Root pruning and wrenching modified stock in the nursery by decreasing height, root collar diameter, shoot : root ratio, and bud size, but did not improve survival or growth after planting.
12.
Rhizomorphs grow close to the soil surface ( in the top 20 cm ) and invade new roots, or the root collar ( where the roots meet the stem ) of plants.
13.
When a tree is ailing and the trunk has that telltale telephone pole look, where the trunk does not flare out in a natural bole at the base, an arborist thinks, " Root collar ."
14.
Significant difference in height was found between open and sheltered plantations for black spruce but not for white spruce, and root collar diameter in sheltered plantations was significantly larger than in open plantations for black spruce but not for white spruce.
15.
The root collar and root system of the chestnut tree have some resistance to blight infection due to soil organisms adversely reacting to the fungus; consequently, a large number of small American chestnut trees still exist as shoots growing from existing root bases.
16.
Grossnickle et al . ( 1992 ) compared interior spruce root collar diameter, and dry weight increased at a greater rate in seedlings than in emblings during the first half of the first growing season, but thereafter shoot growth was similar among all plants.
