Index
Description
Refs
2. Whole-growth-stage
tolerance
Test should be carried out in field with precipitation less than
50mm. Seeds of each germplasm in each treatment are sown in
single row of 1.5 m. The control field is irrigated (7 times) to
maintain the field soil moisture. In the treatment field, irrigation is
only applied before sowing to ensure the germination of seeds.
Plant height, number of branching, number of pods per plant and
yield per plant of 10 plants are determined upon harvest. Drought
tolerance coefficients of each trait are calculated. Average of
coefficients (RI) of all traits will be used to rank the germplasm into
5 levels.
Level 1: RI > 0.6500
Level 2: RI between 0.5000-0.6500
Level 3: RI between 0.3500-0.5000
Level 4: RI <0.3500
Level 5: Plant died or cannot reproduce
[29]
Table 3. Common parameters for assessing drought tolerance of soybean cultivars.
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