Root Collar

Root Collar

 

the transition zone between the root and the stem; it separates the hypocotyl of a plant from the primary root. At times this area is greatly swollen and clearly visible, particularly in seedlings; in mature plants the root collar is difficult to recognize. In agricultural practice the root collar is frequently mistakenly thought to be the thickened hypocotyl located above it or even the epicotyl. As a rule, the root collar is in the soil, and many secondary roots form in that zone.

References in periodicals archive ?
Since 22 July 2019, the tighter restrictions under the new NI plant health legislation apply to imported oak for planting where the stem is 8cms or more at 1.2 metres above the root collar.
'Picus Sonis Tomograph inspection is also recommended every two years on trees with a percentage of cavity or decay exceeding 15 per cent,' it said, adding that roots that showed signs of rotting should be made to undergo root collar excavation to reduce the potential for failure and prevent trees from threatening the safety of people.
Data collection was carried out every six months, considering the following parameters: survival (%), total height (m), root collar diameter (cm), crown length (m) and canopy projection area ([m.sup.2]).
Shoot height (SH) and root collar diameter (RCD) of both plant species was measured fortnightly, starting 30 days after germination.
Tree height and root collar diameter were measured and the prescncc of flower buds was identified.
At 60 after of experiment, the following biometric variables were determined: shoot height (H), root collar diameter (D), number of leaves (NL) and number of leaflets (NLf).
At the end of experiment, seedlings from all types of containers were measured for height and root collar diameter, whilst leachates were collected to determine nutrient concentrations of available phosphorus (P), potassium (K), ammonium and nitrate nitrogen (N) therein.
Analysis of Variance (ANOVA) was then performed on the transformed germination percentages, plant height, and root collar diameter and survival percentage using GenStat for Windows version 13 [16].
Dig down into the planting medium to find the root collar so you know how deep to plant the tree."
Two primary lateral roots were randomly selected and excavated to approximately 3 meters from the root collar. Roots were removed from trees and carefully dissected.
At the conclusion of the experiment (three months after germination), we measured shoot length, leaf number, and diameter at the root collar. We also calculated the area of the largest leaf on each plant based on the model obtained by Liv et al.
Pitch pine is a fire-adapted species with thick bark, epicormic branching, and the ability to resprout from the root collar when the main stem is killed (Burns and Honkala, 1990).