Navigation Links
Planting depth's effect on container-grown trees
Date:11/17/2011

BLACKSBURG, VA -- Many landscape trees are started in-ground, then sold as bare-root ''liners'' to producers who plant them in large containers to grow. To minimize wind damage and to facilitate transport from potting areas to growing beds, the liners are often buried deeper than necessary. This deep planting of liners results in "finished" container plants with deep structural roots, important foundations of root systems responsible for trees' health and stability. Deep structural roots are thought to contribute to physiological stresses resulting from oxygen deprivation.

J. Roger Harris and Susan D. Day from Virginia Polytechnic Institute and State University reported on their study of planting depth on pin oak and littleleaf linden trees in HortScience. "Green industry professionals are concerned about the increased number of landscape trees showing abnormally deep structural roots", Harris said. "Yet, the consequences of deep planting in production containers or the consequences of any adjustments made to planting depth at the time of transplant on growth in the landscape have not been reported for many species."

Harris and Day planted container-grown liners of pin oak and littleleaf linden trees in 50-L containers with the first main lateral roots (structural roots) at substrate-surface grade or 10 cm or 20 cm below grade (deep planting). Trees were grown in the 50-L containers for two growing seasons and in a simulated landscape for three additional seasons after transplanting, either with the top of the container substrate at soil level or with some roots and substrate removed so the original structural roots were just below the soil surface (remediated).

The experiments showed that deep planting pin oak -- but not littleleaf linden -- slowed growth during container production, but this effect did not continue after transplanting. Remediation of the 20-cm-deep pin oaks slowed growth during all three post-transplant years. Littleleaf linden remediation slowed growth for the first season after transplanting to a simulated landscape for 10-cm-deep trees and for the first two seasons for 20-cm-deep trees.

Evaluation of pin oak root systems three years after transplanting revealed vigorous growth of non-deflected adventitious roots that had formed on the trunks of deep trees; these roots appeared to be developing into main structural roots. No adventitious roots were present on littleleaf linden. Instead, deflected roots grew and produced deformed root systems on the linden trees.

"Remediating these species so as to expose root flares and to remove circling roots at transplanting may be more critical to ensure future health and stability of the tree. Thus, the resulting slower post-transplant growth is probably a justifiable expense", Harris said. "Our observations of littleleaf linden root system conditions three years after transplanting from containers suggest that root ball alteration at planting -- such as shaving or slicing outside edges or the use of special root pruning containersshould also be considered."

Harris and Day said their research suggests that nursery practices that minimize deep planting of liners in containers should be used as a general practice, regardless of tree species.


'/>"/>
Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert  

Related biology news :

1. Restoring forests and planting trees on farms can greatly improve food security
2. Digging in dirt, Arbor Day planting, may help build citizenship: UMD study
3. Fishy consequences of transplanting trout, salmon, whitefishes
4. Early cotton planting requires irrigation
5. Planting depth affects popular landscape tree
6. No consistent advantage for planting soybean early
7. Vidalia onions: Alternative to hand-transplanting proven effective
8. Up from the depths: How bacteria capture carbon in the twilight zone
9. Coral algae (symbiodinium) discovered in black corals at never seen before depths
10. Study suggests more fish than thought may thrive in the oceans depths
11. Juvenile bluefin tunas can dive to depths of more than 1000 meters
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Planting depth's effect on container-grown trees
(Date:3/7/2017)... March 7, 2017   HireVue , the leading ... companies identify the best talent, faster, today announced the ... Officer (CSO) and Diana Kucer as Chief ... seasoned executive team poised to drive continued growth in ... a year of record bookings in 2017. ...
(Date:3/2/2017)... 2017 Summary This report provides ... KGaA and its partnering interests and activities since 2010. ... Description The Partnering Deals and Alliance since 2010 report ... one of the world,s leading life sciences companies. ... to ensure inclusion of the most up to date ...
(Date:3/1/2017)... -- Aware, Inc. (NASDAQ: AWRE), a leading supplier of biometrics ... has resigned, effective March 3, 2017, as co-Chief ... Treasurer of Aware citing a desire to retire.  Mr. ... the Board of Directors of Aware. ... co-President, General Counsel has been named Chief Executive Officer, ...
Breaking Biology News(10 mins):
(Date:3/22/2017)... Mass. , March 22, 2017 Good ... that it has eclipsed the 130 million covered lives ... Blue Shield of Texas . With ... the Company continues to enjoy strong payor acceptance based ... its clinical programs and genetic counseling, its industry-leading customer ...
(Date:3/22/2017)...   iSpecimen ®, the marketplace for ... Service (DPS), a full-service anatomic pathology reference lab ... States , has joined a program offered by ... (DHIN) to make human biospecimens and associated data available ... announced in 2015 as a collaboration between iSpecimen and ...
(Date:3/22/2017)... 22, 2017 MarketNewsUpdates.com News Commentary  ... The traditional ... being pressured as of late due to the rise of ... has a dramatic impact on patient,s quality of life as ... for identifying new forms of opioid formulations that prevent abuse. ...
(Date:3/22/2017)... , March 22, 2017   Boston Biomedical , ... therapeutics designed to target cancer stemness pathways, today announced ... Andrews as Chief Executive Officer, effective April 24, ... Chiang J. Li , M.D., FACP, who has led ... ago. Under his leadership, Boston Biomedical has grown from ...
Breaking Biology Technology: