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

88 (FAO 1990a, IRRI 1991). About 30,000 ha were planted during 1982-
83 with Boake 1896 and Bg90-2 (Dalrymple 1986).
Preference is for good head rice, good volume expansion on cooking,
and a soft-medium, cooked-rice texture (A. A. Adewusi, WARDA,
1990, pers. commun.). Rice is usually cooked by boiling in water
(Adewusi et al 1989). Ivory Coast consumers prefer the long-grained
type because it cooks dry with the grains often remaining separate
(Firmin 1990). Fifteen samples had 6.1-8.6% protein (mean 7.5%).
Twenty-seven market samples obtained by WARDA had 5-8%
protein; 2 had low AC, 23 had intermediate AC, and 2 had high AC
(A.O. Adewusi, WARDA, 1990, pers. commun.). Seven were parboiled.
Market samples of local rices had 20-29% AC (RCMD 1989).
Twenty-four popular and farmers’ field samples (except IRAT 13 [low
AC]) had intermediate AC; low-intermediate GT; and medium, hard,
or soft GC (IITA 1985).
Ivory Coast rices had variable AC, mainly intermediate GT, and
variable GC (Table 8). IRAT rices and Chianan 8 had low AC; Palawan
and Tjempovelut, intermediate AC, and Bg141 and Bg187 (from Sri
Lanka), high AC (Appendix). Moroberekan and IAC164 upland rices
had intermediate AC similar to that of Philippine upland variety
Palawan. Only Dourado (and IRAT13 from Liberia) had long grains.
Low-AC rices and Moroberekan gave softer cooked rice than high-AC
rices Bg141, Bg187, and Zakpale 3. Grain length was mainly medium
rather than short or long. Grain was mainly medium-shaped.
Amylose content correlated significantly with Amylograph setback
( r = 0.86**, n = 21), peak viscosity ( r = –0.70**), and consistency
( r = 0.50*, n = 20), cooked rice hardness ( r = 0.75**, n = 21), GC
( r = –0.63**), and grain width ( r = –0.75**). Cooked rice hardness
correlated with Amylograph setback ( r = 0.65**) and peak viscosity
( r = –0.50*), and with grain width ( r = –0.54*). Grain width also
correlated with Amylograph peak viscosity ( r = 0.69**) and setback
( r = –0.75**). Amylograph peak viscosity and setback correlated as well
( r = –0.81**, n = 21), as did Amylograph consistency and set back
( r = –0.53*, n = 20).
Liberia
L
iberia
produced 280,000 t of rough rice in 1989 (FAO 1990b).
Annual per capita consumption of milled rice was 111 kg in
1979-81 (FAO 1984) and 105 kg in 1986-88 (FAO 1990a).
Africa 69