4. Poor drainage is a major reason for death of new plants. If a pipe can drain to a lower point (3+% slope) a drainpipe in the bottom of the hole may be helpful. If a compacted layer or hardpan causes the drainage problem, drill a drain hole through the layer.
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7. Mycorrhizae more info : www.ohioline.osu.edu/hyg-fact/3000/3305
15. Pruning at planting slows root regeneration. Gibberellins produced in the root growing tips stimulate growth in the canopy. Auxins produced in the canopy growing tips stimulate root growth .