In Bangladesh, wheat is sown after wet-season rice, using stored soil water plus supplemental irrigation on relatively permeable soils, on about 0.8 Mha, or 80% of the total wheat area, in regions where winter temperatures are relatively low. Grain yields are often small, especially when sowing is delayed, due to water deficit and heat stress during the reproductive stage. In southern NSW, Australia, about 20% of farmers regularly sow wheat immediately after rice. The number of irrigations ranges from zero (about 20% of farmers) to three (very few). The objective of this paper is to demonstrate the application of simulation models to estimate the optimum sowing date of wheat for northern Bangladesh and the trade-off between yield and watertables for southern NSW, Australia
