Effects of Irrigation Schedules on Maize Yield and Water Use Efficiency under Future Climate Scenarios in Heilongjiang Province Based on the AquaCrop Model

Predicting the impact of future climate change on food security has important implications for sustainable production. The 26 meteorological stations’ data in study area are assembled from four global models under two representative concentration pathways (RCP4.5 and RCP8.5). maize yield, actual crop evapotranspiration (ETa), water use efficiency (WUE) were predicted by calibrated AquaCrop model deficit irrigation (the regulated (RDI) at jointing stage(W1), filling stage(W2)), full (W3) during three periods (2021–2040, 2041–2060, 2061–2080). result showed that yields W1, W2, W3 RCP4.5 2.8%, 2.9%, 2.5% lower than those RCP8.5, respectively. In yield was 1.9% 1.4% higher W1 Under RCP4.5, ETa 481.32 mm, 484.94 489.12 Moreover, significantly W2 RCP8.5 (p > 0.05). conclusion, stage is recommended when considering WUE.