Agriculture Reference
In-Depth Information
Table 24 contd.
Location Planting Number
Variety
Yield range
cv
Time
of crops
(t/ha)
Filled Grain (%)
Los Banos
Jan-Dec
19
IR747-B2-6 83.0-95.2
4.0
Bangkhen
Jan-Dec
11
RD1
66.3-83.5
7.5
Jan-Dec
11
IR8
58.4-76.2
9.3
Chinat
Dec-July
8
RD3
91.7-96.1
1.7
Dec-July
8
RD4
80.0-96.5
8.2
Dec-July
8
C4-63
87.0-92.7
2.3
Dec-July
8
IR661-140
90.7-94.5
1.4
Hyderabad
July & Jan
2
IET1991
61.0 & 94.3
-
July & Jan
2
IET1039
59.5 & 82.1
-
Source: IRRI
According to AICRIP, India, grain size showed negatively
linear relationship with number in early duration group of
varieties. The decrease in grain number with increased size
was mainly due to the decreased number of grains per panicle.
The grain number recorded was of 25 x 10
3
which was lower in
comparison to the grain number recorded in medium duration
and late duration group varieties (Fig. 40). Grain size was found
to be not related to grain yield. Apparently increased grain
number at any given size would result in higher yields. Suitable
blending of grain size and number would lead to further
increases in yield potential. At a given grain size grain yields
differed suggesting greater scope for manipulations. Based on
the grain fi lling pattern in terms of growth rate and peak fi lling
periods, the varieties were grouped with peaks around 10, 15,
20 and 25 days after fl owering. The grain size was found not
to be related to grain fi lling periods and growth rate of grains
but on the climatic conditions (Rao et al. 1984).
