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Caliper measurements on nursery stock trees describe the size of the plant material being sold. The caliper measurement for nursery stock trees measuring four inches or less is taken six inches above the soil. Once a nursery stock tree's caliper exceeds four inches, the tree is measured twelve inches above the soil.
The size and physiological character of stock vary with the length of growing period and with growing conditions. Until the technology of raising containerized nursery stock bourgeoned in the second half of the twentieth- century, bareroot planting stock classified by its age in years was the norm.
When stocking, a tree's basal area is measured. The basal area is a cross-sectional area of the stump taken about 4.5 feet (1.4 m) above the ground. [7] The equation for calculating the basal area of trees in a stand is Basal Area = 0.005454 DBH 2, where DBH is the diameter of the tree at the aforementioned measuring height. [7]
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Tubestock is the plural term for young plants which have been grown to the point where they are ready for either planting out in the field or potting on to larger pot sizes. Smaller, shallower pots (approx. 50 mm in diameter x 80 mm deep) are usually used to grow Tubestock in for the purpose of them being potted on to larger sizes.
They are grown in plastic trays with many "cells," each of which contains a single liner plant. Liners will typically range in size from a 36 cell tray up to a 288 cell tray. The most common size used in commercial nurseries is between 50 and 72 cells. The term "liner", is typically used for perennial, ornamental, and woody seedlings.