2.3. Final evaluation of the ILs
In the 2010–2011 (Nov. 2010 to June 2011), all 189 BC2F4 and BC2F5
ILs obtained from the three selection schemes were evaluated
in replicated field experiments for their yield traits under
drought stress and normal irrigated conditions in Hainan.
Seeds of each IL were sown into a seeding tray on Nov. 25, and
30-day old seedlings of each IL were transplanted into a 3-row
plot with a spacing of 20 cm × 17 cm. The plots were arranged
in a random complete block design with two replications for
each IL in each water treatment. In the drought treatment, the
drought stress was started by draining the field at peak tillering
30 days after transplanting. But the climate of this season in
Hainan was not normal with a lower average temperature than
normal, resulting in prolonged growth duration. A one-time