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Table 2

Influence of irrigation regimes on net assimilation rate (NAR), photosynthetic active radiation (PAR), water use efficiency (WUE) by total dry matter (TDM) and grain yield (GY), and radiation use efficiency (RUE) by TDM

TreatmentsNAR (g m−2 d−1)
PAR (MJ m−2)
WUE by TDM (g m−2 mm−1)
WUE by GY (g m−2 mm−1)
RUE-TDM (g MJ−1)
2015–162016–17Mean2015–162016–17Mean2015–162016–17Mean2015–162016–17Mean2015–162016–17Mean
I1 5.29 5.28 5.29B 600 598 599A 3.68 3.66 3.67D 1.19 1.17 1.18D 3.75 3.73 3.74B 
I2 5.20 5.18 5.19C 589 588 588B 5.19 5.21 5.20C 1.83 1.80 1.82B 3.95 3.93 3.94A 
I3 5.55 5.57 5.56A 582 581 582BC 6.37 6.42 6.39A 1.97 1.96 1.97A 3.67 3.67 3.67C 
I4 5.49 5.50 5.50A 577 576 577C 5.53 5.53 5.53B 1.63 1.64 1.63C 3.45 3.44 3.45D 
Mean 5.38 5.37  587 586  5.19 5.21  1.65 1.64  3.71 3.69  
LSD Y = ns, I = 0.0887, Y × I = ns Y = ns, I = 6.0814, Y × I = ns Y = ns, I = 0.0675, Y × I = ns Y = ns, I = 0.0331, Y × I = ns Y = ns, I = 0.0212, Y × I = ns 
TreatmentsNAR (g m−2 d−1)
PAR (MJ m−2)
WUE by TDM (g m−2 mm−1)
WUE by GY (g m−2 mm−1)
RUE-TDM (g MJ−1)
2015–162016–17Mean2015–162016–17Mean2015–162016–17Mean2015–162016–17Mean2015–162016–17Mean
I1 5.29 5.28 5.29B 600 598 599A 3.68 3.66 3.67D 1.19 1.17 1.18D 3.75 3.73 3.74B 
I2 5.20 5.18 5.19C 589 588 588B 5.19 5.21 5.20C 1.83 1.80 1.82B 3.95 3.93 3.94A 
I3 5.55 5.57 5.56A 582 581 582BC 6.37 6.42 6.39A 1.97 1.96 1.97A 3.67 3.67 3.67C 
I4 5.49 5.50 5.50A 577 576 577C 5.53 5.53 5.53B 1.63 1.64 1.63C 3.45 3.44 3.45D 
Mean 5.38 5.37  587 586  5.19 5.21  1.65 1.64  3.71 3.69  
LSD Y = ns, I = 0.0887, Y × I = ns Y = ns, I = 6.0814, Y × I = ns Y = ns, I = 0.0675, Y × I = ns Y = ns, I = 0.0331, Y × I = ns Y = ns, I = 0.0212, Y × I = ns 

Means sharing the same letter did not differ significantly at P = 0.05.

I1 = Full irrigation/Irrigation at all stages (control), I2=irrigation at 45 mm potential soil moisture deficit, I3 = irrigation at 60 mm potential soil moisture deficit, I4 = irrigation at 75 mm potential soil moisture deficit, Y = sowing year, I = irrigation treatments, Y × I = interaction, ns = non-significant.

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