Yale University New Haven Connecticut 06511

SCHOOL OF FORESTRY

ENVIRONMENTAL STUDIES

THE EFFECT OF ROOTS® ON ROOT REGENERATION OF BLACK

WALNUT ( Juglans nigra ) SEEDLINGS AFTER ROOT PRUNING AND

TRANS PLANTING IN GREENHOUSE CONDITIONS

 

Dr. Ricardo 0. Russo

Yale School of Forestry and Environmental Studies

Yale University, New Haven, Connecticut

 

INTRODUCTION

A greenhouse test was performed at the Greeley Laboratory at the Yale School of Forestry, New Haven, CT to evaluate the effects of ROOTS®, Root Growth Enhancer, a new root growth biostimulant on the root regeneration of black walnut seedlings following pruning and transplanting.

MATERIALS AND METHODS

Forty (40) three year old black walnut seedlings were obtained from the Patchaug State Nursery, Voluntown, CT in June 1989, and transported.to Yale-New Haven. Prior to transplant, approximately 70% of the root pruned and all lateral roots were removed. Seedlings were transplanted to 3/4 gallon pots, one seedling per got. Twenty (20) seedlings were treated with 200 ml of a 2% solution of ROOTS (1:50 water by volume), and twenty seedlings received only tap water, acting as the control. All seedlings survived. Seventy days after transplanting, all seedlings were harvested. Comparative evaluation was made of the stem arid root length, new leaf growth and dry weight, stein weight and new root dry weight. Data were analyzed with Statview II’for one factor analysis of variance for repeated measures.

RESULTS

Treated seedlings had 42% higher dry leaf weight values and 94% higher dry roots weight values than untreated control seedlings. No differences were shown in new stein growth.

seventy days after root pruning and transplanting.

N = 20; increment differences were significant (P < 0.01)

*ROOTS is a trademark of Soilizer Corporation