Agriculture Reference
In-Depth Information
Table 42
Mean duration (days) from transplanting to harvest for variety TDK1
and TDK5 in the 2001-2002 dry season at each location.
Location
Altitude
(m)
Mean Duration
(Days)
Grain yield
(t/ha)
TDK1
TDK5
TDK1
TDK5
Luang
Namtha
560
131
124
5.58
5.53
Xieng Khoung
560
147
129
3.81
3.93
Luang
Prabang
350
134
129
3.57
3.32
Sayatouli
290
107
97
3.48
2.91
Vientiane
171
108
101
4.08
4.01
Mean
125
116
4.10
3.94
LSD 5%
24
1.02
initiation were 28.7ºC and 10.9ºC for short duration (SD)
genotypes and 24.4 and 11ºC for long duration (LD) genotypes.
The genotypes encountered low temperature and low solar
radiation from vegetative to reproductive phases. A few
genotypes maintained better phenotypic acceptability. Most
of the selected genotypes experienced spikelet degeneration
symptoms. The genotypes (Group I, III and IV) producing
huge number of spikelets might be able to execute panicle
differentiation at the initial panicle development but at the
subsequent stage there must have some growth impairment
activities. In contrast, the genotypes (Group II and V) which
having lower number of spikelets m
-2
might be affected
primarily at the differentiation stage, then at the division
stage. The genotypes having short growth duration might
have the tolerance to withstand low minimum temperature
and those with long duration are appeared to have stress
avoidance mechanism (Nahar et al. 2009) (Fig. 46).
