Figure 5.

Total water use (a,c) and shoot dry weight (b,d) of IR64 and its INL, YTH304, under different water treatments in Exp. 1 (a,b) and under different water and hardpan bulk density (BD) treatments in Exp. 2 (c,d). The BD of the shallow soil layer was 1.25 g cm⁻³ while that of the hardpan layer was 1.50 g cm⁻³ in Exp. 1 and either 1.50 or 1.70 g cm⁻³ in Exp. 2. WW, well-watered and SMF, soil moisture fluctuation treatments. Error bars represent the standard deviation calculated from 3 replicates. Asterisk (*) indicates significant difference between the two genotypes at P < 0.05, by Student’s t-test.