Average nodule number/plant | 8^{a} | 12^{b} | 11^{b} | 11^{b} |

Average number of infections/plant | 168^{a} | 219^{b} | 289^{c} | 275^{c} |

Average number of infections/average total root length (cm)* | 7^{a} | 6^{a} | 7^{a} | 7^{a} |

Average infection zone length (mm) | 6.1^{a} | 7.7^{b} | 7.7^{b} | 8.5^{c} |

Average number of infection zones/plant | 3^{a} | 4^{b} | 5^{c} | 4^{b} |

Average number of infections/infection zone length (mm) | 27.5^{a} | 28.4^{a} | 37.5^{b} | 32.4^{b} |

Average tap root length (cm) | 6.2^{a} | 8.4^{a} | 10.7^{c} | 12.7^{c} |

Average lateral root length (cm) | 19.8^{a} | 26.7^{b} | 27.9^{b} | 24.3^{b} |

Average number of lateral roots/plant | 6^{a} | 9^{b} | 9^{b} | 12^{c} |