
the general superiority of the type of which Caloro is representative 
for the general conditions of this section. 
VARIETIES FOLLOWING GREEN-MANURE CROPS IN 1924 
The land on which the green-manure crops were grown in 1923 was 
fallowed in 1922. In the spring of 1923 one variety of mung beans 
and four varieties of soy beans were sown in ridged rows about 33^ 
feet apart on a well-prepared seed bed. The beans were irrigated up 
and received a second irrigation on July 18. The mung beans 
grew to a height of about 5 feet and were matted on the ground 
when they were plowed under on November 1. The soy beans made 
a much poorer growth than the mung beans, although the Biloxi va- 
riety made a fairly good growth. The other varieties — Black Eye- 
brow, Easy Cook, and Peking — made a rather poor growth. The 
Biloxi variety was plowed under on November 1, and the other three 
varieties were double disked into the ground on* the same date. 
About an acre in all was sown to beans, and just west of this area, 
but separated from it by a dividing levee, was about one-half acre 
of land which was fallowed in 1922 and used in 1923 as a garden. 
The garden consisted mostly of tomatoes and melons grown in cul- 
tivated rows. The bean land and garden were kept free of weeds 
during the summer by cultivation and hand hoeing. The vines were 
removed from the garden in November, and an excellent volunteer 
stand of bur clover appeared. The bur clover made good growth 
during the winter and early spring months and stood about 15 inches 
high when it was plowed under late in March, 1924. The bean 
land also was shallow plowed in March and was double disked and 
dragged previous to seeding. A good seed bed was obtained on 
both the garden and the bean land. 
On April 29, 14 varieties of rice were sown in triplicate thirty- 
third-acre plats on this land. The varieties were irrigated the first 
time on April 30. In all there were 42 thirty-third-acre plats, and 
of this number 16 were located on bur-clover land and 26 were lo- 
cated on mung-bean and soy-bean land. The yields obtained from 
the 14 varieties are shown in Table 17. The yields on bur-clover 
land are for single thirty-third-acre plats, except those of Selection 
No. 138 and C. I. No. 1600, which are the average of two thirty-third- 
acre plats. On the mung-bean and soy-bean land the yields are for 
two thirty-third-acre plats, except for Selection No. 13S and C. I. 
No. 1600, which are for single thirty-third-acre plats. 
