Grain Yield Response Of Rice Cultivars Under Upland Condition
Keywords: Drought, drought tolerance, correlation, path analysis, susceptility index, relative yield
AbstractWith a view to understand the differences in yield among rice cultivars under drought, a comparative study was done using
53 rice genotypes including three local land races in both controlled and upland conditions. Ten yield components were
recorded in both the conditions. The correlation, path analysis and drought indices viz., relative yield (RY) and susceptibility
index (S) were worked out. The correlation studies revealed that the single plant yield (SPY) was significantly positively
correlated with number of leaves, number of tillers, number of productive tillers, number of primary branches per panicle,
number of secondary branches per panicle, number of grains per panicle, number of chaffs per panicle and boot leaf breadth
when evaluated under controlled irrigation condition. But none of the above traits had significant positive correlation with
SPY in upland condition. In the path analysis, it was found out that number of productive tillers per plant has a high positive
direct effect and most of other traits showed negligible or low direct effect in lowland condition, but in upland condition
none of the factors are having high direct effects towards SPY. From the S and RY, it was found that the local land races
and drought tolerant varieties MDU 5, TKM11 etc., performed well under upland condition.
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