Water Regime

Photosynthetic WUE (µmol/m mol)

Net Photosynthesis (µmol m2 s−1)

Stomatal Conductance

(mmol m2 s−1)

Transpiration

(mmol m2 s−1)

Internal

Carbon (ppm)

Vapour Pressure Deficit (bars)

Cultivars (n = 16)

Moonlight

6.7 b

10.8b

116.3b

1.61b

223.2a

16.1

Agria

6.9 b

12.4b

142.9a

1.81a

206.7a

14.1

Moe Moe

8.6 a

14.4a

122.9b

1.67b

160.4b

15.8

Tutaekuri

9.4 a

14.2a

115.6b

1.51b

188.6b

17.5

Significant

p < 0.001

p < 0.0001

p < 0.05

p < 0.05

p < 0.01

Ns

Irrigation (n = 32)

60% ET

8.5

10.8b

123.2

1.52

170.4

17.1a

100% ET

9.2

12.6a

134.1

1.61

153.1

14.8b

Significant

Ns

p < 0.0001

Ns

Ns

Ns

p < 0.05

Nitrogen (32)

50 kg N ha1

9.2

10.9

118.4b

1.50

153.0

15.1

200 kg N ha1

8.5

12.4

138.9a

1.63

170.5

16.7

Significant

Ns

p < 0.0001

p < 0.01

Ns

Ns

Ns

Days after emergence (n = 64)

20

9.6a

17.7a

130.1a

1.84b

-

15.3

50

6.9b

12.8a

144.0a

2.08a

-

18.1

65

9.3a

12.3a

145.1a

1.52b

168.8

15.1

85

9.8a

9.1b

78.8b

1.15c

140.6

15.1

Significant

p < 0.01

p < 0.0001

p < 0.0001

p < 0.0001

NS

Ns

Interaction

Var.*DAE

Ns

p < 0.0001

Ns

Ns

Ns

Ns

Var.*N*IRR

Ns

p < 0.05

Ns

Ns

NS

Ns