The effect of supplement irrigation on variability of DSR grain yield (t ha−1), (a) long duration variety (MTU7029), (b) short duration variety (Arize6129) under different sowing windows (S1-S10). Sowing window start dates are 1 May (S1), 8 May (S2), 15 May (S3), 22 May (S4), 29 May (S5), 5 June (S6), 12June (S7), 19 June (S8), 26 June (S9), 3 July (S10). Vertical shaded bars are 25th-75th percentiles; whisker caps are 10th and 90th percentiles and black dots 5th and 95th percentiles.