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Photosynthetic rate at 85 days after sowing (mid grain-filling stage) in 2016. CK, well-irrigated treatment; V6−8, water deficit during the 6–8-leaf stage; V9−12, water deficit during the 9–12-leaf stage; V13−T, water deficit from the 13-leaf stage to tasseling stage, R1−2, water deficit from silking stage to blister stage. Values with different letters are significantly different at P < 0.05.
