Abstract
AbstractIn northwest India, spring maize water productivity can be increased with subsurface drip irrigation. Therefore, a field experiment was conducted in a split‐plot design for 2 years to assess the effect of three nitrogen levels (125 [N1], 100 [N2] and 75 [N3] kg N ha−1) in the main plots and seven irrigation regimes (six subsurface and one surface drip) in the subplots on water productivity of spring maize. Subsurface drip irrigation was applied at 100%, 80% and 60% cumulative pan evaporation on alternate days (I1, I3 and I5) and at 2‐day intervals (I2, I4 and I6) along with surface drip irrigation at 80% pan evaporation on alternate days (I7). The evapotranspiration (ET), transpiration (T), dry matter accumulation (DMA), leaf area index (LAI), root mass density (RMD), N uptake and grain yield were at par in N1 and N2 but significantly higher than in N3. T, DMA, LAI, RMD, grain N uptake and grain yield were at par in I1, I2, I3 and I7 but significantly higher than in I4, I5 and I6. The real water productivity was at par in N1I1, N1I3 and N2I3 but significantly higher than other interactive combinations. The CERES‐Maize model satisfactorily simulated crop biomass, grain yield, LAI, ET and transpiration.
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