altering taproot architecture of black tupelo (nyssa sylvatica) to a more fibrous root system

ALTERING TAPROOT ARCHITECTURE OF BLACK TUPELO (NYSSA SYLVATICA) TO

A MORE FIBROUS ROOT SYSTEM

Jimmy Klick, M.S. - Urban Forestry

Advisor: Dr. David J. Williams

Research Introduction

Objective

Research Introduction

Air-root pruning Small Containers

Research Introduction

Air-root pruning Small Containers Medium Containers

Research Introduction

Air-root pruning Small Containers Medium Containers

Auxin (K-IBA) 0 mg/L 1875 mg/L 3750 mg/L 7500 mg/L

Data Collected

1

3

Root Rating

Density Mass Coarse roots Circling roots Dead roots

Ordinal Logistic Model

Root Rating Why?

Ordinal values No transformation Determines likelihood of something occurring

How does it work? Odds Ratio

Determines how different one treatment is from another

Confidence intervals

Results: Root Rating Small Containerscd ab de de bc a bc ef f

Root Structure (Visual observations)

Fabric Container Plant Band Container

Results: Root Rating Medium Containers

b b

aa

Results: Auxin Root Rating a

Survival Rate

0 mg/L: 40% 1875 mg/L: 75% * 3750 mg/L: 65% * 7500 mg/L: 70% *

* significant difference (P = 0.025)

Conclusions

Small air-root pruning containers Black fabric and Plant Band

Medium air-root pruning containers Black fabric and green mesh

Auxin dips Transplant survivability

Future Studies

Media Transplant Auxin Ordinal Logistics Model

Acknowledgements

Advisor: Dr. David J. Williams Committee: Dr. Gary J. Kling and Dr. Jeffrey O.

Dawson Joseph Castro and Massimo Bionaz for help with

statistical analysis IR-4 Program for funding my research assistantship High Caliper Growing Systems, Lacebark Inc.,

Nursery Supplies Inc. for providing containers