*A* (*μ*mol m^{−2} s^{−1}) | 30a^{a} | 33a^{a} | 39a^{b} | 40a^{b} | 35b | 35b | 25a | 24a |

g (mol m^{−2} s^{−1}) | 0.25a^{a} | 0.28a^{a} | 0.26a^{b} | 0.28a^{b} | 0.22b | 0.23b | 0.16a | 0.16a |

*C*_{i}/*C*_{a} | 0.37a^{a} | 0.38a^{a} | 0.31a^{b} | 0.33a^{b} | 0.26a | 0.26a | 0.29a | 0.33b |

*V*_{p max} (*μ*mol m^{−2} s^{−1}) | – | – | 81a | 82a | – | – | – | – |

*V*_{c max} (*μ*mol m^{−2} s^{−1}) | – | – | 47a | 46a | – | – | – | – |

*V*_{p max}/*V*_{c max} | – | – | 1.72a | 1.78a | – | – | – | – |

Leaf N (mmol m^{−2}) | 119b | 70a | 115b | 88a | 108d | 81c | 47b | 37a |

Leaf N (mg g^{−1}) | 39b | 32a | 34b | 31a | 41c | 37b | 18a | 18a |

Stem N (mg g^{−1}) | – | – | 21b | 19a | – | – | – | – |

Root N (mg g^{−1}) | – | – | 16a | 19b | – | – | – | – |

Plant N (mg g^{−1}) | – | – | 24a | 23a | – | – | – | – |

Leaf mass per area (g m^{−2}) | 44b^{a} | 31a^{a} | 42b | 37a | 36c | 31b | 35c | 28a |

*A*/N (*μ*mol CO_{2} [mol N]^{−1} s^{−1}) | 313a | 525b | 351a | 478b | 299a | 388b | 445c | 611d |

NUE (g dry mass [g leaf N]^{−1}) | 67a | 111b | 95a | 116b | 65a | 88b | 191c | 218d |

Tiller no. (plant^{−1}) | – | – | – | – | 10b | 16c | 4a | 5a |

Plant dry mass (g plant^{−1}) | 9.2a^{a} | 14.6b^{a} | 9.9a^{b} | 10.7a^{b} | 4.4b | 4.5b | 1.5a | 1.3a |

Leaf mass fraction (% plant dry mass) | 39b^{a} | 33a^{a} | 35b^{b} | 31a^{b} | 41d | 35c | 32b | 28a |

Stem mass fraction (% plant dry mass) | 50a^{a} | 50a^{a} | 47a^{b} | 54b^{b} | 35c | 44d | 26a | 28a |

Root mass fraction (% plant dry mass) | 11a^{a} | 17b^{a} | 18b^{b} | 15a^{b} | 24b | 21a | 42c | 44c |