Agriculture Reference
In-Depth Information
Table 37
Correlations between grain fi eld and yield components.
Grains per panicle 1000grain wt (g) Grain yield (Kg/ha)
Panicles per plant
0.632
*
-0.139
0.497
Grains per panicle
1
-0.215
0.847
**
1000 grain weight
1
-0.199
Grain yield
1
Spikelet fertility percentage was reduced with increased
humidity also and with decreased temperature from 80 to 60%
(Chunhoi and Zongtan 1990). Environmental yield potential is
affected by climatic variation between sowing dates and years
in high altitude. It is less infl uenced in mid altitude. Shrestha
et al. (2012) has observed similar results in varying altitudes
of Madagascar (Table 38).
Table 38
Grain yield (t/ha) at different altitude and different duration of
genotype under cultivation of subsequent 2 years.
Grain yield (t/ha)
Grain yield(t/ha)
Early(1)
Early(2)
Late(1)
Late(2)
Mean
Mean of 10
High Altitude (1625 masl)
Genotypes 2.10
3.10
1.10
2.70
2.25
Medium Altitude (965masl)
-do-
4.50
4.30
4.90
4.40
3.70
Low Altitude (25 masl)
-do-
2.80
3.10
2.00
2.70
2.65
Yield stability and genotype x environmental interactions of
upland rice in altitudinal gradient of Madagascar suggests the
importance of genotype -environment interaction (Fig. 44).
