Juliano et al. - 1993 - Grain Quality Evaluation of World Rices

IRRI analyses confirmed Webb's physicochemical data (Appendix).
US rices had variable AC, low-intermediate GT, and soft-medium
GC (Table 6). Long-grained rice had the most variable quality. It had
predominantly intermediate AC, except for Century Patna 231, Toro,
L-202, Jojutla, Newrex, and Rexmont. Century Patna 231 and Toro had
low AC and the rest had high AC. These high-AC rices had harder
cooked rice than typical long-grained rice, but not as hard (8-10 kg/
7 cm 2 ) as IRGA-409- and IR8-type rices (12 kg/7 cm 2 ). California longgrained
rice L-202 had high AC and was grown in Spain as Thaibonnet.
Lemont is still the principal long-grained variety despite some processing
problems due partially to thick grains.
Grain length and width were correlated ( r = –0.75**, n = 56). Cooked
rice hardness correlated with cooked rice stickiness ( r = –0.64**, n = 17),
Amylograph setback ( r = 0.71**, n = 39) and consistency ( r = 0.74**), AC
( r = 0.64**, n = 55), GC ( r = –0.40**), and grain length ( r = 0.63**, n = 48)
and width ( r = –0.54**). Amylose content correlated with Amylograph
peak viscosity ( r = 0.57**, n = 47), setback ( r = 0.42**) and consistency
( r = 0.81**), grain width ( r = –0.71**, n = 56) and length ( r = 0.71*), GC
( r = –0.45**, n = 74), and alkali spreading value ( r = –0.42**, n = 87). Gel
consistency correlated with Amylograph consistency ( r = –0.63**,
n = 43) and setback ( r = –0.34*). Grain width also correlated with Amylograph
peak viscosity ( r = –0.44**, n = 33) and consistency ( r = –0.58**)
and alkali spreading value ( r = 0.63**, n = 56), whereas grain length
correlated with Amylograph setback ( r = 0.50**, n = 33) and consistency
( r = 0.70**) and alkali spreading value ( r = –0.42**, n = 87).
South America
R
ough rice production in South America was 17.1 million t
(3.5% of world total) of which 13.5 million t were available for
consumption in 1986-88 (FAO 1990a,b). Per capita milled rice
supply was 32 kg/yr in 1986-88 (FAO 1990a).
Argentina
A
rgentina’s annual rough rice production was 469,000 t in 1989
(FAO 1990b). Annual consumption per capita was estimated
as 3 kg in 1979-81 (FAO 1984) and about 4 kg in 1988 (RCMD
1989). Mean annual milled rice supply per capita in 1986-88 was 5.5 kg
(FAO 1990a).
44 Grain quality evaluation of world rices