Hole | Backfill | 15 wks after planting | 57 wks after planting | ||||||
---|---|---|---|---|---|---|---|---|---|

15 cm^{1} | 30 cm | 15 cm | 60 cm | ||||||

BF | CL | BF | CL | BF | CL | BF | CL | ||

1.2X | unamended | 1.9 | 1.7 | 0.4 | 0.6 | 5.9 | 4.3 | 5.8 | 2.9 |

1.2X | amended | 4.4 | 0.5 | 1.2 | 0.3 | 7.2 | 3.4* | 4.5 | 2.4 |

1.2X | topsoil | 3.5 | 1.9 | 1.0 | 0.3 | 6.9 | 5.3 | 6.7 | 3.1* |

2X | unamended | 3.0 | 0.5 | 2.0 | 0.3 | 6.7 | 4.2* | 4.3 | 2.5 |

2X | amended | 3.1 | 1.8 | 0.8 | 0.5 | 5.9 | 3..3* | 5.7 | 3.7 |

2X | topsoil | 2.2 | 1.0 | 1.5 | 0.4 | 6.7 | 4.3 | 5.9 | 3.0 |

3X | unamended | 2.4 | 1.0 | 0.8 | 0.3 | 6.9 | 5.0 | 4.3 | 1.8* |

3X | amended | 1.9 | 1.8 | 1.4 | 0.3 | 5.3 | 4.2 | 3.8 | 2.2 |

3X | topsoil | 1.8 | 0.9 | 0.9 | 0.7 | 4.3 | 3.5 | 5.7 | 2.4* |

↵

^{1}Distance from the root ball↵*Significant difference between backfill soil and clay subsoil at the same location and sampling date at the 5 percent level using two-tailed T-test. There were no significant differences among the data in each column using Newman-Keuls test for mean separation at the 5 percent level.